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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2018	Jul. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	MKSI
Entity Registrant Name	MKS INSTRUMENTS INC
Entity Central Index Key	0001049502
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		54,791,274

Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands

Jun. 30, 2018

Dec. 31, 2017

Current assets:

Cash and cash equivalents, including restricted cash

$ 427,431

^[1]

$ 333,887

^[2]

Short-term investments

203,686

209,434

Trade accounts receivable, net of allowance for doubtful accounts of $4,591 and $4,135 at June 30, 2018 and December 31, 2017, respectively

339,958

300,308

Inventories, net

384,929

339,081

Other current assets

61,720

53,543

Total current assets

1,417,724

1,236,253

Property, plant and equipment, net

174,054

171,782

Goodwill

588,718

591,047

Intangible assets, net

342,684

366,398

Long-term investments

10,476

10,655

Other assets

39,832

37,883

Total assets

2,573,488

2,414,018

Current liabilities:

Short-term debt

12,511

2,972

Accounts payable

87,699

82,518

Accrued compensation

75,637

96,147

Income taxes payable

17,294

21,398

Deferred revenue

10,729

12,842

Other current liabilities

78,201

73,945

Total current liabilities

282,071

289,822

Long-term debt, net

342,096

389,993

Non-current deferred taxes

64,752

61,571

Non-current accrued compensation

55,627

51,700

Other liabilities

27,504

32,025

Total liabilities

772,050

825,111

Commitments and contingencies (Note 19)

Stockholders' equity:

Preferred Stock, $0.01 par value per share, 2,000,000 shares authorized; none issued and outstanding

Common Stock, no par value, 200,000,000 shares authorized; 54,787,153 and 54,355,535 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively

113

Additional paid-in capital

793,384

789,644

Retained earnings

1,004,698

795,698

Accumulated other comprehensive income

3,243

3,452

Total stockholders' equity

1,801,438

1,588,907

Total liabilities and stockholders' equity

$ 2,573,488

$ 2,414,018

[1]	Restricted cash at the end of the period was $114 and $5,282 for the six months ended June 30, 2018 and 2017, respectively.
[2]	Restricted cash at the beginning of the period was $119 and $5,287 for the six months ended June 30, 2018 and 2017, respectively.

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4,591	$ 4,135
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	54,787,153	54,355,535
Common stock, shares outstanding	54,787,153	54,355,535

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Jun. 30, 2018

Jun. 30, 2017

Net revenues:

Net revenues

$ 573,140

$ 480,757

$ 1,127,415

$ 917,910

Cost of revenues

Cost of revenues

298,263

261,174

589,683

492,780

Gross profit

274,877

219,583

537,732

425,130

Research and development

36,504

33,680

71,361

66,962

Selling, general and administrative

76,559

71,979

159,508

146,199

Acquisition and integration costs

(1,168)

790

(1,168)

2,232

Restructuring

790

2,064

2,010

2,586

Environmental costs

1,000

Asset impairment

6,719

Amortization of intangible assets

10,901

11,468

22,091

23,969

Income from operations

151,291

92,883

282,930

176,463

Interest income

1,456

507

2,561

1,023

Interest expense

3,922

6,997

9,352

15,829

Gain on sale of business

74,856

Other expense, net

281

3,277

853

1,256

Income before income taxes

148,544

157,972

275,286

235,257

Provision for income taxes

25,682

37,532

47,303

49,757

Net income

122,862

120,440

227,983

185,500

Other comprehensive income:

Changes in value of financial instruments designated as cash flow hedges, net of tax expense (benefit)

^[1]

7,712

7,890

(2,429)

Foreign currency translation adjustments, net of tax of $0

(18,508)

17,729

(7,737)

22,264

Unrecognized pension gain, net of tax expense (benefit)

^[2]

123

(37)

205

Unrealized loss on investments, net of tax benefit

^[3]

(266)

(168)

(325)

(249)

Total comprehensive income

$ 111,848

$ 138,147

$ 227,774

$ 205,291

Net income per share:

Basic

$ 2.25

$ 2.22

$ 4.18

$ 3.44

Diluted

2.22

2.19

4.12

3.37

Cash dividends per common share

$ 0.20

$ 0.18

$ 0.38

$ 0.35

Weighted average common shares outstanding:

Basic

54,719

54,178

54,571

53,973

Diluted

55,274

55,001

55,280

54,979

Products [Member]

Net revenues:

Net revenues

$ 509,999

$ 426,317

$ 1,006,676

$ 814,255

Cost of revenues

Cost of revenues

266,890

230,706

528,211

436,540

Services [Member]

Net revenues:

Net revenues

63,141

54,440

120,739

103,655

Cost of revenues

Cost of revenues

$ 31,373

$ 30,468

$ 61,472

$ 56,240

[1]	Tax expense was $2,367 and $6 for the three months ended June 30, 2018 and 2017, respectively. Tax expense (benefit) was $2,255 and $(1,813) for the six months ended June 30, 2018 and 2017, respectively.
[2]	Tax expense was $12 and $34 for the three months ended June 30, 2018 and 2017, respectively. Tax (benefit) expense was $(24) and $153 for the six months ended June 30, 2018 and 2017, respectively.
[3]	Tax benefit was $22 and $46 for the three months ended June 30, 2018 and 2017, respectively. Tax benefit was $39 and $185 for the six months ended June 30, 2018 and 2017, respectively.

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges	$ 2,367	$ 6	$ 2,255	$ (1,813)
Tax on foreign currency translation adjustments	0	0	0	0
Tax benefit (expense) on unrecognized pension (loss) gain	12	34	(24)	153
Tax benefit on unrealized (loss) on investments	$ (22)	$ (46)	$ (39)	$ (185)

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands

6 Months Ended

Jun. 30, 2018

Jun. 30, 2017

Cash flows provided by operating activities:

Net income

$ 227,983

$ 185,500

Adjustments to reconcile net income to net cash provided by operating activities:

Depreciation and amortization

40,377

42,421

Amortization of debt issuance costs, original issue discount and soft call premium

2,887

3,742

Asset impairment

6,719

Gain on sale of business

(74,856)

Stock-based compensation

16,792

14,989

Provision for excess and obsolete inventory

10,292

11,002

Provision for bad debt

596

511

Deferred income taxes

1,170

7,798

Other

460

796

Changes in operating assets and liabilities:

Trade accounts receivable

(42,511)

(15,901)

Inventories

(59,529)

(34,056)

Income taxes

(11,416)

21,918

Other current and non-current assets

(4,317)

(2,779)

Accrued compensation

(15,933)

(161)

Other current and non-current liabilities

9,912

4,970

Accounts payable

5,604

2,860

Net cash provided by operating activities

182,367

175,473

Cash flows (used in) provided by investing activities:

Net proceeds from sale of business

72,509

Purchases of investments

(148,816)

(69,582)

Maturities of investments

90,734

85,234

Sales of investments

63,363

25,319

Purchases of property, plant and equipment

(21,818)

(9,739)

Net cash (used in) provided by investing activities

(16,537)

103,741

Cash flows used in financing activities:

Proceeds from short and long-term borrowings

36,989

8,637

Payments on short-term borrowings

(28,059)

(9,261)

Payments on long-term borrowings

(50,000)

(53,141)

(13,052)

(13,413)

Dividend payments to common stockholders

(20,750)

(18,903)

Net cash used in financing activities

(74,872)

(86,081)

Effect of exchange rate changes on cash and cash equivalents

2,586

1,069

Increase in cash and cash equivalents and restricted cash

93,544

194,202

Cash and cash equivalents, including restricted cash, at beginning of period

^[1]

333,887

233,910

Cash and cash equivalents, including restricted cash, at end of period

^[2]

$ 427,431

$ 428,112

[1]	Restricted cash at the beginning of the period was $119 and $5,287 for the six months ended June 30, 2018 and 2017, respectively.
[2]	Restricted cash at the end of the period was $114 and $5,282 for the six months ended June 30, 2018 and 2017, respectively.

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Statement of Cash Flows [Abstract]
Restricted cash, beginning balance	$ 119	$ 5,282	$ 5,287
Restricted cash, ending balance	$ 114	$ 119	$ 5,282

Basis of Presentation

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

1)	Basis of Presentation

The terms “MKS” and the “Company” refer to MKS Instruments, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The interim financial data as of June 30, 2018, and for the three and six months ended June 30, 2018 are unaudited; however, in the opinion of MKS, the interim data includes all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the results for the interim periods. The condensed consolidated balance sheet presented as of December 31, 2017 has been derived from the consolidated audited financial statements as of that date. The unaudited condensed consolidated financial statements presented herein have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and note disclosures required by United States generally accepted accounting principles (“U.S. GAAP”). The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the MKS Annual Report on Form 10-K for the year ended December 31, 2017 filed with the Securities and Exchange Commission on February 28, 2018.

The preparation of these unaudited condensed consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, management evaluates its estimates and judgments, including those related to revenue recognition, stock-based compensation, inventory, intangible assets, goodwill and other long-lived assets, warranty liabilities, pension liabilities, acquisition expenses, income taxes and investments. Management bases its estimates and judgments on historical experience and on various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

Reclassification of certain line items in prior period financial statements

The Company has historically recorded the revenue and related cost of revenue for the sale of its spare parts within Products in its Statements of Operations for the Vacuum & Analysis segment. The Company has now determined that these items are better presented within revenue and related cost of revenue within Services for the Vacuum & Analysis segment in its Statements of Operations to align with the current manner in which the Company operates its services business, and has elected to reclassify these amounts in previously issued financial statements as shown below. This change in presentation has no impact on total revenue or total cost of revenue.


	Three Months Ended June 30, 2017
	As previously reported		Adjustment			As reclassified
Net revenues:
Products	$	431,950	$	(5,633	)	$	426,317
Services		48,807		5,633			54,440

Total net revenues		480,757		—			480,757

Cost of revenues:
Cost of products		229,304		1,402			230,706
Cost of services		31,870		(1,402	)		30,468

Total cost of revenues	$	261,174	$	—		$	261,174


	Six Months Ended June 30, 2017
	As previously reported		Adjustment			As reclassified
Net revenues:
Products	$	824,872	$	(10,617	)	$	814,255
Services		93,038		10,617			103,655

Total net revenues		917,910		—			917,910

Cost of revenues:
Cost of products		434,364		2,176			436,540
Cost of services		58,416		(2,176	)		56,240

Total cost of revenues	$	492,780	$	—		$	492,780

Recently Issued Accounting Pronouncements

6 Months Ended

Jun. 30, 2018

Accounting Changes and Error Corrections [Abstract]

Recently Issued Accounting Pronouncements

2)	Recently Issued Accounting Pronouncements

In June 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-07, “Compensation-Stock Compensation (Topic 718): Improvements to Non-Employee Share-Based Payment Accounting.” This standard is intended to reduce cost and complexity and to improve financial reporting for share-based payments issued to nonemployees. This ASU expands the scope of Topic 718 Compensation-Stock Compensation, which currently only includes share-based payments issued to employees, to also include share-based payments issued to nonemployees for goods and services. The provisions of this ASU are effective for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. The Company does not expect adoption of this ASU to have a material impact on the Company’s consolidated financial statements.

In March 2018, the FASB issued ASU 2018-05, “Income Taxes (Topic 740).” This standard is an amendment that adopts the language of Securities and Exchange Commission Staff Accounting Bulletin No. 118 (“SAB 118”) and aims to address certain circumstances that may arise for registrants in accounting for the income tax effects of the Tax Cuts and Jobs Act (“the Act”) and to address any uncertainty or diversity of views in practice regarding the application of Topic 740 in situations where a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting under Topic 740 for certain income tax effects of the Act for the reporting period in which the Act was enacted. The provisions of this ASU were applied to the Company’s December 31, 2017 financial statements. The Company recorded provisional amounts with respect to the Act under SAB 118 at December 31, 2017 and June 30, 2018 and needs to complete additional analysis and receive additional guidance from the Internal Revenue Service with respect to provisions of the Act that affect the Company before the provisional determinations become final. Until the Company completes its analysis and receives additional guidance, the Company is not able to determine if the impact of ASU 2018-05 is material to the Company’s consolidated financial statements in any period.

In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220).” The amendments in this standard allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Act. The provisions of this ASU are effective for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. The Company does not expect adoption of this ASU to have a material impact on the Company’s consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815).” This standard better aligns an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The provisions of this ASU are effective for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. The Company does not expect adoption of this ASU to have a material impact on the Company’s consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09, “Compensation-Stock Compensation (Topic 718)-Scope of Modification Accounting.” This standard provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

In March 2017, the FASB issued ASU 2017-07, “Compensation-Retirement Benefits (Topic 715)-Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” This standard requires that an employer disaggregate the service cost component from the other components of net benefit cost. This standard also provides explicit guidance on how to present the service cost component and the other components of the net benefit cost in the income statement and allows only the service cost component of net benefit cost to be eligible for capitalization. The provisions of this ASU are effective for annual periods beginning after December 31, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805)-Clarifying the Definition of a Business.” This standard clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This standard also provides a more robust framework to use in determining when a set of assets and activities is a business. Because the current definition of a business is interpreted broadly and can be difficult to apply, stakeholders indicated that analyzing transactions is inefficient and costly and that the definition does not permit the use of reasonable judgment. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 230)-Restricted Cash,” an amendment to ASU 2016-15. This standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash and restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years and should be applied at the time of adoption of ASU 2016-15. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

In October 2016, the FASB issued ASU 2016-16, “Income Taxes (Topic 740)-Intra-Entity Transfer of Assets Other Than Inventory.” This standard requires that an entity recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs as opposed to when the assets have been sold to an outside party. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230)-Classification of Certain Cash Receipts and Cash Payments.” This standard addresses eight specific cash flow issues with the objective of addressing the diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows under Topic 230. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” This standard requires the recognition of lease assets and liabilities for all leases, with certain exceptions, on the balance sheet. In transition, lessees and lessors have the option to either apply the standard retrospectively through a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption or they can apply the new standard to comparative periods presented. This ASU is effective for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. The FASB issued additional updates to the new standard in Topic 842 relating to practical expedients for land easements (Update 2018-01 in January 2018). The Company has reviewed the requirements of this standard and has formulated a plan for implementation. The management team has communicated its approach to the Audit Committee and will provide regular updates as appropriate. The Company is currently accumulating details on the population of leases. The Company has selected a software repository to track all of its lease agreements and to assist in the reporting and disclosure requirements required by the standard. The Company will continue to assess and disclose the impact that this ASU will have on its consolidated financial statements, disclosures and related controls, when known.

In January 2016, the FASB issued ASU 2016-01, “Financial Instruments-Overall (Subtopic 825-10)-Recognition and Measurement of Financial Assets and Financial Liabilities.” This ASU provides guidance for the recognition, measurement, presentation, and disclosure of financial instruments. The new standard revises accounting related to equity investments and the presentation of certain fair value changes for financial assets and liabilities measured at fair value. Among other things, it amends the presentation and disclosure requirements of equity securities that do not result in consolidation and are not accounted for under the equity method. Changes in the fair value of these equity securities will be recognized directly in net income. This standard is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASC 606”). This ASU provides for a single comprehensive model to use in accounting for revenue arising from contracts with customers and has replaced most existing revenue recognition guidance in GAAP. This ASU is effective for fiscal years and interim periods within those years beginning after December 15, 2017. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. The Company used the modified retrospective method upon adoption in the first quarter of 2018. The FASB issued additional updates to the new revenue standard in Topic 606 relating to reporting revenue on a gross versus net basis (Update 2016-08 in March 2016), identifying performance obligations and licensing arrangements (Update 2016-10 in April 2016), narrow-scope improvements and practical expedients (Update 2016-12 in May 2016), technical corrections and improvements (Update 2016-20 in December 2016), and SEC Updates (Update 2017-13 in September 2017 and Update 2017-14 in November 2017). The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements as described further in Note 3.

Revenue from Contracts with Customers

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

3)	Revenue from Contracts with Customers

The Company adopted ASC 606 on January 1, 2018 using the modified retrospective method for all contracts not completed as of the date of adoption. The reported results for the six months ended June 30, 2018 reflect the application of ASC 606 guidance while the reported results for 2017 were prepared under the guidance of Accounting Standards Codification 605, Revenue Recognition (ASC 605).

The Company has recorded a net increase to opening retained earnings of $1,809 as of January 1, 2018 due to the cumulative impact of adopting ASC 606, with the impact primarily related to its service business and certain custom products. The impact to revenue for the quarter ended June 30, 2018 was immaterial as a result of applying ASC 606.

The adoption of ASC 606 represents a change in accounting principle that will more closely align revenue recognition with the delivery of the Company’s goods or services and will provide financial statement readers with enhanced disclosures. To achieve this core principle, the Company applies the following five steps:

•

Identify the contract with a customer

•

Identify the performance obligations in the contract

•

Determine the transaction price

•

Allocate the transaction price to performance obligations in the contract

•

Recognize revenue when or as the Company satisfies a performance obligation

Revenue under ASC 606 is recognized when or as obligations under the terms of a contract with the Company’s customer has been satisfied and control has transferred to the customer. The majority of the Company’s performance obligations, and associated revenue, are transferred to customers at a point in time, generally upon shipment of a product to the customer or receipt of the product by the customer and without significant judgments. Installation services are not significant and are usually completed in a short period of time (normally less than two weeks) and therefore, recorded at a point in time when the installation services are completed, rather than over time as they are not material. Extended warranty, service contracts, and repair services, which are transferred to the customer over time, are recorded as revenue as the services are performed. For repair services, the Company makes an accrual at quarter end based upon historical repair times within its product groups to record revenue based upon the estimated number of days completed to date, which is consistent with ratable recognition. Customized products with no alternative future use to the Company, and that have an enforceable right to payment for performance completed to date, are also recorded over time. The Company considers this to be a faithful depiction of the transfer to the customer of revenue over time as the work is performed or service is delivered, ratably over time.

Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring goods or providing services. Performance obligations promised in a contract are identified based on the products or services that will be transferred to the customer that are both capable of being distinct, whereby the customer can benefit from the product or service either on its own or together with other resources that are readily available from third parties or from the Company, and are distinct in the context of the contract, whereby the transfer of the product or service is separately identifiable from other promises in the contract. Sales, value add, and other taxes the Company collects concurrent with revenue-producing activities are excluded from revenue. The Company’s normal payment terms are 30 to 60 days but vary by the type and location of its customers and the products or services offered. The time between invoicing and when payment is due is not significant. For certain products or services and customer types, the Company requires payment before the products or services are delivered to the customer. None of the Company’s contracts as of June 30, 2018 contain a significant financing component. Contract assets as of January 1 and June 30, 2018 were $3,065 and $3,298, respectively, and included in other current assets.

Contracts with Multiple Performance Obligations

The Company periodically enters into contracts with its customers in which a customer may purchase a combination of goods and or services, such as products with installation services or extended warranty obligations. These contracts include multiple promises that the Company evaluates to determine if the promises are separate performance obligations. Once the Company determines the performance obligations, the Company then determines the transaction price, which includes estimating the amount of variable consideration to be included in the transaction price, if any. To the extent the transaction price includes variable consideration, the Company estimates the amount of variable consideration that should be included in the transaction price utilizing either the expected value method or the most likely amount method depending on the method the Company expects to better predict the amount of consideration to which it will be entitled. There are no constraints on the variable consideration recorded. The Company then allocates the transaction price to each performance obligation in the contract based on a relative stand-alone selling price charged separately to customers or using an expected cost plus margin method. The corresponding revenues are recognized when or as the related performance obligations are satisfied, which are noted above. Impacts of variable consideration were immaterial during the three and six months ended June 30, 2018.

Deferred Revenues

The Company’s standard assurance warranty period is normally 12 to 24 months. The Company sells separately-priced service contracts and extended warranty contracts related to certain of its products, especially its laser products. The separately priced contracts generally range from 12 to 60 months. The Company normally receives payment at the inception of the contract and recognizes revenue over the term of the agreement in proportion to the costs expected to be incurred in satisfying the obligations under the contract. The Company has elected to use the practical expedient related to disclosing the remaining performance obligations as of June 30, 2018, as the majority have a duration of less than one year.

A rollforward of the Company’s deferred revenue is as follows:


	Six Months Ended June 30, 2018
Beginning balance, January 1⁽¹⁾	$	14,448
Amount of deferred revenue recognized in income		(10,092	)
Additions to deferred revenue		9,924

Ending balance, June 30⁽²⁾	$	14,280

⁽¹⁾

Beginning deferred revenue as of January 1, 2018 included $11,322 of current deferred revenue and $3,126 of long-term deferred revenue.

⁽²⁾

Ending deferred revenue as of June 30, 2018 included $10,729 of current deferred revenue and $3,551 of long-term deferred revenue.

Costs to Obtain and Fulfill a Contract

Under ASC 606, the Company expenses sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within selling, general and administration expenses. The Company has elected to recognize the costs for freight and shipping when control over products has transferred to the customer as an expense in cost of sales.

The Company monitors and tracks the amount of product returns and reduces revenue at the time of shipment for the estimated amount of future returns, based on historical experience. The Company makes estimates evaluating its allowance for doubtful accounts. The Company continuously monitors collections and payments from its customers and maintains a provision for estimated credit losses based upon its historical experience and any specific customer collection issues that it has identified.

Disaggregation of Revenue

The following table summarizes revenue from contracts with customers:


	Three Months Ended June 30, 2018
	Vacuum & Analysis		Light & Motion		Total
Net revenues:
Products	$	321,454	$	188,545	$	509,999
Services		46,874		16,267		63,141

Total net revenues	$	368,328	$	204,812	$	573,140

	Three Months Ended June 30, 2017
	Vacuum & Analysis		Light & Motion		Total
Net revenues:
Products	$	269,665	$	156,652	$	426,317
Services		40,296		14,144		54,440

Total net revenues	$	309,961	$	170,796	$	480,757


	Six Months Ended June 30, 2018
	Vacuum & Analysis		Light & Motion		Total
Net revenues:
Products	$	625,790	$	380,886	$	1,006,676
Services		90,882		29,857		120,739

Total net revenues	$	716,672	$	410,743	$	1,127,415


	Six Months Ended June 30, 2017
	Vacuum & Analysis		Light & Motion		Total
Net revenues:
Products	$	511,120	$	303,135	$	814,255
Services		76,825		26,830		103,655

Total net revenues	$	587,945	$	329,965	$	917,910

Product revenue, excluding revenue from certain custom products, is recorded at a point in time, while the majority of the service revenue and revenue from certain custom products are recorded over time.

Refer to Note 17 in the financial statements for revenue by reportable segment, geography and groupings of similar products.

Investments

6 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

4)	Investments

The fair value of investments classified as short-term consists of the following:


	June 30, 2018		December 31, 2017
Available-for-sale investments:
Time deposits and certificates of deposit	$	18,455	$	9,757
Bankers’ acceptance drafts		2,522		5,330
Asset-backed securities		34,727		36,990
Commercial paper		25,925		13,750
Corporate obligations		66,663		77,821
Municipal bonds		2,615		1,970
U.S. treasury obligations		31,434		28,078
U.S. agency obligations		21,345		35,738

	$	203,686	$	209,434

Investments classified as long-term consist of the following:


	June 30, 2018		December 31, 2017
Available-for-sale investments:
Group insurance contracts	$	6,076	$	6,255
Cost method investments:
Minority interest in a private company		4,400		4,400

	$	10,476	$	10,655

The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:


As of June 30, 2018:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit	$	18,452	$	3	$	—		$	18,455
Bankers’ acceptance drafts		2,522		—		—			2,522
Asset-backed securities		34,760		9		(42	)		34,727
Commercial paper		26,337		—		(412	)		25,925
Corporate obligations		66,632		59		(28	)		66,663
Municipal bonds		2,620		—		(5	)		2,615
U.S. treasury obligations		31,418		16		—			31,434
U.S. agency obligations		21,341		5		(1	)		21,345

	$	204,082	$	92	$	(488	)	$	203,686


As of June 30, 2018:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Long-term investments:
Available-for-sale investments:
Group insurance contracts	$	6,051	$	25	$	—		$	6,076


As of December 31, 2017:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit	$	9,756	$	1	$	—		$	9,757
Bankers acceptance drafts		5,330		—		—			5,330
Asset-backed securities		37,017		15		(42	)		36,990
Commercial paper		13,810		—		(60	)		13,750
Corporate obligations		77,788		58		(25	)		77,821
Municipal bonds		1,970		—		—			1,970
U.S. treasury obligations		28,054		24		—			28,078
U.S. agency obligations		35,728		10		—			35,738

	$	209,453	$	108	$	(127	)	$	209,434


As of December 31, 2017:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Long-term investments:
Available-for-sale investments:
Group insurance contracts	$	6,006	$	249	$	—		$	6,255

The tables above, which show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments as of June 30, 2018 and December 31, 2017, reflect the inclusion within short-term investments of investments with contractual maturities greater than one year from the date of purchase. Management has the ability, if necessary, to liquidate any of its investments in order to meet the Company’s liquidity needs in the next 12 months. Accordingly, those investments with contractual maturities greater than one year from the date of purchase are classified as short-term on the accompanying balance sheets.

The Company reviews and evaluates its investments for any indication of possible impairment. Based on this review, the Company has determined that the unrealized losses related to these investments at June 30, 2018 and December 31, 2017, were temporary.

Interest income is accrued as earned. Dividend income is recognized as income on the date the stock trades “ex-dividend.” The cost of marketable securities sold is determined by the specific identification method. Realized gains or losses are reflected in income and were not material for the six months ended June 30, 2018 and 2017.

Fair Value Measurements

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

5)	Fair Value Measurements

In accordance with the provisions of fair value accounting, a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability and defines fair value based upon an exit price model.

The fair value measurement guidance establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance describes three levels of inputs that may be used to measure fair value:

Level 1

Quoted prices in active markets for identical assets or liabilities assessed as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2

Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments or securities or derivative contracts that are valued using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.

Level 3

Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the Company categorizes such assets and liabilities based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

Assets and liabilities of the Company are measured at fair value on a recurring basis as of June 30, 2018 and are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	June 30, 2018		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	13,636	$	13,636	$	—	$	—
Time deposits and certificates of deposit		2,000		—		2,000		—
Commercial paper		14,433		—		14,433		—
Corporate obligations		1,560		—		1,560		—
U.S. agency obligations		10,847		—		10,847		—
Restricted cash – money market funds		114		114		—		—
Available-for-sale investments:
Time deposits and certificates of deposit		18,455		—		18,455		—
Bankers acceptance drafts		2,522		—		2,522		—
Asset-backed securities		34,727		—		34,727		—
Commercial paper		25,925		—		25,925		—
Corporate obligations		66,663		—		66,663		—
Municipal bonds		2,615		—		2,615		—
U.S. treasury obligations		31,434		—		31,434		—
U.S. agency obligations		21,345		—		21,345		—
Group insurance contracts		6,076		—		6,076		—
Derivatives – foreign exchange contracts		3,666		—		3,666		—
Funds in investments and other assets:
Israeli pension assets		15,796		—		15,796		—
Derivatives – interest rate hedge – non-current		8,565		—		8,565		—

Total assets	$	280,379	$	13,750	$	266,629	$	—

Liabilities:

Derivatives – foreign exchange contracts	$	822	$	—	$	822	$	—

Reported as follows:
Assets:
Cash and cash equivalents⁽¹⁾	$	42,476	$	13,636	$	28,840	$	—
Restricted cash		114		114		—		—
Short-term investments		203,686		—		203,686		—
Other current assets		3,666		—		3,666		—

Total current assets	$	249,942	$	13,750	$	236,192	$	—

Long-term investments⁽²⁾	$	6,076	$	—	$	6,076	$	—
Other assets		24,361		—		24,361		—

Total long-term assets	$	30,437	$	—	$	30,437	$	—

Liabilities:

Other current liabilities	$	822	$	—	$	822	$	—

⁽¹⁾	The cash and cash equivalent amounts presented in the table above do not include cash of $384,841 as of June 30, 2018.

⁽²⁾	The long-term investments presented in the table above do not include the Company’s minority interest investment in a private company, which is accounted for under the cost method.

Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2017 and are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	December 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	4,987	$	4,987	$	—	$	—
Time deposits and certificates of deposit		2,100		—		2,100		—
Commercial paper		30,475		—		30,475		—
Restricted cash – money market funds		119		119		—		—
Available-for-sale investments:
Time deposits and certificates of deposit		9,757		—		9,757		—
Bankers acceptance drafts		5,330		—		5,330		—
Asset-backed securities		36,990		—		36,990		—
Commercial paper		13,750		—		13,750		—
Corporate obligations		77,821		—		77,821		—
Municipal bonds		1,970		—		1,970		—
U.S. treasury obligations		28,078		—		28,078		—
U.S. agency obligations		35,738		—		35,738		—
Group insurance contracts		6,255		—		6,255		—
Derivatives – foreign exchange contracts		168		—		168		—
Funds in investments and other assets:
Israeli pension assets		15,048		—		15,048		—
Derivatives – interest rate hedge – non-current		6,179		—		6,179		—

Total assets	$	274,765	$	5,106	$	269,659	$	—

Liabilities:
Derivatives – foreign exchange contracts	$	6,198	$	—	$	6,198	$	—

Total liabilities	$	6,198	$	—	$	6,198	$	—

Assets:
Cash and cash equivalents⁽¹⁾	$	37,562	$	4,987	$	32,575	$	—
Restricted cash		119		119		—		—
Short-term investments		209,434		—		209,434		—
Other current assets		168		—		168		—

Total current assets	$	247,283	$	5,106	$	242,177	$	—

Long-term investments⁽²⁾	$	6,255	$	—	$	6,255	$	—
Other assets		21,227		—		21,227		—

Total long-term assets	$	27,482	$	—	$	27,482	$	—

Liabilities:
Other current liabilities	$	6,198	$	—	$	6,198	$	—

⁽¹⁾	The cash and cash equivalent amounts presented in the table above do not include cash of $292,808 and non-negotiable time deposits of $3,398 as of December 31, 2017.

⁽²⁾	The long-term investments presented in the table above do not include the Company’s minority interest investment in a private company, which is accounted for under the cost method.

Money Market Funds

Money market funds are cash and cash equivalents and are classified within Level 1 of the fair value hierarchy.

Available-For-Sale Investments

Available-for-sale investments consisted of time deposits and drafts, certificates of deposit, bankers acceptance drafts, asset-backed securities (which include auto loans, credit card receivables and equipment trust receivables), commercial paper, corporate obligations, municipal bonds, U.S. treasury obligations and U.S. agency obligations.

The Company measures its debt and equity investments at fair value. The Company’s available-for-sale investments are classified within Level 2 of the fair value hierarchy.

Israeli Pension Assets

Israeli pension assets represent investments in mutual funds, government securities and other time deposits. These investments are set aside for the retirement benefit of the employees at the Company’s Israeli subsidiaries. These funds are classified within Level 2 of the fair value hierarchy.

Derivatives

As a result of the Company’s global operating activities, the Company is exposed to market risks from changes in foreign currency exchange rates and variable interest rates, which may adversely affect its operating results and financial position. When deemed appropriate, the Company minimizes its risks from foreign currency exchange rate and interest rate fluctuations through the use of derivative financial instruments. The principal market in which the Company executes its foreign currency contracts and interest rate swaps is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants usually are large commercial banks. The forward foreign currency exchange contracts and interest rate hedge are valued using broker quotations or market transactions and are classified within Level 2 of the fair value hierarchy.

Derivatives

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

6)	Derivatives

The Company enters into derivative instruments for risk management purposes only, including derivatives designated as hedging instruments and those utilized as economic hedges. The Company operates internationally and, in the normal course of business, is exposed to fluctuations in interest rates and foreign exchange rates. These fluctuations can increase the costs of financing, investing and operating the business. The Company has used derivative instruments, such as forward foreign currency exchange contracts, to manage certain foreign currency exposure, and interest rate swaps to manage interest rate exposure.

By nature, all financial instruments involve market and credit risks. The Company enters into derivative instruments with major investment grade financial institutions, for which no collateral is required. The Company has policies to monitor the credit risk of these counterparties. While there can be no assurance, the Company does not anticipate any material non-performance by any of these counterparties.

Interest Rate Swap Agreement

On September 30, 2016, the Company entered into an interest rate swap agreement to fix the rate on approximately 50% of its then-outstanding balance under the Credit Agreement, as described further in Note 10. This hedge fixes the interest rate paid on the hedged debt at 1.198% per annum plus the applicable credit spread, which was 1.75% as of June 30, 2018, through September 30, 2020. The interest rate swap is recorded at fair value on the balance sheet and changes in the fair value are recognized in other comprehensive income (loss) (“OCI”). To the extent that this arrangement is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded currently in earnings in the period it occurs. The notional amount of this transaction was $305,000 and had a fair value of $8,565 at June 30, 2018. The notional amount of this transaction was $305,000 and had a fair value of $6,179 at December 31, 2017.

Foreign Exchange Contracts

The Company hedges a portion of its forecasted foreign currency-denominated intercompany sales of inventory, over a maximum period of eighteen months, using forward foreign exchange contracts accounted for as cash-flow hedges related to Japanese, South Korean, British, Euro and Taiwanese currencies. To the extent these derivatives are effective in off-setting the variability of the hedged cash flows, and otherwise meet the hedge accounting criteria, changes in the derivatives’ fair value are not included in current earnings but are included in OCI in stockholders’ equity. These changes in fair value will subsequently be reclassified into earnings, as applicable, when the forecasted transaction occurs. To the extent that a previously designated hedging transaction is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded currently in earnings in the period it occurs. The cash flows resulting from forward exchange contracts are classified in the consolidated statements of cash flows as part of cash flows from operating activities. The Company does not enter into derivative instruments for trading or speculative purposes.

As of June 30, 2018 and December 31, 2017, the Company had outstanding forward foreign exchange contracts with gross notional values of $178,327 and $208,922, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of June 30, 2018 and December 31, 2017:


	June 30, 2018
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value⁽¹⁾
U.S. Dollar/Japanese Yen	$	47,023	$	416
U.S. Dollar/South Korean Won		73,485		1,226
U.S. Dollar/Euro		26,059		435
U.S. Dollar/U.K. Pound Sterling		12,763		250
U.S. Dollar/Taiwan Dollar		18,997		517

Total	$	178,327	$	2,844


	December 31, 2017
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value⁽¹⁾
U.S. Dollar/Japanese Yen	$	70,175	$	(233	)
U.S. Dollar/South Korean Won		79,672		(3,799	)
U.S. Dollar/Euro		26,140		(1,047	)
U.S. Dollar/U.K. Pound Sterling		12,104		(337	)
U.S. Dollar/Taiwan Dollar		20,831		(614	)

Total	$	208,922	$	(6,030	)

⁽¹⁾	Represents the receivable (payable) amount included in the consolidated balance sheet.

The following table provides a summary of the fair value amounts of the Company’s derivative instruments:


Derivatives Designated as Hedging Instruments	June 30, 2018			December 31, 2017
Derivative assets:
Foreign exchange contracts⁽¹⁾	$	3,666		$	168
Foreign currency interest rate hedge⁽²⁾		8,565			6,179
Derivative liabilities:
Foreign exchange contracts⁽¹⁾		(822	)		(6,198	)

Total net derivative asset designated as hedging instruments	$	11,409		$	149

⁽¹⁾

The derivative asset of $3,666 and $168 as of June 30, 2018 and December 31, 2017, respectively, related to foreign exchange contracts and is classified in other current assets in the consolidated balance sheet. The derivative liability of $(822) and $(6,198) as of June 30, 2018 and December 31, 2017, respectively, is classified in other current liabilities in the consolidated balance sheet. These foreign exchange contracts are subject to a master netting agreement with one financial institution. However, the Company has elected to record these contracts on a gross basis in the balance sheet.

⁽²⁾	The interest rate hedge assets of $8,565 and $6,179 as of June 30, 2018 and December 31, 2017, respectively, are classified in other assets in the consolidated balance sheet.

The net amount of existing gains as of June 30, 2018 that the Company expects to reclassify from OCI into earnings within the next twelve months is immaterial.

The following table provides a summary of the gains (losses) on derivatives designated as cash flow hedging instruments:


	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Derivatives Designated as Cash Flow Hedging Instruments
Forward exchange contracts:
Net gain (loss) recognized in OCI⁽¹⁾	$	10,079		$	29		$	10,145		$	(4,242	)
Net loss reclassified from accumulated OCI into income⁽²⁾	$	(2,648	)	$	(934	)	$	(5,188	)	$	(482	)

⁽¹⁾	Net change in the fair value of the effective portion classified in OCI.

⁽²⁾	Effective portion classified in cost of products for the three and six months ended June 30, 2018 and 2017. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial.

The following table provides a summary of the gains (losses) on derivatives not designated as hedging instruments:


	Three Months Ended June 30,					Six Months Ended June 30,
	2018		2017			2018		2017
Derivatives Not Designated as Hedging Instruments
Forward exchange contracts:
Net loss recognized in income⁽¹⁾	$	1,375	$	(219	)	$	122	$	(1,682	)

⁽¹⁾

The Company enters into foreign exchange contracts to hedge against changes in the balance sheet for certain subsidiaries to mitigate the risk associated with certain foreign currency transactions in the ordinary course of business. These derivatives are not designated as hedging instruments and gains or losses from these derivatives are recorded immediately in other (expense) income.

Inventories, net

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Inventories, net

7)	Inventories, net

Inventories consist of the following:


	June 30, 2018		December 31, 2017
Raw materials	$	221,914	$	191,351
Work-in-process		63,372		54,050
Finished goods		99,643		93,680

	$	384,929	$	339,081

Dispositions

6 Months Ended

Jun. 30, 2018

Discontinued Operations and Disposal Groups [Abstract]

Dispositions

8)	Dispositions

Sale of Data Analytics Solutions

In April 2017, the Company completed the sale of its Data Analytics Solutions business for total proceeds of $72,509, net of cash sold and recorded a gain of $74,856. This business, which had revenues in 2016 of $12,700 and was included in the Vacuum & Analysis segment, was no longer a part of the Company’s long-term strategic objectives.

The business did not qualify as a discontinued operation as this sale did not represent a strategic shift in the Company’s business, nor did the sale have a major effect on the Company’s operations. Therefore, the results of operations for all periods are included in the Company’s income from operations. The assets and liabilities of this business have not been reclassified or segregated in the consolidated balance sheet or consolidated statements of cash flows as the amounts were immaterial.

Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

9)	Goodwill and Intangible Assets

Goodwill

The Company’s methodology for allocating the purchase price relating to purchase acquisitions is determined through established and generally accepted valuation techniques. Goodwill is measured as the excess of the cost of the acquisition over the sum of the amounts assigned to tangible and identifiable intangible assets acquired less liabilities assumed. The Company assigns assets acquired (including goodwill) and liabilities assumed to one or more reporting units as of the date of acquisition. Typically acquisitions relate to a single reporting unit and thus do not require the allocation of goodwill to multiple reporting units. If the products obtained in an acquisition are assigned to multiple reporting units, the goodwill is distributed to the respective reporting units as part of the purchase price allocation process.

Goodwill and purchased intangible assets with indefinite useful lives are not amortized, but are reviewed for impairment annually during the fourth quarter of each fiscal year and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. The process of evaluating the potential impairment of goodwill and intangible assets requires significant judgment. The Company regularly monitors current business conditions and other factors including, but not limited to, adverse industry or economic trends, restructuring actions and lower projections of profitability that may impact future operating results.

The changes in the carrying amount of goodwill and accumulated impairment (loss) during the six months ended June 30, 2018 and year ended December 31, 2017 were as follows:


	Six Months Ended June 30, 2018									Twelve Months Ended December 31, 2017
	Gross Carrying Amount			Accumulated Impairment (Loss)			Net			Gross Carrying Amount			Accumulated Impairment (Loss)			Net
Beginning balance at January 1	$	735,323		$	(144,276	)	$	591,047		$	727,999		$	(139,414	)	$	588,585
Sale of business⁽¹⁾		—			—			—			(3,115	)		—			(3,115	)
Impairment loss⁽²⁾		—			—			—			—			(4,862	)		(4,862	)
Foreign currency translation		(2,329	)		—			(2,329	)		10,439			—			10,439

Ending balance at June 30, 2018 and December 31, 2017	$	732,994		$	(144,276	)	$	588,718		$	735,323		$	(144,276	)	$	591,047

⁽¹⁾	In 2017, the Company sold its Data Analytics Solutions business and, as a result, charged the related goodwill of $(3,115) to the gain on sale of business.

⁽²⁾	In 2017, the Company recorded an impairment loss of $(4,862) related to the write-off of goodwill related to the discontinuation of a product line and consolidation of two manufacturing plants.

Intangible Assets

Components of the Company’s intangible assets are comprised of the following:


As of June 30, 2018:	Gross		Impairment Charges⁽¹⁾			Accumulated Amortization			Foreign Currency Translation		Net
Completed technology	$	172,431	$	(105	)	$	(126,383	)	$	26	$	45,969
Customer relationships		282,744		(1,406	)		(54,712	)		550		227,176
Patents, trademarks, trade names and other		110,523		—			(40,985	)		1		69,539

	$	565,698	$	(1,511	)	$	(222,080	)	$	577	$	342,684


As of December 31, 2017:	Gross		Impairment Charges⁽¹⁾			Accumulated Amortization			Foreign Currency Translation			Net
Completed technology	$	172,431	$	(105	)	$	(115,371	)	$	333		$	57,288
Customer relationships		282,744		(1,406	)		(45,518	)		1,571			237,391
Patents, trademarks, trade names and other		110,523		—			(38,730	)		(74	)		71,719

	$	565,698	$	(1,511	)	$	(199,619	)	$	1,830		$	366,398

⁽¹⁾	In 2017, the Company recorded impairment charges of $1,511 related to the write-off of intangible assets as a result of the discontinuation of a product line and consolidation of two manufacturing plants.

Aggregate amortization expense related to acquired intangibles for the six months ended June 30, 2018 and 2017 was $22,091 and $23,969, respectively. The amortization expense for the six months ended June 30, 2018 and 2017 is net of $370 and $366, respectively, of amortization income from unfavorable lease commitments. Aggregate net amortization expense related to acquired intangible assets and unfavorable lease commitments for future years is as follows:


Year	Amount
2018 (remaining)	$	21,475
2019		40,182
2020		28,152
2021		20,272
2022		17,645
2023		17,280
Thereafter		139,195

Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt

10)

Debt

Term Loan Credit Agreement

In connection with the completion of the Company’s acquisition of Newport Corporation (“Newport”) in April 2016 (the “Newport Merger”), the Company entered into a term loan credit agreement (the “Credit Agreement”) with Barclays Bank PLC, as administrative agent and collateral agent, and the lenders from time to time party thereto (the “Lenders”), that provided senior secured financing of $780,000, subject to increase at the Company’s option in accordance with the Credit Agreement (the “Term Loan Facility”). Borrowings under the Term Loan Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, and (4) a floor of 1.75%, plus, in each case, an applicable margin; or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR rate floor of 0.75%, plus an applicable margin. The Company has elected the interest rate as described in clause (b). The Credit Agreement provides that all loans will be determined by reference to the Base Rate if the LIBOR rate cannot be ascertained, if regulators impose material restrictions on the authority of a lender to make LIBOR rate loans, or for other reasons. The Term Loan Facility was issued with original issue discount of 1.00% of the principal amount thereof.

On June 9, 2016, the Company entered into Amendment No. 1 (the “Repricing Amendment 1”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 1 decreased the applicable margin for borrowings under the Company’s Term Loan Facility to 2.50% for base rate borrowings and 3.50% for LIBOR borrowings and extended the period during which a prepayment premium may be required for a “Repricing Transaction” (as defined in the Credit Agreement) until six months after the effective date of the Repricing Amendment 1. In connection with the execution of the Repricing Amendment 1, the Company paid a prepayment premium of 1.00%, or $7,300, as well as certain fees and expenses of the administrative agent and the Lenders, in accordance with the terms of the Credit Agreement. Immediately prior to the effectiveness of the Repricing Amendment 1, the Company prepaid $50,000 of principal under the Credit Agreement. In September 2016, the Company prepaid an additional $60,000 under the Credit Agreement.

On September 30, 2016, the Company entered into an interest rate swap agreement, which has a maturity date of September 30, 2020, to fix the rate on $335,000 of the then-outstanding balance of the Credit Agreement. The rate is fixed at 1.198% per annum plus the applicable credit spread, which was 1.75% at June 30, 2018. The notional amount of this transaction was $305,000 and had a fair value of $8,565 at June 30, 2018.

On December 14, 2016, the Company entered into Amendment No. 2 (the “Repricing Amendment 2”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 2 decreased the applicable margin for the Company’s term loan under the Credit Agreement to 2.75% for LIBOR borrowings and 1.75% for base rate borrowings and reset the period during which a prepayment premium may be required for a Repricing Transaction until six months after the effective date of the Repricing Amendment 2. In November 2016, prior to the effectiveness of the Repricing Amendment 2, the Company prepaid an additional $40,000 of principal under the Credit Agreement. In March 2017, the Company prepaid an additional $50,000 of principal under the Credit Agreement.

On July 6, 2017, the Company entered into Amendment No. 3 (the “Repricing Amendment 3”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 3 decreased the applicable margin for the Company’s term loan under the Credit Agreement to 2.25% for LIBOR rate loans when the Total Leverage Ratio (as defined in the Credit Agreement) was at or above 1.25:1 and decreased to 2.00% when the Total Leverage Ratio was below 1.25:1, both with a LIBOR floor of 0.75%. The margin for base rate borrowings decreased to 1.25% when the Total Leverage Ratio is at or above 1.25:1 and to 1.00% when the Total Leverage Ratio is below 1.25:1. The period during which a prepayment premium may be required for a Repricing Transaction was reset to six months after the effective date of the Repricing Amendment 3.

On April 11, 2018, the Company entered into Amendment No. 4 (the “Repricing Amendment 4”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 4 decreased the applicable margin for the Company’s LIBOR rate term loan under the Credit Agreement to 1.75%, with a LIBOR rate floor of 0.75%. The margin for base rate borrowings decreased to 0.75% with a base rate floor of 1.75%. The period during which a prepayment premium may be required for a Repricing Transaction was reset to six months after the effective date of the Repricing Amendment 4.

In July 2017, August 2017, November 2017 and March 2018 the Company prepaid $50,000, $75,000, $50,000 and $50,000, respectively, of principal under the Credit Agreement. As of June 30, 2018, after total prepayments of $425,000 and regularly scheduled principal payments of $6,536, the total outstanding principal balance was $348,464. The interest rate as of June 30, 2018 was 3.7%.

The Company incurred $28,747 of deferred finance fees, original issue discount and repricing fees related to the term loans under the Term Loan Facility, which is included in long-term debt in the accompanying consolidated balance sheets and are being amortized to interest expense over the estimated life of the term loans using the effective interest method. A portion of these fees has been accelerated in connection with the various debt prepayments during 2016, 2017 and 2018. As of June 30, 2018, the remaining balance of the deferred finance fees, original issue discount and repricing fee related to the Term Loan Facility was $6,418.

Under the Credit Agreement, the Company is required to prepay outstanding term loans, subject to certain exceptions, with portions of its annual excess cash flow as well as with the net cash proceeds of certain asset sales, certain casualty and condemnation events and the incurrence or issuance of certain debt. The Company is also required to make scheduled quarterly payments each equal to 0.25% of the principal amount of the term loans outstanding, less the amount of certain voluntary and mandatory repayments after such date, with the balance due on the seventh anniversary of the closing date. As a result of making total prepayments of $425,000 through June 30, 2018 and based on the Company’s Total Leverage Ratio, the Company is no longer required to make any scheduled principal payments until maturity date of the loan.

All obligations under the Term Loan Facility are guaranteed by certain of the Company’s domestic subsidiaries, and are collateralized by substantially all of the Company’s assets and the assets of such subsidiaries, subject to certain exceptions and exclusions.

The Credit Agreement contains customary representations and warranties, affirmative and negative covenants and provisions relating to events of default. If an event of default occurs, the Lenders under the Term Loan Facility will be entitled to take various actions, including the acceleration of amounts due under the Term Loan Facility and all actions generally permitted to be taken by a secured creditor. At June 30, 2018, the Company was in compliance with all covenants under the Credit Agreement.

Senior Secured Asset-Based Revolving Credit Facility

In connection with the completion of the Newport Merger, the Company also entered into an asset-based credit agreement with Deutsche Bank AG New York Branch, as administrative agent and collateral agent, the other borrowers from time to time party thereto, and the lenders and letters of credit issuers from time to time party thereto (the “ABL Facility”), that provides senior secured financing of up to $50,000, subject to a borrowing base limitation. The borrowing base for the ABL Facility at any time equals the sum of: (a) 85% of certain eligible accounts; plus (b) subject to certain notice and field examination and appraisal requirements, the lesser of (i) the lesser of (A) 65% of the lower of cost or market value of certain eligible inventory and (B) 85% of the net orderly liquidation value of certain eligible inventory and (ii) 30% of the borrowing base; minus (c) reserves established by the administrative agent; provided that until the administrative agent’s receipt of a field examination of accounts receivable the borrowing base shall be equal to 70% of the book value of certain eligible accounts. The ABL Facility includes borrowing capacity in the form of letters of credit up to $15,000. The Company has not drawn against the ABL Facility as of June 30, 2018.

Borrowings under the ABL Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, and (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, plus, in each case, an initial applicable margin of 0.75%; and (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, plus an initial applicable margin of 1.75%. Commencing with the completion of the first fiscal quarter ending after the closing of the ABL Facility, the applicable margin for borrowings thereunder is subject to upward or downward adjustment each fiscal quarter, based on the average historical excess availability during the preceding quarter.

The Company incurred $1,201 of costs in connection with the ABL Facility, which were capitalized and included in other assets in the accompanying consolidated balance sheets and are being amortized to interest expense using the straight-line method over the contractual term of five years of the ABL Facility.

In addition to paying interest on outstanding principal under the ABL Facility, the Company is required to pay a commitment fee in respect of the unutilized commitments thereunder. The initial commitment fee is 0.375% per annum. The total commitment fees recognized in interest expense for the three and six months ended June 30, 2018, were immaterial. Commencing with the completion of the first fiscal quarter ending after the closing of the ABL Facility, the commitment fee is subject to downward adjustment based on the amount of average unutilized commitments for the three month period immediately preceding such adjustment date. The Company must also pay customary letter of credit fees and agency fees.

Lines of Credit and Short-Term Borrowing Arrangements

One of the Company’s Japanese subsidiaries has lines of credit and short-term borrowing arrangements with two financial institutions, which arrangements generally expire and are renewed at three month intervals. The lines of credit provided for aggregate borrowings as of June 30, 2018 of up to an equivalent of $20,779 U.S. dollars. One of the borrowing arrangements has an interest rate based on the Tokyo Interbank Offer Rate at the time of borrowing and the other has an interest rate based on the Japanese Short-Term Prime Lending Rate. Total borrowings outstanding under these arrangements were $6,795 at June 30, 2018. There were no borrowings outstanding under these arrangements at December 31, 2017.

The Company assumed various revolving lines of credit and a financing facility with the completion of the Newport Merger. These revolving lines of credit and financing facility have no expiration date and provided for aggregate borrowings as of June 30, 2018 of up to an equivalent of $11,293 U.S. dollars. These lines of credit have a base interest rate of 1.25% plus a Japanese Yen overnight LIBOR rate. Total borrowings outstanding under these arrangements were $5,067 and $2,965 at June 30, 2018 and December 31, 2017.

One of the Company’s Austrian subsidiaries has various outstanding loans from the Austrian government to fund research and development. These loans are unsecured and do not require principal repayment as long as certain conditions are met. Interest on these loans is payable semi-annually. The interest rates associated with these loans range from 0.75% to 2.00%.


	June 30, 2018		December 31, 2017
Short-term debt:
Japanese lines of credit	$	11,862	$	2,750
Japanese receivables financing facility		—		215
Austrian loans due through March 2019		646		—
Other debt		3		7

	$	12,511	$	2,972


	June 30, 2018		December 31, 2017
Long-term debt:
Austrian loans due through March 2020	$	50	$	714
Term Loan Facility, net⁽¹⁾		342,046		389,279

	$	342,096	$	389,993

⁽¹⁾	Net of deferred financing fees, original issuance discount and repricing fee of $6,418 and $9,185 as of June 30, 2018 and December 31, 2017, respectively.

The Company recognized interest expense of $9,352 and $15,829 for the six months ended June 30, 2018 and 2017, respectively.

Contractual maturities of the Company’s debt obligations as of June 30, 2018 are as follows:


Year	Amount
2018 (remaining)	$	11,877
2019		634
2020		50
2021		—
2022		—
Thereafter		348,464

Product Warranties

6 Months Ended

Jun. 30, 2018

Guarantees and Product Warranties [Abstract]

Product Warranties

11)	Product Warranties

The Company records the estimated costs to fulfill customer warranty obligations upon the recognition of the related revenue. While the Company engages in extensive product quality programs and processes, including actively monitoring and evaluating the quality of its component suppliers, the Company’s warranty obligation is affected by shipment volume, product failure rates, utilization levels, material usage, and supplier warranties on parts delivered to the Company. Should actual product failure rates, utilization levels, material usage, or supplier warranties on parts differ from the Company’s estimates, revisions to the estimated warranty liability would be required.

Product warranty activities were as follows:


	Six Months Ended June 30,
	2018			2017
Beginning of period	$	10,104		$	8,261
Provision for product warranties		8,484			7,555
Direct and other charges to warranty liability		(7,328	)		(6,084	)

End of period⁽¹⁾	$	11,260		$	9,732

⁽¹⁾

Short-term product warranty of $10,846 and long-term product warranty of $414 as of June 30, 2018, are included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet. Short-term product warranty of $9,293 and long-term product warranty of $439 as of June 30, 2017, are included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet.

Income Taxes

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

12)	Income Taxes

The Tax Cuts and Jobs Act (“the Act”) was enacted on December 22, 2017. The Act reduces the U.S. federal corporate income tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and creates new taxes on certain foreign sourced earnings. The Company is applying SAB 118 when accounting for the enactment effects of the Act. As of June 30, 2018, the Company has not completed the accounting for all of the tax effects of the Act; however provisional estimates have been recorded.

For the quarter ended June 30, 2018, the Company recognized a tax benefit of $659 from an adjustment of the provisional estimates recorded for the Act and included these adjustments as a component of income tax expense from continuing operations. The calculations will continue to be refined and adjusted as additional analysis is completed and more guidance is issued. These future adjustments could be material to income tax expense.

The global intangible low-taxed income (“GILTI”) provision from the Act subjects a U.S. shareholder to current tax on GILTI earned by certain foreign subsidiaries. Under FASB Staff Q&A, Topic 740 No. 5, the Company has elected to recognize the resulting tax on GILTI as a period expense in the period the tax is incurred. The Company expects to incur GILTI tax for the year ended December 31, 2018. The estimate for this GILTI tax, net of foreign tax credits, increased the Company’s effective tax rate for 2018 by approximately 1.0%.

The Company’s effective tax rate for the three and six months ended June 30, 2018 was 17.3% and 17.2%, respectively. The effective tax rate for the three and six months ended June 30, 2018, and related income tax expense, was lower than the U.S. statutory tax rate mainly due to the geographic mix of income earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory tax rate, windfall benefits of stock compensation, and the new deduction for foreign derived intangible income from the Act offset by the tax effects of the new provision for global intangible low taxed income from the Act and state income taxes.

The effective tax rate for the three and six months ended June 30, 2017 was lower than the U.S. statutory tax rate mainly due to the impact of lower tax rates on foreign income, the deduction for domestic production activities and windfall benefits of stock compensation.

As of June 30, 2018 and December 31, 2017, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $28,961 and $27,345, respectively. As of June 30, 2018, if these benefits were recognized in a future period, the timing of which is not estimable, the net unrecognized tax benefit of $21,491, excluding interest and penalties, would impact the Company’s effective tax rate. The Company accrues interest expense, and if applicable, penalties, for any uncertain tax positions. Interest and penalties are classified as a component of income tax expense. As of June 30, 2018 and December 31, 2017, the Company had accrued interest on unrecognized tax benefits of approximately $572 and $327, respectively.

Over the next 12 months it is reasonably possible that the Company may recognize approximately $1,920 of previously net unrecognized tax benefits, excluding interest and penalties, related to various U.S. federal, state and foreign tax positions primarily as a result of the expiration of certain statutes of limitations.

The Company and its subsidiaries are subject to examination by U.S. federal, state and foreign tax authorities. The United States Internal Revenue Service commenced an examination of our U.S. federal income tax filings for tax years 2015 and 2016 during the quarter ended September 30, 2017. This audit was effectively settled during the quarter ended March 31, 2018, and the impact was not material. During the quarter ended March 31, 2018, the Company received notification from the United States Internal Revenue Service of their intent to audit its U.S. subsidiary, Newport Corporation, for tax year 2015. This audit commenced during the quarter ended June 30, 2018. The U.S. statute of limitations remains open for tax years 2014 through present. The statute of limitations for the Company’s tax filings in other jurisdictions varies between fiscal years 2012 through present. We also have certain federal credit carry-forwards and state tax loss and credit carry-forwards that are open to examination for tax years 2000 through the present.

Pension Plans

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Pension Plans

13)	Pension Plans

As a result of the acquisition of Newport, the Company has assumed all assets and liabilities of Newport’s defined benefit pension plans, which covers substantially all of its full-time employees in France, Germany, Israel and Japan. In addition, there are certain pension liabilities relating to former employees in the United Kingdom. The German plan is unfunded, as permitted under the plan and applicable laws. The net periodic benefit costs were immaterial for both the three and six month periods ended June 30, 2018 and 2017. The Company’s contributions to these plans for both the three and six month periods ended June 30, 2018 and 2017, as required by local pension accounting laws, were immaterial.

Net Income Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Net Income Per Share

14)	Net Income Per Share

The following table sets forth the computation of basic and diluted net income per share:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Numerator:
Net income	$	122,862	$	120,440	$	227,983	$	185,500

Denominator:
Shares used in net income per common share – basic		54,719,000		54,178,000		54,571,000		53,973,000
Effect of dilutive securities:
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan		555,000		823,000		709,000		1,006,000

Shares used in net income per common share – diluted		55,274,000		55,001,000		55,280,000		54,979,000

Net income per common share:
Basic	$	2.25	$	2.22	$	4.18	$	3.44
Diluted	$	2.22	$	2.19	$	4.12	$	3.37

Basic earnings per share (“EPS”) is computed by dividing income available to common stockholders by the weighted-average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding (using the treasury stock method) if securities containing potentially dilutive common shares (restricted stock units and stock appreciation rights) had been converted to such common shares, and if such assumed conversion is dilutive.

For the three and six months ended June 30, 2018, there were approximately 99,000 and 49,000 weighted-average restricted stock units, respectively, that would have had an anti-dilutive effect on EPS, and would thus need to be excluded from the computation of diluted weighted-average shares.

For the three and six months ended June 30, 2017, there were approximately 800 and 5,000 weighted-average restricted stock units, respectively, that would have had an anti-dilutive effect on EPS, and would thus need to be excluded from the computation of diluted weighted-average shares.

Stockholders' Equity

6 Months Ended

Jun. 30, 2018

Federal Home Loan Banks [Abstract]

Stockholders' Equity

15)	Stockholders’ Equity

Share Repurchase Program

On July 25, 2011, the Company’s Board of Directors approved a share repurchase program for the repurchase of up to an aggregate of $200,000 of its outstanding common stock from time to time in open market purchases, privately negotiated transactions or through other appropriate means. The timing and quantity of any shares repurchased will depend upon a variety of factors, including business conditions, stock market conditions and business development activities, including, but not limited to, merger and acquisition opportunities. These repurchases may be commenced, suspended or discontinued at any time without prior notice. The Company has repurchased approximately 1,770,000 shares of common stock for approximately $52,000 pursuant to the program since its adoption. During the three and six months ended June 30, 2018 and 2017, there were no repurchases of common stock.

Cash Dividends

Holders of the Company’s common stock are entitled to receive dividends when they are declared by the Company’s Board of Directors. The Company’s Board of Directors declared a cash dividend of $0.18 per share during the first quarter of 2018 and $0.20 per share during the second quarter of 2018, which totaled $20,750 or $0.38 per share. The Company’s Board of Directors declared a cash dividend of $0.175 per share during the first and second quarters of 2017, which totaled $18,903 or $0.35 per share.

On July 30, 2018, the Company’s Board of Directors declared a quarterly cash dividend of $0.20 per share to be paid on September 7, 2018 to shareholders of record as of August 27, 2018. Future dividend declarations, if any, as well as the record and payment dates for such dividends, are subject to the final determination of the Company’s Board of Directors. In addition, under the terms of the Company’s senior secured Term Loan Facility and its senior secured asset-based revolving credit facility, the Company may be restricted from paying dividends under certain circumstances.

Stock-Based Compensation

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

16)	Stock-Based Compensation

The Company grants restricted stock units (“RSUs”) to employees and directors under the 2014 Stock Incentive Plan (the “2014 Plan”). The 2014 Plan is administered by the Compensation Committee of the Company’s Board of Directors. The 2014 Plan is intended to attract and retain employees and directors, and to provide an incentive for these individuals to assist the Company to achieve long-range performance goals and to enable these individuals to participate in the long-term growth of the Company.

In connection with the completion of the Newport Merger, the Company assumed:

•

all RSUs granted under any Newport equity plan that were outstanding immediately prior to the effective time of the Newport Merger, and as to which shares of Newport common stock were not fully distributed in connection with the closing of the Newport Merger, and

•

all stock appreciation rights (“SARs”) granted under any Newport equity plan, whether vested or unvested, that were outstanding immediately prior to the effective time of the Newport Merger.

During the six months ended June 30, 2018, the Company granted 259,597 RSUs with a weighted average grant date fair value of $112.56. During the six months ended June 30, 2017, the Company granted 376,081 RSUs with a weighted average grant date fair value of $67.13. There were no SARs granted during the six months ended June 30, 2018 or 2017.

The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cost of revenues	$	1,489	$	1,187	$	2,494	$	2,117
Research and development expense		819		827		1,541		1,572
Selling, general and administrative expense		4,058		4,193		12,757		11,300

Total pre-tax stock-based compensation expense	$	6,366	$	6,207	$	16,792	$	14,989

At June 30, 2018, the total compensation expense related to unvested stock-based awards granted to employees and directors under the 2014 Plan that had not been recognized was $30,447, net of estimated forfeitures. The future compensation expense is recognized on a straight-line basis over the requisite service period, net of estimated forfeitures except for retirement eligible employees in which the Company expenses the fair value of the grant in the period the grant is issued. The Company considers many factors when estimating expected forfeitures, including types of awards and historical experience. Actual results and future changes in estimates may differ substantially from the Company’s current estimates.

The following table presents the activity for RSUs under the Plan:


	Six Months Ended June 30, 2018
	Outstanding RSUs			Weighted Average Grant Date Fair Value
RSUs – beginning of period		943,379		$	47.57
Accrued dividend shares		31		$	115.65
Granted		259,597		$	112.56
Vested		(478,238	)	$	44.21
Forfeited		(33,889	)	$	60.77

RSUs – end of period		689,880		$	73.71

The following table presents the activity for SARs under the Plan:


	Six Months Ended June 30, 2018
	Outstanding SARs			Weighted Average Grant Date Fair Value
SARs – beginning of period		282,907		$	28.62
Exercised		(79,767	)	$	28.91
Forfeited or expired		(1,950	)	$	29.00

SARs Outstanding – end of period		201,190		$	28.50

Business Segment, Geographic Area, Product and Significant Customer Information

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Business Segment, Geographic Area, Product and Significant Customer Information

17)	Business Segment, Geographic Area, Product and Significant Customer Information

The Company is a global provider of instruments, subsystems and process control solutions that measure, monitor, deliver, analyze, power and control critical parameters of advanced manufacturing processes to improve process performance and productivity for its customers. The Company’s products are derived from its core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, residual gas analysis, leak detection, control technology, ozone generation and delivery, power, reactive gas generation, vacuum technology, lasers, photonics, sub-micron positioning, vibration control, and optics. The Company also provides services related to the maintenance and repair of its products, installation services and training. The Company’s primary served markets are manufacturers of capital equipment for semiconductor manufacturing, industrial technologies, life and health sciences, as well as research and defense.

The Company’s Chief Operating Decision Maker (“CODM”) utilizes financial information to make decisions about allocating resources and assessing performance for the entire Company, which is used in the decision making process to assess performance. Based upon the information provided to the CODM, the Company has determined it has two reportable segments. The Company’s two reportable segments are: Vacuum & Analysis and Light & Motion.

The Vacuum & Analysis segment provides a broad range of instruments, components and subsystems which are derived from the Company’s core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, residual gas analysis, leak detection, control technology, ozone generation and delivery, RF & DC power, reactive gas generation and vacuum technology.

The Light & Motion segment provides a broad range of instruments, components and subsystems which are derived from the Company’s core competencies in lasers, photonics, sub-micron positioning, vibration control, and optics.

The Company derives its segment results directly from the manner in which results are reported in its management reporting system. The accounting policies that the Company uses to derive reportable segment results are substantially the same as those used for external reporting purposes. The Company does not disclose external or intersegment revenues separately by reportable segment as this information is not presented to the CODM for decision making purposes.

The following are net revenues by reportable segment:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Vacuum & Analysis	$	368,328	$	309,961	$	716,672	$	587,945
Light & Motion		204,812		170,796		410,743		329,965

	$	573,140	$	480,757	$	1,127,415	$	917,910

The following is a reconciliation of segment gross profit to consolidated net income:


	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
Gross profit by reportable segment:
Vacuum & Analysis	$	171,082		$	139,867	$	329,582		$	268,790
Light & Motion		103,795			79,716		208,150			156,340

Total gross profit by reportable segment		274,877			219,583		537,732			425,130
Operating expenses:
Research and development		36,504			33,680		71,361			66,962
Selling, general and administrative		76,559			71,979		159,508			146,199
Acquisition and integration costs		(1,168	)		790		(1,168	)		2,232
Restructuring		790			2,064		2,010			2,586
Asset impairment		—			6,719		—			6,719
Environmental Costs		—			—		1,000			—
Amortization of intangible assets		10,901			11,468		22,091			23,969

Income from operations		151,291			92,883		282,930			176,463

Gain on sale of business		—			74,856		—			74,856
Interest and other expense, net		2,747			9,767		7,644			16,062

Income before income taxes		148,544			157,972		275,286			235,257
Provision for income taxes		25,682			37,532		47,303			49,757

Net income	$	122,862		$	120,440	$	227,983		$	185,500

The following is capital expenditures by reportable segment for the three and six months ended June 30, 2018 and 2017:


	Vacuum & Analysis		Light & Motion		Total
Three Months Ended June 30, 2018:
Capital expenditures	$	6,972	$	5,456	$	12,428

Six Months Ended June 30, 2018:
Capital expenditures	$	13,169	$	8,649	$	21,818


Three Months Ended June 30, 2017:
Capital expenditures	$	3,528	$	2,112	$	5,640

Six Months Ended June 30, 2017:
Capital expenditures	$	5,902	$	3,837	$	9,739

The following is depreciation and amortization by reportable segment for the three and six months ended June 30, 2018 and 2017:


	Vacuum & Analysis		Light & Motion		Total
Three Months Ended June 30, 2018:
Depreciation and amortization	$	4,968	$	14,917	$	19,885

Six Months Ended June 30, 2018
Depreciation and amortization	$	10,097	$	30,280	$	40,377


Three Months Ended June 30, 2017:
Depreciation and amortization	$	5,097	$	15,491	$	20,588

Six Months Ended June 30, 2017:
Depreciation and amortization	$	10,219	$	32,202	$	42,421

Total income tax expense is not presented by reportable segment because the necessary information is not available or used by the CODM.

The following are segment assets by reportable segment:


June 30, 2018:	Vacuum & Analysis		Light & Motion		Corporate, Eliminations & Other			Total
Segment assets:
Accounts receivable	$	227,639	$	127,553	$	(15,234	)	$	339,958
Inventory, net		227,635		157,294		—			384,929

Total segment assets	$	455,274	$	284,847	$	(15,234	)	$	724,887


December 31, 2017:	Vacuum & Analysis		Light & Motion		Corporate, Eliminations & Other			Total
Segment assets:
Accounts receivable	$	201,318	$	119,934	$	(20,944	)	$	300,308
Inventory, net		197,831		141,250		—			339,081

Total segment assets	$	399,149	$	261,184	$	(20,944	)	$	639,389

A reconciliation of segment assets to consolidated total assets is as follows:


	June 30, 2018		December 31, 2017
Total segment assets	$	724,887	$	639,389
Cash and cash equivalents, restricted cash and investments		641,593		553,976
Other current assets		61,720		53,543
Property, plant and equipment, net		174,054		171,782
Goodwill and intangible assets, net		931,402		957,445
Other assets		39,832		37,883

Consolidated total assets	$	2,573,488	$	2,414,018

Geographic

Information about the Company’s operations in different geographic regions is presented in the tables below. Net revenues to unaffiliated customers are based on the location in which the sale originated. Transfers between geographic areas are at tax transfer prices and have been eliminated from consolidated net revenues.


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Net revenues:
United States	$	281,818	$	244,649	$	558,538	$	462,699
Korea		66,983		59,827		120,994		104,705
Japan		54,087		36,865		112,361		74,657
Asia (excluding Korea and Japan)		107,193		91,630		208,577		179,873
Europe		63,059		47,786		126,945		95,976

	$	573,140	$	480,757	$	1,127,415	$	917,910


Long-lived assets:⁽¹⁾	June 30, 2018		December 31, 2017
United States	$	132,097	$	124,689
Europe		26,622		28,820
Asia		49,078		49,645

	$	207,797	$	203,154

(1)

Long-lived assets include property, plant and equipment, net and certain other long-term assets, excluding long-term tax related accounts.

Goodwill associated with each of the Company’s reportable segments is as follows:


	June 30, 2018		December 31, 2017
Reportable segment:
Vacuum & Analysis	$	197,152	$	197,617
Light & Motion		391,566		393,430

Total goodwill	$	588,718	$	591,047

Worldwide Product Information

Because the reportable segment information above does not reflect worldwide sales of the Company’s products, the Company groups its products into six groups of similar products based upon the similarity of product function. The following table sets forth worldwide net revenue for each group of products:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Analytical and Control Solutions Products	$	31,493	$	32,801	$	65,205	$	64,621
Power, Plasma and Reactive Gas Solutions Products		187,765		142,639		354,817		265,439
Vacuum Solutions Products		149,070		134,379		296,650		257,743
Lasers Products		70,663		52,299		145,460		97,243
Optics Products		57,200		50,706		111,579		97,211
Photonics Products		76,949		67,933		153,704		135,653

	$	573,140	$	480,757	$	1,127,415	$	917,910

Sales of Analytical and Control Solutions Products; Power, Plasma and Reactive Gas Solutions Products; and Vacuum Solutions Products are included in the Company’s Vacuum & Analysis segment. Sales of Laser Products; Optics Products; and Photonics Products are included in the Light & Motion segment.

Major Customers

The Company had two customers with net revenues greater than 10% of total net revenues in the periods shown below:


	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
LAM Research Corporation		13.1	%		10.8	%		12.8	%		11.6	%
Applied Materials, Inc.		12.9	%		13.0	%		12.5	%		13.0	%

Restructuring

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring

18)	Restructuring

During the six months ended June 30, 2018 and 2017, the Company recorded restructuring charges of $2,010 and $2,586, respectively. The restructuring charges for the six months ended June 30, 2018 primarily related to severance costs related to streamlining and consolidating certain administrative functions. The restructuring charges for the six months ended June 30, 2017 relate to the restructuring of one of the Company’s international facilities and the consolidation of certain sales offices.

Restructuring activities were as follows:


	Six Months Ended June 30,
	2018			2017
Beginning of period	$	3,244		$	540
Charged to expense		2,010			2,586
Payments and adjustments		(2,727	)		(586	)

End of period	$	2,527		$	2,540

Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

19)	Commitments and Contingencies

On March 9, 2016, a putative class action lawsuit captioned Dixon Chung v. Newport Corp., et al., Case No. A-16-733154-C, was filed in the District Court, Clark County, Nevada on behalf of a putative class of stockholders of Newport for claims related to the Merger Agreement between the Company, Newport, and Merger Sub. On March 25, 2016, a second putative class action complaint captioned Hubert C. Pincon v. Newport Corp., et al., Case No. A-16-734039-B, was filed in the District Court, Clark County, Nevada, on behalf of a putative class of Newport’s stockholders for claims related to the Merger Agreement. The lawsuits named as defendants the Company, Newport, Merger Sub, and certain then current and former members of Newport’s board of directors. Both complaints alleged that the directors breached their fiduciary duties to Newport’s stockholders by agreeing to sell Newport through an inadequate and unfair process, which led to inadequate and unfair consideration, by agreeing to unfair deal protection devices, and by omitting material information from the proxy statement. The complaints also alleged that the Company, Newport, and Merger Sub aided and abetted the directors’ alleged breaches of their fiduciary duties. The complaints sought injunctive relief, including to enjoin or rescind the Merger Agreement, and an award of attorneys’ and other fees and costs, among other relief. On April 14, 2016, the Court granted plaintiffs’ motion to consolidate the Pincon and Chung actions.

On October 19, 2016, plaintiffs filed an amended complaint captioned In re Newport Corporation Shareholder Litigation, Case No. A-16-733154-B, in the District Court, Clark County, Nevada, on behalf of a putative class of Newport’s stockholders for claims related to the Merger Agreement. The complaint named as defendants the Company, Newport, and the then-current members of Newport’s former board of directors. It alleged that the named directors breached their fiduciary duties to Newport’s stockholders by agreeing to sell Newport through an inadequate and unfair process, which led to inadequate and unfair consideration, by agreeing to unfair deal protection devices, and by omitting material information from the proxy statement. The complaint also alleged that the Company and Newport aided and abetted the named directors’ alleged breaches of their fiduciary duties. The complaint sought monetary damages, including pre- and post-judgment interest. On December 9, 2016, defendants filed motions to dismiss the amended complaint, which plaintiffs opposed. On June 22, 2017, the Court dismissed the amended complaint against all defendants but granted plaintiffs leave to amend.

On July 27, 2017, plaintiffs filed a second amended complaint, which names as defendants certain former directors of Newport. On August 8, 2017, the Court dismissed the Company and Newport from the action pursuant to stipulations among the parties. The second amended complaint alleges that the directors breached their fiduciary duties to Newport’s stockholders by agreeing to sell Newport through an inadequate and unfair process, which led to inadequate and unfair consideration, and by omitting material information from the proxy statement. The second amended complaint seeks monetary damages, including pre- and post-judgment interest. On September 1, 2017 the Newport directors filed a motion to dismiss the second amended complaint, which plaintiffs opposed. The Court held a hearing on the motion to dismiss on December 7, 2017. On January 5, 2018, the Court entered an order denying the motion to dismiss. The Newport directors answered the second amended complaint, denying the material allegations of the complaint and asserting defenses, on February 20, 2018. On May 17, 2018, plaintiff Hubert C. Pincon filed a motion to certify a putative class of former Newport stockholders and appoint Mr. Pincon as the sole representative of the proposed class. On June 11, 2018, plaintiff Dixon Chung was voluntarily dismissed from the litigation. On July 3, 2018, Mr. Pincon filed an amended motion for class certification seeking to have purported class member Locals 302 and 612 of the International Union of Operating Engineers-Employers Construction Industry Retirement Trust appointed as an additional class representative.

On May 23, 2018, the Company received a third-party subpoena duces tecum requesting documents and a deposition on various topics in the state of Massachusetts. The Company served plaintiffs with objections and responses to the subpoena on June 6, 2018. Discovery negotiations are ongoing.

The Company is subject to various legal proceedings and claims, which have arisen in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on the Company’s results of operations, financial condition or cash flows.

Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Revised Presentation of Previously Issued Financial Statements


	Three Months Ended June 30, 2017
	As previously reported		Adjustment			As reclassified
Net revenues:
Products	$	431,950	$	(5,633	)	$	426,317
Services		48,807		5,633			54,440

Total net revenues		480,757		—			480,757

Cost of revenues:
Cost of products		229,304		1,402			230,706
Cost of services		31,870		(1,402	)		30,468

Total cost of revenues	$	261,174	$	—		$	261,174


	Six Months Ended June 30, 2017
	As previously reported		Adjustment			As reclassified
Net revenues:
Products	$	824,872	$	(10,617	)	$	814,255
Services		93,038		10,617			103,655

Total net revenues		917,910		—			917,910

Cost of revenues:
Cost of products		434,364		2,176			436,540
Cost of services		58,416		(2,176	)		56,240

Total cost of revenues	$	492,780	$	—		$	492,780

Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Deferred Revenue by Arrangement

A rollforward of the Company’s deferred revenue is as follows:


	Six Months Ended June 30, 2018
Beginning balance, January 1⁽¹⁾	$	14,448
Amount of deferred revenue recognized in income		(10,092	)
Additions to deferred revenue		9,924

Ending balance, June 30⁽²⁾	$	14,280

⁽¹⁾

Beginning deferred revenue as of January 1, 2018 included $11,322 of current deferred revenue and $3,126 of long-term deferred revenue.

⁽²⁾

Ending deferred revenue as of June 30, 2018 included $10,729 of current deferred revenue and $3,551 of long-term deferred revenue.

Summary of Revenue from Contracts with Customers

The following table summarizes revenue from contracts with customers:


	Three Months Ended June 30, 2018
	Vacuum & Analysis		Light & Motion		Total
Net revenues:
Products	$	321,454	$	188,545	$	509,999
Services		46,874		16,267		63,141

Total net revenues	$	368,328	$	204,812	$	573,140

	Three Months Ended June 30, 2017
	Vacuum & Analysis		Light & Motion		Total
Net revenues:
Products	$	269,665	$	156,652	$	426,317
Services		40,296		14,144		54,440

Total net revenues	$	309,961	$	170,796	$	480,757


	Six Months Ended June 30, 2018
	Vacuum & Analysis		Light & Motion		Total
Net revenues:
Products	$	625,790	$	380,886	$	1,006,676
Services		90,882		29,857		120,739

Total net revenues	$	716,672	$	410,743	$	1,127,415


	Six Months Ended June 30, 2017
	Vacuum & Analysis		Light & Motion		Total
Net revenues:
Products	$	511,120	$	303,135	$	814,255
Services		76,825		26,830		103,655

Total net revenues	$	587,945	$	329,965	$	917,910

Investments (Tables)

6 Months Ended

Jun. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Short-Term and Long-Term Investments Available-for-Sale and Cost Method Investments

The fair value of investments classified as short-term consists of the following:


	June 30, 2018		December 31, 2017
Available-for-sale investments:
Time deposits and certificates of deposit	$	18,455	$	9,757
Bankers’ acceptance drafts		2,522		5,330
Asset-backed securities		34,727		36,990
Commercial paper		25,925		13,750
Corporate obligations		66,663		77,821
Municipal bonds		2,615		1,970
U.S. treasury obligations		31,434		28,078
U.S. agency obligations		21,345		35,738

	$	203,686	$	209,434

Investments classified as long-term consist of the following:


	June 30, 2018		December 31, 2017
Available-for-sale investments:
Group insurance contracts	$	6,076	$	6,255
Cost method investments:
Minority interest in a private company		4,400		4,400

	$	10,476	$	10,655

Gross Unrealized Gains and (Losses) Aggregated by Investment Category

The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:


As of June 30, 2018:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit	$	18,452	$	3	$	—		$	18,455
Bankers’ acceptance drafts		2,522		—		—			2,522
Asset-backed securities		34,760		9		(42	)		34,727
Commercial paper		26,337		—		(412	)		25,925
Corporate obligations		66,632		59		(28	)		66,663
Municipal bonds		2,620		—		(5	)		2,615
U.S. treasury obligations		31,418		16		—			31,434
U.S. agency obligations		21,341		5		(1	)		21,345

	$	204,082	$	92	$	(488	)	$	203,686


As of June 30, 2018:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Long-term investments:
Available-for-sale investments:
Group insurance contracts	$	6,051	$	25	$	—		$	6,076


As of December 31, 2017:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit	$	9,756	$	1	$	—		$	9,757
Bankers acceptance drafts		5,330		—		—			5,330
Asset-backed securities		37,017		15		(42	)		36,990
Commercial paper		13,810		—		(60	)		13,750
Corporate obligations		77,788		58		(25	)		77,821
Municipal bonds		1,970		—		—			1,970
U.S. treasury obligations		28,054		24		—			28,078
U.S. agency obligations		35,728		10		—			35,738

	$	209,453	$	108	$	(127	)	$	209,434


As of December 31, 2017:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Long-term investments:
Available-for-sale investments:
Group insurance contracts	$	6,006	$	249	$	—		$	6,255

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis

Assets and liabilities of the Company are measured at fair value on a recurring basis as of June 30, 2018 and are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	June 30, 2018		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	13,636	$	13,636	$	—	$	—
Time deposits and certificates of deposit		2,000		—		2,000		—
Commercial paper		14,433		—		14,433		—
Corporate obligations		1,560		—		1,560		—
U.S. agency obligations		10,847		—		10,847		—
Restricted cash – money market funds		114		114		—		—
Available-for-sale investments:
Time deposits and certificates of deposit		18,455		—		18,455		—
Bankers acceptance drafts		2,522		—		2,522		—
Asset-backed securities		34,727		—		34,727		—
Commercial paper		25,925		—		25,925		—
Corporate obligations		66,663		—		66,663		—
Municipal bonds		2,615		—		2,615		—
U.S. treasury obligations		31,434		—		31,434		—
U.S. agency obligations		21,345		—		21,345		—
Group insurance contracts		6,076		—		6,076		—
Derivatives – foreign exchange contracts		3,666		—		3,666		—
Funds in investments and other assets:
Israeli pension assets		15,796		—		15,796		—
Derivatives – interest rate hedge – non-current		8,565		—		8,565		—

Total assets	$	280,379	$	13,750	$	266,629	$	—

Liabilities:

Derivatives – foreign exchange contracts	$	822	$	—	$	822	$	—

Reported as follows:
Assets:
Cash and cash equivalents⁽¹⁾	$	42,476	$	13,636	$	28,840	$	—
Restricted cash		114		114		—		—
Short-term investments		203,686		—		203,686		—
Other current assets		3,666		—		3,666		—

Total current assets	$	249,942	$	13,750	$	236,192	$	—

Long-term investments⁽²⁾	$	6,076	$	—	$	6,076	$	—
Other assets		24,361		—		24,361		—

Total long-term assets	$	30,437	$	—	$	30,437	$	—

Liabilities:

Other current liabilities	$	822	$	—	$	822	$	—

⁽¹⁾	The cash and cash equivalent amounts presented in the table above do not include cash of $384,841 as of June 30, 2018.

⁽²⁾	The long-term investments presented in the table above do not include the Company’s minority interest investment in a private company, which is accounted for under the cost method.

Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2017 and are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	December 31, 2017		Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	4,987	$	4,987	$	—	$	—
Time deposits and certificates of deposit		2,100		—		2,100		—
Commercial paper		30,475		—		30,475		—
Restricted cash – money market funds		119		119		—		—
Available-for-sale investments:
Time deposits and certificates of deposit		9,757		—		9,757		—
Bankers acceptance drafts		5,330		—		5,330		—
Asset-backed securities		36,990		—		36,990		—
Commercial paper		13,750		—		13,750		—
Corporate obligations		77,821		—		77,821		—
Municipal bonds		1,970		—		1,970		—
U.S. treasury obligations		28,078		—		28,078		—
U.S. agency obligations		35,738		—		35,738		—
Group insurance contracts		6,255		—		6,255		—
Derivatives – foreign exchange contracts		168		—		168		—
Funds in investments and other assets:
Israeli pension assets		15,048		—		15,048		—
Derivatives – interest rate hedge – non-current		6,179		—		6,179		—

Total assets	$	274,765	$	5,106	$	269,659	$	—

Liabilities:
Derivatives – foreign exchange contracts	$	6,198	$	—	$	6,198	$	—

Total liabilities	$	6,198	$	—	$	6,198	$	—

Assets:
Cash and cash equivalents⁽¹⁾	$	37,562	$	4,987	$	32,575	$	—
Restricted cash		119		119		—		—
Short-term investments		209,434		—		209,434		—
Other current assets		168		—		168		—

Total current assets	$	247,283	$	5,106	$	242,177	$	—

Long-term investments⁽²⁾	$	6,255	$	—	$	6,255	$	—
Other assets		21,227		—		21,227		—

Total long-term assets	$	27,482	$	—	$	27,482	$	—

Liabilities:
Other current liabilities	$	6,198	$	—	$	6,198	$	—

⁽¹⁾	The cash and cash equivalent amounts presented in the table above do not include cash of $292,808 and non-negotiable time deposits of $3,398 as of December 31, 2017.

⁽²⁾	The long-term investments presented in the table above do not include the Company’s minority interest investment in a private company, which is accounted for under the cost method.

Derivatives (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Primary Net Hedging Positions and Corresponding Fair Values

The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of June 30, 2018 and December 31, 2017:


	June 30, 2018
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value⁽¹⁾
U.S. Dollar/Japanese Yen	$	47,023	$	416
U.S. Dollar/South Korean Won		73,485		1,226
U.S. Dollar/Euro		26,059		435
U.S. Dollar/U.K. Pound Sterling		12,763		250
U.S. Dollar/Taiwan Dollar		18,997		517

Total	$	178,327	$	2,844


	December 31, 2017
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value⁽¹⁾
U.S. Dollar/Japanese Yen	$	70,175	$	(233	)
U.S. Dollar/South Korean Won		79,672		(3,799	)
U.S. Dollar/Euro		26,140		(1,047	)
U.S. Dollar/U.K. Pound Sterling		12,104		(337	)
U.S. Dollar/Taiwan Dollar		20,831		(614	)

Total	$	208,922	$	(6,030	)

⁽¹⁾	Represents the receivable (payable) amount included in the consolidated balance sheet.

Summary of Fair Value Amounts of Company's Derivative Instruments

The following table provides a summary of the fair value amounts of the Company’s derivative instruments:


Derivatives Designated as Hedging Instruments	June 30, 2018			December 31, 2017
Derivative assets:
Foreign exchange contracts⁽¹⁾	$	3,666		$	168
Foreign currency interest rate hedge⁽²⁾		8,565			6,179
Derivative liabilities:
Foreign exchange contracts⁽¹⁾		(822	)		(6,198	)

Total net derivative asset designated as hedging instruments	$	11,409		$	149

⁽¹⁾

⁽²⁾	The interest rate hedge assets of $8,565 and $6,179 as of June 30, 2018 and December 31, 2017, respectively, are classified in other assets in the consolidated balance sheet.

Summary of Gains (Losses) on Derivatives Designated as Cash Flow Hedging Instruments

The following table provides a summary of the gains (losses) on derivatives designated as cash flow hedging instruments:


	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Derivatives Designated as Cash Flow Hedging Instruments
Forward exchange contracts:
Net gain (loss) recognized in OCI⁽¹⁾	$	10,079		$	29		$	10,145		$	(4,242	)
Net loss reclassified from accumulated OCI into income⁽²⁾	$	(2,648	)	$	(934	)	$	(5,188	)	$	(482	)

⁽¹⁾	Net change in the fair value of the effective portion classified in OCI.

⁽²⁾	Effective portion classified in cost of products for the three and six months ended June 30, 2018 and 2017. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial.

Summary of Gains (Losses) on Derivatives Not Designated as Cash Flow Hedging Instruments

The following table provides a summary of the gains (losses) on derivatives not designated as hedging instruments:


	Three Months Ended June 30,					Six Months Ended June 30,
	2018		2017			2018		2017
Derivatives Not Designated as Hedging Instruments
Forward exchange contracts:
Net loss recognized in income⁽¹⁾	$	1,375	$	(219	)	$	122	$	(1,682	)

⁽¹⁾

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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+ Details

Inventories, net (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consist of the following:


	June 30, 2018		December 31, 2017
Raw materials	$	221,914	$	191,351
Work-in-process		63,372		54,050
Finished goods		99,643		93,680

	$	384,929	$	339,081

Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

The changes in the carrying amount of goodwill and accumulated impairment (loss) during the six months ended June 30, 2018 and year ended December 31, 2017 were as follows:


	Six Months Ended June 30, 2018									Twelve Months Ended December 31, 2017
	Gross Carrying Amount			Accumulated Impairment (Loss)			Net			Gross Carrying Amount			Accumulated Impairment (Loss)			Net
Beginning balance at January 1	$	735,323		$	(144,276	)	$	591,047		$	727,999		$	(139,414	)	$	588,585
Sale of business⁽¹⁾		—			—			—			(3,115	)		—			(3,115	)
Impairment loss⁽²⁾		—			—			—			—			(4,862	)		(4,862	)
Foreign currency translation		(2,329	)		—			(2,329	)		10,439			—			10,439

Ending balance at June 30, 2018 and December 31, 2017	$	732,994		$	(144,276	)	$	588,718		$	735,323		$	(144,276	)	$	591,047

⁽¹⁾	In 2017, the Company sold its Data Analytics Solutions business and, as a result, charged the related goodwill of $(3,115) to the gain on sale of business.

⁽²⁾	In 2017, the Company recorded an impairment loss of $(4,862) related to the write-off of goodwill related to the discontinuation of a product line and consolidation of two manufacturing plants.

Intangible Assets

Components of the Company’s intangible assets are comprised of the following:


As of June 30, 2018:	Gross		Impairment Charges⁽¹⁾			Accumulated Amortization			Foreign Currency Translation		Net
Completed technology	$	172,431	$	(105	)	$	(126,383	)	$	26	$	45,969
Customer relationships		282,744		(1,406	)		(54,712	)		550		227,176
Patents, trademarks, trade names and other		110,523		—			(40,985	)		1		69,539

	$	565,698	$	(1,511	)	$	(222,080	)	$	577	$	342,684


As of December 31, 2017:	Gross		Impairment Charges⁽¹⁾			Accumulated Amortization			Foreign Currency Translation			Net
Completed technology	$	172,431	$	(105	)	$	(115,371	)	$	333		$	57,288
Customer relationships		282,744		(1,406	)		(45,518	)		1,571			237,391
Patents, trademarks, trade names and other		110,523		—			(38,730	)		(74	)		71,719

	$	565,698	$	(1,511	)	$	(199,619	)	$	1,830		$	366,398

⁽¹⁾	In 2017, the Company recorded impairment charges of $1,511 related to the write-off of intangible assets as a result of the discontinuation of a product line and consolidation of two manufacturing plants.

Estimated Net Amortization Expense

Aggregate net amortization expense related to acquired intangible assets and unfavorable lease commitments for future years is as follows:


Year	Amount
2018 (remaining)	$	21,475
2019		40,182
2020		28,152
2021		20,272
2022		17,645
2023		17,280
Thereafter		139,195

Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of Short-Term Debt


	June 30, 2018		December 31, 2017
Short-term debt:
Japanese lines of credit	$	11,862	$	2,750
Japanese receivables financing facility		—		215
Austrian loans due through March 2019		646		—
Other debt		3		7

	$	12,511	$	2,972

Schedule of Long-Term Debt


	June 30, 2018		December 31, 2017
Long-term debt:
Austrian loans due through March 2020	$	50	$	714
Term Loan Facility, net⁽¹⁾		342,046		389,279

	$	342,096	$	389,993

⁽¹⁾	Net of deferred financing fees, original issuance discount and repricing fee of $6,418 and $9,185 as of June 30, 2018 and December 31, 2017, respectively.

Schedule of Contractual Maturities of Debt Obligations

Contractual maturities of the Company’s debt obligations as of June 30, 2018 are as follows:


Year	Amount
2018 (remaining)	$	11,877
2019		634
2020		50
2021		—
2022		—
Thereafter		348,464

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

Product Warranties (Tables)

6 Months Ended

Jun. 30, 2018

Guarantees and Product Warranties [Abstract]

Product Warranty Activities

Product warranty activities were as follows:


	Six Months Ended June 30,
	2018			2017
Beginning of period	$	10,104		$	8,261
Provision for product warranties		8,484			7,555
Direct and other charges to warranty liability		(7,328	)		(6,084	)

End of period⁽¹⁾	$	11,260		$	9,732

⁽¹⁾

Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Income Per Share

The following table sets forth the computation of basic and diluted net income per share:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Numerator:
Net income	$	122,862	$	120,440	$	227,983	$	185,500

Denominator:
Shares used in net income per common share – basic		54,719,000		54,178,000		54,571,000		53,973,000
Effect of dilutive securities:
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan		555,000		823,000		709,000		1,006,000

Shares used in net income per common share – diluted		55,274,000		55,001,000		55,280,000		54,979,000

Net income per common share:
Basic	$	2.25	$	2.22	$	4.18	$	3.44
Diluted	$	2.22	$	2.19	$	4.12	$	3.37

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income

The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cost of revenues	$	1,489	$	1,187	$	2,494	$	2,117
Research and development expense		819		827		1,541		1,572
Selling, general and administrative expense		4,058		4,193		12,757		11,300

Total pre-tax stock-based compensation expense	$	6,366	$	6,207	$	16,792	$	14,989

Summary of Activity for RSUs

The following table presents the activity for RSUs under the Plan:


	Six Months Ended June 30, 2018
	Outstanding RSUs			Weighted Average Grant Date Fair Value
RSUs – beginning of period		943,379		$	47.57
Accrued dividend shares		31		$	115.65
Granted		259,597		$	112.56
Vested		(478,238	)	$	44.21
Forfeited		(33,889	)	$	60.77

RSUs – end of period		689,880		$	73.71

Stock Appreciation Rights (SARs) [Member]

Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights

The following table presents the activity for SARs under the Plan:


	Six Months Ended June 30, 2018
	Outstanding SARs			Weighted Average Grant Date Fair Value
SARs – beginning of period		282,907		$	28.62
Exercised		(79,767	)	$	28.91
Forfeited or expired		(1,950	)	$	29.00

SARs Outstanding – end of period		201,190		$	28.50

Business Segment, Geographic Area, Product and Significant Customer Information (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Net Revenues, Assets and Goodwill by Reportable Segment

The following are net revenues by reportable segment:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Vacuum & Analysis	$	368,328	$	309,961	$	716,672	$	587,945
Light & Motion		204,812		170,796		410,743		329,965

	$	573,140	$	480,757	$	1,127,415	$	917,910

The following are segment assets by reportable segment:


June 30, 2018:	Vacuum & Analysis		Light & Motion		Corporate, Eliminations & Other			Total
Segment assets:
Accounts receivable	$	227,639	$	127,553	$	(15,234	)	$	339,958
Inventory, net		227,635		157,294		—			384,929

Total segment assets	$	455,274	$	284,847	$	(15,234	)	$	724,887


December 31, 2017:	Vacuum & Analysis		Light & Motion		Corporate, Eliminations & Other			Total
Segment assets:
Accounts receivable	$	201,318	$	119,934	$	(20,944	)	$	300,308
Inventory, net		197,831		141,250		—			339,081

Total segment assets	$	399,149	$	261,184	$	(20,944	)	$	639,389

Goodwill associated with each of the Company’s reportable segments is as follows:


	June 30, 2018		December 31, 2017
Reportable segment:
Vacuum & Analysis	$	197,152	$	197,617
Light & Motion		391,566		393,430

Total goodwill	$	588,718	$	591,047

Reconciliation of Segment Gross Profit to Consolidated Net Income

The following is a reconciliation of segment gross profit to consolidated net income:


	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
Gross profit by reportable segment:
Vacuum & Analysis	$	171,082		$	139,867	$	329,582		$	268,790
Light & Motion		103,795			79,716		208,150			156,340

Total gross profit by reportable segment		274,877			219,583		537,732			425,130
Operating expenses:
Research and development		36,504			33,680		71,361			66,962
Selling, general and administrative		76,559			71,979		159,508			146,199
Acquisition and integration costs		(1,168	)		790		(1,168	)		2,232
Restructuring		790			2,064		2,010			2,586
Asset impairment		—			6,719		—			6,719
Environmental Costs		—			—		1,000			—
Amortization of intangible assets		10,901			11,468		22,091			23,969

Income from operations		151,291			92,883		282,930			176,463

Gain on sale of business		—			74,856		—			74,856
Interest and other expense, net		2,747			9,767		7,644			16,062

Income before income taxes		148,544			157,972		275,286			235,257
Provision for income taxes		25,682			37,532		47,303			49,757

Net income	$	122,862		$	120,440	$	227,983		$	185,500

Schedule of Capital Expenditures, Depreciation and Amortization Expense by Reportable Segment

The following is capital expenditures by reportable segment for the three and six months ended June 30, 2018 and 2017:


	Vacuum & Analysis		Light & Motion		Total
Three Months Ended June 30, 2018:
Capital expenditures	$	6,972	$	5,456	$	12,428

Six Months Ended June 30, 2018:
Capital expenditures	$	13,169	$	8,649	$	21,818


Three Months Ended June 30, 2017:
Capital expenditures	$	3,528	$	2,112	$	5,640

Six Months Ended June 30, 2017:
Capital expenditures	$	5,902	$	3,837	$	9,739

The following is depreciation and amortization by reportable segment for the three and six months ended June 30, 2018 and 2017:


	Vacuum & Analysis		Light & Motion		Total
Three Months Ended June 30, 2018:
Depreciation and amortization	$	4,968	$	14,917	$	19,885

Six Months Ended June 30, 2018
Depreciation and amortization	$	10,097	$	30,280	$	40,377


Three Months Ended June 30, 2017:
Depreciation and amortization	$	5,097	$	15,491	$	20,588

Six Months Ended June 30, 2017:
Depreciation and amortization	$	10,219	$	32,202	$	42,421

Reconciliation of Segment Assets to Consolidated Total Assets

A reconciliation of segment assets to consolidated total assets is as follows:


	June 30, 2018		December 31, 2017
Total segment assets	$	724,887	$	639,389
Cash and cash equivalents, restricted cash and investments		641,593		553,976
Other current assets		61,720		53,543
Property, plant and equipment, net		174,054		171,782
Goodwill and intangible assets, net		931,402		957,445
Other assets		39,832		37,883

Consolidated total assets	$	2,573,488	$	2,414,018

Schedule of Net Revenues and Long-Lived Assets by Geographic Regions

Transfers between geographic areas are at tax transfer prices and have been eliminated from consolidated net revenues.


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Net revenues:
United States	$	281,818	$	244,649	$	558,538	$	462,699
Korea		66,983		59,827		120,994		104,705
Japan		54,087		36,865		112,361		74,657
Asia (excluding Korea and Japan)		107,193		91,630		208,577		179,873
Europe		63,059		47,786		126,945		95,976

	$	573,140	$	480,757	$	1,127,415	$	917,910


Long-lived assets:⁽¹⁾	June 30, 2018		December 31, 2017
United States	$	132,097	$	124,689
Europe		26,622		28,820
Asia		49,078		49,645

	$	207,797	$	203,154

(1)

Long-lived assets include property, plant and equipment, net and certain other long-term assets, excluding long-term tax related accounts.

Worldwide Net Revenue for Each Group of Products

The following table sets forth worldwide net revenue for each group of products:


	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Analytical and Control Solutions Products	$	31,493	$	32,801	$	65,205	$	64,621
Power, Plasma and Reactive Gas Solutions Products		187,765		142,639		354,817		265,439
Vacuum Solutions Products		149,070		134,379		296,650		257,743
Lasers Products		70,663		52,299		145,460		97,243
Optics Products		57,200		50,706		111,579		97,211
Photonics Products		76,949		67,933		153,704		135,653

	$	573,140	$	480,757	$	1,127,415	$	917,910

Customers with Net Revenues Greater than 10% of Total Net Revenues

The Company had two customers with net revenues greater than 10% of total net revenues in the periods shown below:


	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
LAM Research Corporation		13.1	%		10.8	%		12.8	%		11.6	%
Applied Materials, Inc.		12.9	%		13.0	%		12.5	%		13.0	%

Restructuring (Tables)

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Schedule of Company's Restructuring Activity

Restructuring activities were as follows:


	Six Months Ended June 30,
	2018			2017
Beginning of period	$	3,244		$	540
Charged to expense		2,010			2,586
Payments and adjustments		(2,727	)		(586	)

End of period	$	2,527		$	2,540

Basis of Presentation - Revised Presentation of Previously Issued Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net revenues:
Total net revenues	$ 573,140	$ 480,757	$ 1,127,415	$ 917,910
Cost of revenues:
Total cost of revenues	298,263	261,174	589,683	492,780
Products [Member]
Net revenues:
Total net revenues	509,999	426,317	1,006,676	814,255
Cost of revenues:
Total cost of revenues	266,890	230,706	528,211	436,540
Services [Member]
Net revenues:
Total net revenues	63,141	54,440	120,739	103,655
Cost of revenues:
Total cost of revenues	$ 31,373	30,468	$ 61,472	56,240
As Previously Reported [Member]
Net revenues:
Total net revenues		480,757		917,910
Cost of revenues:
Total cost of revenues		261,174		492,780
As Previously Reported [Member] \| Products [Member]
Net revenues:
Total net revenues		431,950		824,872
Cost of revenues:
Total cost of revenues		229,304		434,364
As Previously Reported [Member] \| Services [Member]
Net revenues:
Total net revenues		48,807		93,038
Cost of revenues:
Total cost of revenues		31,870		58,416
Adjustment [Member] \| Products [Member]
Net revenues:
Total net revenues		(5,633)		(10,617)
Cost of revenues:
Total cost of revenues		1,402		2,176
Adjustment [Member] \| Services [Member]
Net revenues:
Total net revenues		5,633		10,617
Cost of revenues:
Total cost of revenues		$ (1,402)		$ (2,176)

Revenue From Contracts With Customers - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Retained earnings opening balance sheet adjustment for Topic 606 adoption	$ 1,004,698		$ 795,698
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Retained earnings opening balance sheet adjustment for Topic 606 adoption		$ 1,809
Contract assets	$ 3,298	$ 3,065
Accounting Standards Update 2014-09 [Member] \| Maximum [Member]
Disaggregation of Revenue [Line Items]
Term of installation services	14 days
Company's normal payment terms	60 days
Warranty period	24 months
Term of separately priced contracts	60 months
Accounting Standards Update 2014-09 [Member] \| Minimum [Member]
Disaggregation of Revenue [Line Items]
Company's normal payment terms	30 days
Warranty period	12 months
Term of separately priced contracts	12 months

Revenue From Contracts With Customers - Schedule of Deferred Revenue by Arrangement (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Deferred Revenue [Abstract]
Beginning balance, January 1,	$ 14,448
Amount of deferred revenue recognized in income	(10,092)
Additions to deferred revenue	9,924
Ending balance, June 30	$ 14,280

Revenue From Contracts With Customers - Schedule of Deferred Revenue by Arrangement (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Deferred Revenue [Abstract]
Deferred revenue, current	$ 10,729	$ 11,322	$ 12,842
Long-term deferred revenue	$ 3,551	$ 3,126

Revenue From Contracts With Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	$ 573,140	$ 480,757	$ 1,127,415	$ 917,910
Products [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	509,999	426,317	1,006,676	814,255
Services [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	63,141	54,440	120,739	103,655
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	368,328	309,961	716,672	587,945
Vacuum & Analysis [Member] \| Products [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	321,454	269,665	625,790	511,120
Vacuum & Analysis [Member] \| Services [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	46,874	40,296	90,882	76,825
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	204,812	170,796	410,743	329,965
Light & Motion [Member] \| Products [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	188,545	156,652	380,886	303,135
Light & Motion [Member] \| Services [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	$ 16,267	$ 14,144	$ 29,857	$ 26,830

Investments - Investments Classified as Short-Term Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 203,686	$ 209,434
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	18,455	9,757
Bankers Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	2,522	5,330
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	34,727	36,990
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	25,925	13,750
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	66,663	77,821
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	2,615	1,970
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	31,434	28,078
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 21,345	$ 35,738

Investments - Investments Classified as Long-Term Available-for-Sale Investments and Long-Term Cost Method Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities and Cost-method Investments [Line Items]
Investments classified as long-term	$ 10,476	$ 10,655
Available-for-Sale Investments [Member] \| Group Insurance Contracts [Member]
Schedule of Available-for-sale Securities and Cost-method Investments [Line Items]
Investments classified as long-term	6,076	6,255
Cost-method Investments [Member] \| Minority Interest in Private Company [Member]
Schedule of Available-for-sale Securities and Cost-method Investments [Line Items]
Investments classified as long-term	$ 4,400	$ 4,400

Investments - Gross Unrealized Gains and (Losses) Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	$ 204,082	$ 209,453
Investments, Gross Unrealized Gains	92	108
Investments, Gross Unrealized (Losses)	(488)	(127)
Investments, Estimated Fair Value	203,686	209,434
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	18,452	9,756
Investments, Gross Unrealized Gains	3	1
Investments, Estimated Fair Value	18,455	9,757
Bankers Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	2,522	5,330
Investments, Estimated Fair Value	2,522	5,330
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	34,760	37,017
Investments, Gross Unrealized Gains	9	15
Investments, Gross Unrealized (Losses)	(42)	(42)
Investments, Estimated Fair Value	34,727	36,990
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	26,337	13,810
Investments, Gross Unrealized (Losses)	(412)	(60)
Investments, Estimated Fair Value	25,925	13,750
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	66,632	77,788
Investments, Gross Unrealized Gains	59	58
Investments, Gross Unrealized (Losses)	(28)	(25)
Investments, Estimated Fair Value	66,663	77,821
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	2,620	1,970
Investments, Gross Unrealized (Losses)	(5)
Investments, Estimated Fair Value	2,615	1,970
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	31,418	28,054
Investments, Gross Unrealized Gains	16	24
Investments, Estimated Fair Value	31,434	28,078
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	21,341	35,728
Investments, Gross Unrealized Gains	5	10
Investments, Gross Unrealized (Losses)	(1)
Investments, Estimated Fair Value	21,345	35,738
Group Insurance Contracts [Member] \| Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	6,051	6,006
Investments, Gross Unrealized Gains	25	249
Investments, Estimated Fair Value	$ 6,076	$ 6,255

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities		$ 6,198
Available-for-sale investments	$ 203,686	209,434
Short-term investments	203,686	209,434
Derivatives - contracts		168
Other assets	39,832	37,883
Derivatives - liabilities		6,198
Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - contracts	3,666
Derivatives - liabilities	822
Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - contracts	8,565	6,179
Derivatives - interest rate hedge - non-current	8,565	6,179
Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	280,379	274,765
Cash and cash equivalents	42,476	37,562
Restricted cash	114	119
Short-term investments	203,686	209,434
Derivatives - contracts	3,666	168
Total current assets	249,942	247,283
Available-for-sale investments	6,076	6,255
Other assets	24,361	21,227
Total long-term assets	30,437	27,482
Derivatives - liabilities	822	6,198
Fair Value Measurements, Recurring [Member] \| Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - contracts	3,666	168
Derivatives - liabilities	822	6,198
Fair Value Measurements, Recurring [Member] \| Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - interest rate hedge - non-current	8,565	6,179
Money Market Funds [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	13,636	4,987
Restricted cash	114	119
Time Deposits and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		9,757
Time Deposits and Certificates of Deposit [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2,000	2,100
Available-for-sale investments	18,455
Bankers Acceptance Drafts [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2,522	5,330
U.S. Agency Obligations [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	10,847
Available-for-sale investments	21,345	35,738
Asset-Backed Securities [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	34,727	36,990
U.S. Treasury Obligations [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	31,434	28,078
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	13,750	5,106
Cash and cash equivalents	13,636	4,987
Restricted cash	114	119
Total current assets	13,750	5,106
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] \| Money Market Funds [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	13,636	4,987
Restricted cash	114	119
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities		6,198
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	266,629	269,659
Cash and cash equivalents	28,840	32,575
Short-term investments	203,686	209,434
Derivatives - contracts	3,666	168
Total current assets	236,192	242,177
Available-for-sale investments	6,076	6,255
Other assets	24,361	21,227
Total long-term assets	30,437	27,482
Derivatives - liabilities	822	6,198
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value Measurements, Recurring [Member] \| Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - contracts	3,666	168
Derivatives - liabilities	822	6,198
Significant Other Observable Inputs (Level 2) [Member] \| Fair Value Measurements, Recurring [Member] \| Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - interest rate hedge - non-current	8,565	6,179
Significant Other Observable Inputs (Level 2) [Member] \| Time Deposits and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		9,757
Significant Other Observable Inputs (Level 2) [Member] \| Time Deposits and Certificates of Deposit [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2,000	2,100
Available-for-sale investments	18,455
Significant Other Observable Inputs (Level 2) [Member] \| Bankers Acceptance Drafts [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2,522	5,330
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Agency Obligations [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	10,847
Available-for-sale investments	21,345	35,738
Significant Other Observable Inputs (Level 2) [Member] \| Asset-Backed Securities [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	34,727	36,990
Significant Other Observable Inputs (Level 2) [Member] \| U.S. Treasury Obligations [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	31,434	28,078
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	25,925	13,750
Commercial Paper [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	14,433	30,475
Available-for-sale investments	25,925	13,750
Commercial Paper [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	14,433	30,475
Available-for-sale investments	25,925	13,750
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	66,663	77,821
Corporate Obligations [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,560
Available-for-sale investments	66,663	77,821
Corporate Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,560
Available-for-sale investments	66,663	77,821
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2,615	1,970
Municipal Bonds [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2,615	1,970
Municipal Bonds [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2,615	1,970
Group Insurance Contracts [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	6,076	6,255
Group Insurance Contracts [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	6,076	6,255
Israeli Pension Assets [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	15,796	15,048
Israeli Pension Assets [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	$ 15,796	$ 15,048

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements	$ 384,841	$ 292,808
Non-Negotiable Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements		$ 3,398

Derivatives - Additional Information (Detail) - USD ($)		6 Months Ended
Derivatives - Additional Information (Detail) - USD ($)	Sep. 30, 2016	Jun. 30, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum period for hedging a portion of forecasted foreign currency denominated intercompany sales of inventory		18 months
Gross notional values of outstanding forward foreign exchange contracts		$ 178,327,000	$ 208,922,000
Accumulated other comprehensive income realization period		12 months
Interest Rate Hedge [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of debt which is subject to interest rate swap fixed rate	50.00%
Interest rate swap agreement, credit spread rate		1.75%
Interest rate swap agreement, maturity date	Sep. 30, 2020
Interest rate swap agreement, notional amount		$ 305,000,000	305,000,000
Interest rate swap agreement, interest rate description		The Company entered into an interest rate swap agreement to fix the rate on approximately 50% of its then-outstanding balance under the Credit Agreement, as described further in Note 10. This hedge fixes the interest rate paid on the hedged debt at 1.198% per annum plus the applicable credit spread, which was 1.75% as of June 30, 2018, through September 30, 2020.
Interest rate swap agreement, fair value		$ 8,565,000	$ 6,179,000
Cash Flow Hedging [Member] \| Interest Rate Hedge [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap agreement, interest rate	1.198%

Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 178,327	$ 208,922
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	2,844	(6,030)
Forward Exchange Contracts [Member] \| U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	47,023	70,175
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	416	(233)
Forward Exchange Contracts [Member] \| U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	73,485	79,672
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	1,226	(3,799)
Forward Exchange Contracts [Member] \| U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	26,059	26,140
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	435	(1,047)
Forward Exchange Contracts [Member] \| U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	12,763	12,104
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	250	(337)
Forward Exchange Contracts [Member] \| U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	18,997	20,831
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	$ 517	$ (614)

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative assets		$ 168
Derivative liabilities		(6,198)
Total net derivative asset designated as hedging instruments	$ 2,844	(6,030)
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset designated as hedging instruments	11,409	149
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	3,666
Derivative liabilities	(822)
Foreign Exchange Contracts [Member] \| Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	3,666	168
Derivative liabilities	(822)	(6,198)
Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	8,565	6,179
Interest Rate Hedge [Member] \| Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	$ 8,565	$ 6,179

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative asset classified in other current assets		$ 168
Derivative liability classified in other current liabilities		(6,198)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative asset classified in other current assets	$ 3,666
Derivative liability classified in other current liabilities	(822)
Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Derivative asset classified in other current assets	$ 8,565	$ 6,179

Derivatives - Summary of Gains (Losses) on Derivatives Designated as Cash Flow Hedging Instruments (Detail) - Forward Exchange Contracts [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in OCI	$ 10,079	$ 29	$ 10,145	$ (4,242)
Net loss reclassified from accumulated OCI into income(2)	$ (2,648)	$ (934)	$ (5,188)	$ (482)

Derivatives - Summary of gains (Losses) on Derivatives Not Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Forward Exchange Contracts [Member]
Derivative Instruments Gain Loss Not Designated As Hedging Instruments [Line Items]
Net loss recognized in income	$ 1,375	$ (219)	$ 122	$ (1,682)

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 221,914	$ 191,351
Work-in-process	63,372	54,050
Finished goods	99,643	93,680
Inventories	$ 384,929	$ 339,081

Dispositions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Total proceeds from sale of business unit, net of cash sold	$ 72,509				$ 72,509
Pre-tax gain	$ 74,856		$ 74,856		74,856
Net revenues		$ 573,140	$ 480,757	$ 1,127,415	$ 917,910
Data Analytics Solutions Business [Member]
Business Acquisition [Line Items]
Net revenues						$ 12,700

Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance, Goodwill Gross Carrying Amount	$ 735,323	$ 727,999
Sale of business, Gross Carrying Amount		(3,115)
Foreign currency translation, Gross Carrying Amount	(2,329)	10,439
Ending balance, Goodwill Gross Carrying Amount	732,994	735,323
Beginning balance, Accumulated Impairment (Loss)	(144,276)	(139,414)
Impairment loss, Accumulated Impairment (Loss)		(4,862)
Foreign currency translation, Accumulated Impairment (Loss)	0	0
Ending balance, Accumulated Impairment (Loss)	(144,276)	(144,276)
Beginning balance, Goodwill Net	591,047	588,585
Sale of business, Net		(3,115)
Impairment loss, Net		(4,862)
Foreign currency translation, Net	(2,329)	10,439
Ending balance, Goodwill Net	$ 588,718	$ 591,047

Goodwill and Intangible Assets - Goodwill (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Goodwill [Line Items]
Goodwill related to the sale of business unit	$ 3,115
Goodwill impairment loss	(4,862)
Data Analytics Solutions Business [Member]
Goodwill [Line Items]
Goodwill related to the sale of business unit	$ (3,115)

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 565,698	$ 565,698
Impairment Charges	(1,511)	(1,511)
Accumulated Amortization	(222,080)	(199,619)
Foreign Currency Translation	577	1,830
Intangible assets, net	342,684	366,398
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	172,431	172,431
Impairment Charges	(105)	(105)
Accumulated Amortization	(126,383)	(115,371)
Foreign Currency Translation	26	333
Intangible assets, net	45,969	57,288
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	282,744	282,744
Impairment Charges	(1,406)	(1,406)
Accumulated Amortization	(54,712)	(45,518)
Foreign Currency Translation	550	1,571
Intangible assets, net	227,176	237,391
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	110,523	110,523
Accumulated Amortization	(40,985)	(38,730)
Foreign Currency Translation	1	(74)
Intangible assets, net	$ 69,539	$ 71,719

Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment Charges	$ 1,511	$ 1,511

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 10,901	$ 11,468	$ 22,091	$ 23,969
Amortization income from unfavorable lease commitments			$ 370	$ 366

Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2018 (remaining)	$ 21,475
2019	40,182
2020	28,152
2021	20,272
2022	17,645
2023	17,280
Thereafter	$ 139,195

Debt - Additional Information (Detail)						1 Months Ended	6 Months Ended	12 Months Ended
Debt - Additional Information (Detail)	Apr. 11, 2018	Jul. 06, 2017	Dec. 14, 2016	Sep. 30, 2016 USD ($)	Jun. 09, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2018 USD ($) Institution	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Nov. 30, 2016 USD ($)
Debt Instrument [Line Items]
Applicable margin for Term Loan Credit agreement	1.75%	2.25%
Leverage ratio		1.25%
Floor rate	0.75%	0.75%
Decrease in base rate borrowings margin	0.75%	1.25%
Description of applicable margin	On April 11, 2018, the Company entered into Amendment No. 4 (the “Repricing Amendment 4") to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 4 decreased the applicable margin for the Company’s LIBOR rate term loan under the Credit Agreement to 1.75%, with a LIBOR rate floor of 0.75%. The margin for base rate borrowings decreased to 0.75% with a base rate floor of 1.75%. The period during which a prepayment premium may be required for a Repricing Transaction was reset to six months after the effective date of the Repricing Amendment 4.	The Repricing Amendment 3 decreased the applicable margin for the Company's term loan under the Credit Agreement to 2.25% for LIBOR rate loans when the Total Leverage Ratio (as defined in the Credit Agreement) was at or above 1.25:1 and decreased to 2.00% when the Total Leverage Ratio was below 1.25:1, both with a LIBOR floor of 0.75%. The margin for base rate borrowings decreased to 1.25% when the Total Leverage Ratio is at or above 1.25:1 and to 1.00% when the Total Leverage Ratio is below 1.25:1.
Base rate floor	1.75%
Interest expense							$ 9,352,000	$ 15,829,000
Interest Rate Hedge [Member]
Debt Instrument [Line Items]
Interest rate swap agreement, maturity date				Sep. 30, 2020
Interest rate swap agreement, notional amount							$ 305,000,000	305,000,000
Interest rate swap agreement, credit spread rate							1.75%
Austria [Member]
Debt Instrument [Line Items]
Interest on loans payable							Semi-annually
Japan [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit							$ 20,779,000
Number of financial institutions for available lines of credit and borrowing arrangements \| Institution							2
Aggregate borrowings expire and renewed							3 month intervals
Total borrowings outstanding							$ 6,795,000	0
Maximum [Member] \| Austria [Member]
Debt Instrument [Line Items]
Loan interest rate							2.00%
Minimum [Member] \| Austria [Member]
Debt Instrument [Line Items]
Loan interest rate							0.75%
Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit							$ 11,293,000
Revolving Lines of Credit [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Line of credit base interest rate							1.25%
Newport [Member] \| Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Total borrowings outstanding							$ 5,067,000	$ 2,965,000
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured term loan, face amount							$ 780,000,000
Debt instrument, interest rate terms							Borrowings under the Term Loan Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, and (4) a floor of 1.75%, plus, in each case, an applicable margin; or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR rate floor of 0.75%, plus an applicable margin. The Company has elected the interest rate as described in clause (b). The Credit Agreement provides that all loans will be determined by reference to the Base Rate if the LIBOR rate cannot be ascertained, if regulators impose material restrictions on the authority of a lender to make LIBOR rate loans, or for other reasons. The Term Loan Facility was issued with original issue discount of 1.00% of the principal amount thereof.
Debt instrument, issue discount percentage on principal							1.00%
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate							0.50%
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Adjusted One Month LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate							1.00%
Period of Libor measurement							1 month
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate							1.75%
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt [Member] \| LIBOR Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate							0.75%
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt Repricing Amendment 1 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					2.50%
Debt instrument, pre-payment premium percentage					1.00%
Debt instrument, pre-payment premium					$ 7,300,000
Debt instrument, prepaid principal amount					$ 50,000,000
Debt instrument, prepaid amount						$ 60,000,000
Deferred finance fees, original issue discount and re-pricing fee, gross							$ 28,747,000
Deferred finance fees, original issue discount and re-pricing fee, net							6,418,000
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt Repricing Amendment 1 [Member] \| Interest Rate Hedge [Member]
Debt Instrument [Line Items]
Interest rate swap agreement, maturity date				Sep. 30, 2020
Interest rate swap agreement, notional amount				$ 335,000,000		$ 335,000,000	$ 305,000,000
Interest rate swap agreement, interest rate				1.198%		1.198%
Interest rate swap agreement, credit spread rate							1.75%
Interest rate swap agreement, fair value							$ 8,565,000
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt Repricing Amendment 1 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, quarterly payment percentage							0.25
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt Repricing Amendment 1 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					3.50%
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt Repricing Amendment 2 [Member]
Debt Instrument [Line Items]
Secured term loan, face amount							$ 348,464,000
Debt instrument, prepaid principal amount							425,000,000		$ 50,000,000	$ 50,000,000	$ 75,000,000	$ 50,000,000	$ 50,000,000	$ 40,000,000
Debt instrument, prepaid principal amount							$ 6,536,000
Debt instrument, stated percentage							3.70%
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt Repricing Amendment 2 [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			2.75%
Newport [Member] \| Term Loan Credit Agreement [Member] \| Secured Debt Repricing Amendment 2 [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			1.75%
Newport [Member] \| Asset Based Credit Agreement [Member]
Debt Instrument [Line Items]
Debt issuance cost capitalized							$ 1,201,000
Contractual term							5 years
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured term loan, face amount							$ 50,000,000
Debt instrument, interest rate terms								Borrowings under the ABL Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, and (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, plus, in each case, an initial applicable margin of 0.75%; and (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, plus an initial applicable margin of 1.75%.
Percentage of borrowing based on eligible accounts							85.00%
Percentage of borrowing based on lower of cost or market value of certain eligible inventory							65.00%
Percentage of borrowing based on net orderly liquidation value of certain eligible inventory							85.00%
Percentage of borrowing base							30.00%
Initial commitment fee percentage							0.375%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of borrowing based on book value of certain eligible accounts							70.00%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate								0.50%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| Adjusted One Month LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate								1.00%
Period of Libor measurement								1 month
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate								1.75%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| Initial Margin Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate								0.75%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit							$ 15,000,000

Debt - Schedule of Short Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Short term debt	$ 12,511	$ 2,972
Other Debt [Member]
Short-term Debt [Line Items]
Short term debt	3	7
Japan [Member] \| Line of Credit [Member]
Short-term Debt [Line Items]
Short term debt	11,862	2,750
Japan [Member] \| Receivables Financing Facility [Member]
Short-term Debt [Line Items]
Short term debt		$ 215
Austria [Member] \| Loans Due Through March 2019 [Member]
Short-term Debt [Line Items]
Short term debt	$ 646

Debt - Schedule of Long Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long term debt	$ 342,096	$ 389,993
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Long term debt	342,046	389,279
Austria [Member] \| Loans Due Through March 2020 [Member]
Debt Instrument [Line Items]
Long term debt	$ 50	$ 714

Debt - Schedule of Long Term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Deferred financing fees, original issuance discount and re-pricing fee	$ 6,418	$ 9,185

Debt - Schedule of Contractual Maturities of Debt Obligations (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
Maturities of Long-term Debt [Abstract]
2018 (remaining)	$ 11,877
2019	634
2020	50
2021	0
2022	0
Thereafter	$ 348,464

Product Warranties - Product Warranty Activities (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Guarantees [Abstract]
Beginning of period	$ 10,104	$ 8,261
Provision for product warranties	8,484	7,555
Direct and other charges to warranty liability	(7,328)	(6,084)
End of period	$ 11,260	$ 9,732

Product Warranties - Product Warranty Activities (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Guarantees [Abstract]
Short-term product warranty	$ 10,846	$ 9,293
Long-term product warranty	$ 414	$ 439

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal corporate income tax rate		21.00%	35.00%
Adjustment to provisional tax benefit	$ 659
Adjustment increase of effective tax rate		1.00%
Effective tax rate	17.30%	17.20%
Accrued interest on unrecognized tax benefits	$ 572	$ 572	$ 327
Gross unrecognized tax benefits excluding interest and penalties	28,961	28,961	$ 27,345
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate	$ 21,491	21,491
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions		$ 1,920

Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income	$ 122,862	$ 120,440	$ 227,983	$ 185,500
Denominator:
Shares used in net income per common share - basic	54,719,000	54,178,000	54,571,000	53,973,000
Effect of dilutive securities:
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan	555,000	823,000	709,000	1,006,000
Shares used in net income per common share - diluted	55,274,000	55,001,000	55,280,000	54,979,000
Net income per common share:
Basic	$ 2.25	$ 2.22	$ 4.18	$ 3.44
Diluted	$ 2.22	$ 2.19	$ 4.12	$ 3.37

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Number of shares excluded from computation of diluted earnings per share	99,000	800	49,000	5,000

Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended				6 Months Ended
	Jul. 30, 2018	Jul. 25, 2011	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		1,770,000	0		0		0	0
Value of shares repurchased		$ 52,000,000
Cash dividends per common share			$ 0.20	$ 0.180	$ 0.18	$ 0.175	$ 0.38	$ 0.35
Dividend payment to common shareholders			$ 20,750,000	$ 20,750,000	$ 18,903,000	$ 18,903,000	$ 20,750,000	$ 18,903,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Jul. 30, 2018
Cash dividend to be paid	$ 0.20
Dividend to be paid date	Sep. 07, 2018
Dividend declared, shareholders of record date	Aug. 27, 2018

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense related to unvested stock-based awards granted to employees, officers and directors	$ 30,447
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted	259,597	376,081
Restricted stock units, weighted average grant date fair value	$ 112.56	$ 67.13
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted	0	0

Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 6,366	$ 6,207	$ 16,792	$ 14,989
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	1,489	1,187	2,494	2,117
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	819	827	1,541	1,572
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 4,058	$ 4,193	$ 12,757	$ 11,300

Stock-Based Compensation - Summary of Activity for RSUs (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs - beginning of period	943,379
Granted	259,597	376,081
Vested	(478,238)
Forfeited or expired	(33,889)
RSUs - end of period	689,880
RSUs/SARs, Weighted Average Grant Date Fair Value, Beginning of period	$ 47.57
Weighted Average Grant Date Fair Value, Granted	112.56	$ 67.13
Weighted Average Grant Date Fair Value, Vested	44.21
Weighted Average Grant Date Fair Value, Forfeited or expired	60.77
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period	$ 73.71
Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued dividend shares	31
Weighted Average Grant Date Fair Value, Accrued dividend shares	$ 115.65

Stock-Based Compensation - Summary of Activity for SARs (Detail) - Stock Appreciation Rights (SARs) [Member]	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs - beginning of period \| shares	282,907
Exercised, Outstanding SARs \| shares	(79,767)
Forfeited or expired, Outstanding SARs \| shares	(1,950)
RSUs - end of period \| shares	201,190
RSUs/SARs, Weighted Average Grant Date Fair Value, Beginning of period \| $ / shares	$ 28.62
Exercised, Weighted Average Grant Date Fair Value \| $ / shares	28.91
Forfeited or expired, Weighted Average Grant Date Fair Value \| $ / shares	29.00
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period \| $ / shares	$ 28.50

Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018 Segment Customer Product
Segment Reporting [Abstract]
Number of reportable segments \| Segment	2
Number of product groups \| Product	6
Number of customers with net revenues greater than 10% of total net revenues \| Customer	2
Entity wide net revenue major customer percentage minimum	10.00%

Business Segment, Geographic Area, Product and Significant Customer Information - Net Revenues by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total net revenues	$ 573,140	$ 480,757	$ 1,127,415	$ 917,910
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Total net revenues	368,328	309,961	716,672	587,945
Light & Motion [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 204,812	$ 170,796	$ 410,743	$ 329,965

Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Gross profit		$ 274,877	$ 219,583	$ 537,732	$ 425,130
Research and development		36,504	33,680	71,361	66,962
Selling, general and administrative		76,559	71,979	159,508	146,199
Acquisition and integration costs		(1,168)	790	(1,168)	2,232
Restructuring		790	2,064	2,010	2,586
Asset impairment			6,719		6,719
Environmental costs				1,000
Amortization of intangible assets		10,901	11,468	22,091	23,969
Income from operations		151,291	92,883	282,930	176,463
Gain on sale of business	$ 74,856		74,856		74,856
Interest and other expense, net		2,747	9,767	7,644	16,062
Income before income taxes		148,544	157,972	275,286	235,257
Provision for income taxes		25,682	37,532	47,303	49,757
Net income		122,862	120,440	227,983	185,500
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit		171,082	139,867	329,582	268,790
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit		$ 103,795	$ 79,716	$ 208,150	$ 156,340

Business Segment, Geographic Area, Product and Significant Customer Information - Schedule of Capital Expenditures, Depreciation and Amortization Expense by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 12,428	$ 5,640	$ 21,818	$ 9,739
Depreciation and amortization	19,885	20,588	40,377	42,421
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Capital expenditures	6,972	3,528	13,169	5,902
Depreciation and amortization	4,968	5,097	10,097	10,219
Light & Motion [Member]
Segment Reporting Information [Line Items]
Capital expenditures	5,456	2,112	8,649	3,837
Depreciation and amortization	$ 14,917	$ 15,491	$ 30,280	$ 32,202

Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Accounts receivable	$ 339,958	$ 300,308
Inventory, net	384,929	339,081
Total assets	2,573,488	2,414,018
Operating Segments [Member]
Segment Reporting Information [Line Items]
Accounts receivable	339,958	300,308
Inventory, net	384,929	339,081
Total assets	724,887	639,389
Operating Segments [Member] \| Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	227,639	201,318
Inventory, net	227,635	197,831
Total assets	455,274	399,149
Operating Segments [Member] \| Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	127,553	119,934
Inventory, net	157,294	141,250
Total assets	284,847	261,184
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(15,234)	(20,944)
Total assets	$ (15,234)	$ (20,944)

Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 2,573,488	$ 2,414,018
Other current assets	61,720	53,543
Property, plant and equipment, net	174,054	171,782
Other assets	39,832	37,883
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	724,887	639,389
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents, restricted cash and investments	641,593	553,976
Other current assets	61,720	53,543
Property, plant and equipment, net	174,054	171,782
Goodwill and intangible assets, net	931,402	957,445
Other assets	$ 39,832	$ 37,883

Business Segment, Geographic Area, Product and Significant Customer Information - Schedule of Net Revenues and Long-Lived Assets by Geographic Regions (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 573,140	$ 480,757	$ 1,127,415	$ 917,910
Long-lived assets	207,797		207,797		$ 203,154
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	281,818	244,649	558,538	462,699
Long-lived assets	132,097		132,097		124,689
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	66,983	59,827	120,994	104,705
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	54,087	36,865	112,361	74,657
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	107,193	91,630	208,577	179,873
Long-lived assets	26,622		26,622		28,820
Asia (Excluding Korea and Japan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	63,059	$ 47,786	126,945	$ 95,976
Long-lived assets	$ 49,078		$ 49,078		$ 49,645

Business Segment, Geographic Area, Product and Significant Customer Information - Summary of Goodwill Associated with Reportable Segments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Goodwill	$ 588,718	$ 591,047	$ 588,585
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Goodwill	197,152	197,617
Light & Motion [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 391,566	$ 393,430

Business Segment, Geographic Area, Product and Significant Customer Information - Worldwide Net Revenue for Each Group of Products (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Net sales from product groups	$ 573,140	$ 480,757	$ 1,127,415	$ 917,910
Analytical and Control Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	31,493	32,801	65,205	64,621
Power Plasma and Reactive Gas Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	187,765	142,639	354,817	265,439
Vacuum Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	149,070	134,379	296,650	257,743
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	70,663	52,299	145,460	97,243
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	57,200	50,706	111,579	97,211
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 76,949	$ 67,933	$ 153,704	$ 135,653

Business Segment, Geographic Area, Product and Significant Customer Information - Customers with Net Revenues Greater than 10% of Total Net Revenues (Detail) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member]	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Applied Materials, Inc [Member]
Revenue, Major Customer [Line Items]
Percentage of total net revenues	12.90%	13.00%	12.50%	13.00%
LAM Research Corporation [Member]
Revenue, Major Customer [Line Items]
Percentage of total net revenues	13.10%	10.80%	12.80%	11.60%

Restructuring - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Facilities	Jun. 30, 2017 USD ($) Facilities
Reorganizations [Abstract]
Restructuring charges \| $	$ 790	$ 2,064	$ 2,010	$ 2,586
Number of facilities consolidated \| Facilities			0	0

Restructuring - Schedule of Company's Restructuring Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Beginning of period			$ 3,244	$ 540
Charged to expense	$ 790	$ 2,064	2,010	2,586
Payments and adjustments			(2,727)	(586)
End of period	$ 2,527	$ 2,540	$ 2,527	$ 2,540