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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2015	Jul. 29, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
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		53,380,341

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 178,319	$ 305,437
Short-term investments	177,433	129,594
Trade accounts receivable, net	124,553	106,362
Inventories, net	165,590	155,169
Deferred income taxes	13,570	14,017
Other current assets	28,203	27,512
Total current assets	687,668	738,091
Property, plant and equipment, net	69,898	72,776
Long-term investments	256,855	157,201
Goodwill	200,212	192,381
Intangible assets, net	47,822	46,389
Other assets	17,878	17,206
Total assets	1,280,333	1,224,044
Current liabilities:
Accounts payable	34,054	34,166
Accrued compensation	23,641	26,970
Income taxes payable	8,615	6,702
Other current liabilities	45,668	35,789
Total current liabilities	111,978	103,627
Other liabilities	38,919	38,595
Commitments and contingencies (Note 18)
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; 53,367,109 and 53,154,666 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively	113	113
Additional paid-in capital	739,567	734,732
Retained earnings	395,455	349,061
Accumulated other comprehensive loss	(5,699)	(2,084)
Total stockholders' equity	1,129,436	1,081,822
Total liabilities and stockholders' equity	$ 1,280,333	$ 1,224,044

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
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
Common Stock, shares authorized	200,000,000	200,000,000
Common Stock, shares issued	53,367,109	53,154,666
Common Stock, shares outstanding	53,367,109	53,154,666

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

3 Months Ended

6 Months Ended

Jun. 30, 2015

Jun. 30, 2014

Jun. 30, 2015

Jun. 30, 2014

Net revenues:

Products

$ 188,281

$ 157,466

$ 374,377

$ 338,652

Services

29,685

27,231

57,428

52,398

Total net revenues

217,966

184,697

431,805

391,050

Cost of revenues:

Cost of products

99,849

87,513

198,501

187,724

Cost of services

19,319

17,549

37,460

34,319

Total cost of revenues (exclusive of amortization shown separately below)

119,168

105,062

235,961

222,043

Gross profit

98,798

79,635

195,844

169,007

Research and development

17,567

15,421

34,247

31,039

Selling, general and administrative

33,269

32,239

64,136

66,830

Acquisition costs

271

499

Restructuring

219

1,007

747

Amortization of intangible assets

1,709

1,044

3,380

1,454

Income from operations

46,034

30,660

93,044

68,438

Interest income

828

243

1,369

495

Interest expense

Income before income taxes

46,824

30,891

94,338

68,904

Provision for income taxes

13,604

9,667

27,332

16,435

Net income

33,220

21,224

67,006

52,469

Other comprehensive (loss) income:

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

^[1]

(332)

(682)

(1,078)

(845)

Foreign currency translation adjustments, net of tax of $0

612

1,973

(2,594)

1,994

Unrealized gain on investments, net of tax (benefit) expense

^[2]

(202)

Total comprehensive income

$ 33,298

$ 22,522

$ 63,391

$ 53,661

Net income per share:

Basic

$ 0.62

$ 0.40

$ 1.26

$ 0.98

Diluted

0.62

0.40

1.25

0.98

Cash dividends per common share

$ 0.170

$ 0.165

$ 0.335

$ 0.325

Weighted average common shares outstanding:

Basic

53,384

53,361

53,299

53,386

Diluted

53,589

53,537

53,559

53,657

[1]	Tax (benefit) was $(178) and $(428) for the three months ended June 30, 2015 and 2014, respectively. Tax (benefit) was $(387) and $(536) for the six months ended June 30, 2015 and 2014, respectively.
[2]	Tax (benefit) expense was $(108) and $4 for the three months ended June 30, 2015 and 2014, respectively. Tax expense was $21 and $28 for the six months ended June 30, 2015 and 2014, respectively.

Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Tax (benefit) on changes in value of financial instruments designated as cash flow hedges	$ (178)	$ (428)	$ (387)	$ (536)
Tax on foreign currency translation adjustments	0	0	0	0
Tax (benefit) expense on unrealized (loss) gain on investments	$ (108)	$ 4	$ 21	$ 28

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 67,006	$ 52,469
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,082	8,965
Stock-based compensation	6,778	5,998
Provision for excess and obsolete inventory	6,335	5,532
Provision for bad debt	(105)	329
Deferred income taxes	342	1,396
Excess tax benefits from stock-based compensation	(869)	(348)
Other	203	24
Changes in operating assets and liabilities:
Trade accounts receivable	(18,787)	15,842
Inventories	(18,471)	(11,804)
Income taxes	6,404	(18,235)
Other current assets	(5,964)	(3,749)
Accrued compensation	(2,439)	(19,662)
Other current and non-current liabilities	6,862	4,518
Accounts payable	(26)	(13,538)
Other assets	(155)	77
Net cash provided by operating activities	58,196	27,814
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(9,910)	(86,950)
Purchases of investments	(264,586)	(231,293)
Maturities of investments	88,857	154,505
Sales of investments	28,229	154,992
Purchases of property, plant and equipment	(5,334)	(7,255)
Other	5	135
Net cash used in investing activities	(162,739)	(15,866)
Cash flows from financing activities:
Proceeds from short-term borrowings	2,020
Payments of short-term borrowings	(2,020)
Repurchase of common stock	(4,341)	(20,809)
Net payments related to employee stock awards	(1,124)	(11)
Dividend payments to common stockholders	(17,868)	(17,326)
Excess tax benefits from stock-based compensation	869	348
Net cash used in financing activities	(22,464)	(37,798)
Effect of exchange rate changes on cash and cash equivalents	(111)	(263)
Decrease in cash and cash equivalents	(127,118)	(26,113)
Cash and cash equivalents at beginning of period	305,437	288,902
Cash and cash equivalents at end of period	$ 178,319	$ 262,789

Basis of Presentation

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Basis of Presentation

1)	Basis of Presentation

The terms “MKS” and the “Company” refer to MKS Instruments, Inc. and its subsidiaries. The interim financial data as of June 30, 2015 and for the three and six months ended June 30, 2015 and 2014 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 consolidated balance sheet presented as of December 31, 2014 has been derived from the audited consolidated financial statements as of that date. The unaudited 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 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, 2014 filed with the Securities and Exchange Commission on February 25, 2015.

The preparation of these 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 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, 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.

Reclassifications

Certain prior year amounts have been reclassified to be consistent with current year classifications.

Recently Issued Accounting Pronouncements

6 Months Ended

Jun. 30, 2015

Accounting Changes and Error Corrections [Abstract]

Recently Issued Accounting Pronouncements

2)	Recently Issued Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which supersedes all existing revenue recognition requirements, including most industry-specific guidance. The new standard requires a company to recognize revenue when it transfers goods and services to customers in an amount that reflects the consideration that the company expects to be entitled to in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and assets recognized from costs incurred to obtain or fulfill a contract. This pronouncement is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. However, in March 2015, the FASB proposed a one-year deferral and in July 2015, the FASB agreed to defer by one year the mandatory effective date of its revenue recognition standard, but will also provide entities the option to adopt it as of the original effective date. 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 has not yet selected a transition method. The Company is currently evaluating the requirements of ASU No. 2014-09 and has not yet determined its impact on the Company’s consolidated financial statements.

In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern.” Under this ASU, management will be required to assess an entity’s ability to continue as a going concern, and to provide related footnote disclosures in certain circumstances. The provisions of this ASU are effective for annual periods beginning after December 15, 2016, and for annual and interim periods thereafter. This ASU is not expected to have an impact on the Company’s financial statements or disclosures.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305

+ Details

Investments

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investments

3)	Investments

The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:


	June 30, 2015		December 31, 2014
Available-for-sale investments:
Time deposits and certificates of deposit	$	23,630	$	20,900
Asset-backed securities		155		—
Bankers’ acceptance drafts		222		82
Commercial paper		3,450		—
Corporate obligations		59,719		24,020
Municipal bonds		7,057		2,099
U.S. agency obligations		83,200		82,493

	$	177,433	$	129,594

The fair value of long-term investments with maturities of more than one year consists of the following:


	June 30, 2015		December 31, 2014
Available-for-sale investments:
Time deposits and certificates of deposit	$	—	$	48
Asset-backed securities		140,677		75,674
Corporate obligations		103,570		64,669
Municipal bonds		605		1,254
U.S. agency obligations		12,003		15,556

	$	256,855	$	157,201

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


As of June 30, 2015:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits and certificates of deposit	$	23,630	$	—	$	—		$	23,630
Asset-backed securities		256		—		(101	)		155
Bankers’ acceptance drafts		222		—		—			222
Commercial paper		3,449		1		—			3,450
Corporate obligations		59,735		7		(23	)		59,719
Municipal bonds		7,055		6		(4	)		7,057
U.S. agency obligations		83,176		25		(1	)		83,200

	$	177,523	$	39	$	(129	)	$	177,433

Long-term investments:
Asset-backed securities	$	140,695	$	50	$	(68	)	$	140,677
Corporate obligations		103,709		17		(156	)		103,570
Municipal bonds		615		—		(10	)		605
U.S. agency obligations		11,998		6		(1	)		12,003

	$	257,017	$	73	$	(235	)	$	256,855


As of December 31, 2014:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits and certificates of deposit	$	20,901	$	—	$	(1	)	$	20,900
Bankers’ acceptance drafts		82		—		—			82
Corporate obligations		24,029		2		(11	)		24,020
Municipal bonds		2,100		—		(1	)		2,099
U.S. agency obligations		82,488		14		(9	)		82,493

	$	129,600	$	16	$	(22	)	$	129,594

Long-term investments:
Time deposits and certificates of deposit	$	48	$	—	$	—		$	48
Asset-backed securities		75,778		5		(109	)		75,674
Corporate obligations		64,842		1		(174	)		64,669
Municipal bonds		1,258		—		(4	)		1,254
U.S. agency obligations		15,563		2		(9	)		15,556

	$	157,489	$	8	$	(296	)	$	157,201

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 immaterial for both the three and six months ended June 30, 2015 and 2014, respectively.

In accordance with the Company’s investment policy, no security shall have a maturity or average life longer than three years. The average duration of the portfolio shall be no more than one year. Corporate securities must have ratings of A3/A- or better. Asset-backed securities must be rated AAA. Short-term ratings of A-2/P2/F2 or higher are also permitted. With respect to compliance with these investment guidelines, the rating agencies include Moody’s Investor Service, Standard & Poor’s and Fitch Investor Service. The middle of Moody’s, Standard & Poor’s and Fitch rating shall be used to determine compliance with credit quality guidelines. If a security is rated by two rating agencies, the lower rating will apply. If only one rating exists, that rating shall be used.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Fair Value Measurements

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

4)	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, 2015 and are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	June 30, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	95,975	$	95,975	$	—	$	—
Bankers’ acceptance drafts		48		—		48		—
Available-for-sale investments:
Bankers’ acceptance drafts		222		—		222		—
Time deposits and certificates of deposit		23,630		—		23,630		—
Commercial paper		3,450		—		3,450		—
Asset-backed securities		140,832		—		140,832		—
Corporate obligations		163,289		—		163,289		—
Municipal bonds		7,662		—		7,662		—
U.S. agency obligations		95,203		—		95,203		—
Derivatives – currency forward contracts		801		—		801		—

Total assets	$	531,112	$	95,975	$	435,137	$	—

Liabilities:
Derivatives – currency forward contracts	$	535	$	—	$	535	$	—

Reported as follows:
Assets:
Cash and cash equivalents⁽¹⁾	$	96,023	$	95,975	$	48	$	—
Short-term investments		177,433		—		177,433		—
Other current assets		801		—		801		—

Total current assets	$	274,257	$	95,975	$	178,282	$	—

Long-term investments	$	256,855	$	—	$	256,855	$	—

Liabilities:
Other current liabilities	$	535	$	—	$	535	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $66,273 and non-negotiable time deposits of $16,023 as of June 30, 2015.

Assets and liabilities of the Company measured at fair value on a recurring basis as of December 31, 2014, are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	December 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	129,092	$	129,092	$	—	$	—
Bankers acceptance drafts		131		—		131		—
Corporate obligations		700		—		700		—
Available-for-sale investments:
Time deposits and certificates of deposit		20,948		—		20,948		—
Asset-backed securities		75,674		—		75,674		—
Bankers acceptance drafts		82		—		82		—
Corporate obligations		88,689		—		88,689		—
Municipal bonds		3,353		—		3,353		—
U.S. agency obligations		98,049		—		98,049		—
Derivatives – currency forward contracts		2,110		—		2,110		—

Total assets	$	418,828	$	129,092	$	289,736	$	—

Reported as follows:
Assets:
Cash and cash equivalents⁽¹⁾	$	129,923	$	129,092	$	831	$	—
Short-term investments		129,594		—		129,594		—
Other current assets		2,110		—		2,110		—

Total current assets	$	261,627	$	129,092	$	132,535	$	—

Long-term investments	$	157,201	$	—	$	157,201	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $167,517 and non-negotiable time deposits of $7,997 as of December 31, 2014.

Money Market Funds

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

Bankers’ Acceptance Drafts

Bankers’ acceptance drafts are short-term credit investments created by a non-financial firm and guaranteed by a bank. These drafts are often traded at a discount from face value and may be traded on a secondary market.

Available-For-Sale Investments

As of June 30, 2015 and December 31, 2014, available-for-sale investments consisted of time deposits and drafts denominated in the Euro currency, certificates of deposit, commercial paper, asset-backed securities (which include auto loans, credit card receivables and equipment trust receivables), bankers acceptance drafts, corporate obligations, municipal bonds and U.S. agency obligations. The Company measures its debt and equity investments at fair value.

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, which may adversely affect its operating results and financial position. When deemed appropriate, the Company minimizes its risks from foreign currency exchange rate fluctuations through the use of derivative financial instruments. The principal market in which the Company executes its foreign currency contracts 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 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, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

5)	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 contracts, to manage certain foreign currency exposure.

By nature, all financial instruments involve market and credit risks. The Company enters into derivative instruments with major investment grade financial institutions and 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.

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 other comprehensive income (loss) (“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.

To the extent the hedge accounting criteria is not met, the related foreign currency forward contracts are considered as economic hedges and changes in the fair value of these contracts are recorded immediately in earnings in the period in which they occur. These include hedges that are used to reduce exchange rate risks arising from the change in fair value of certain foreign currency denominated assets and liabilities (i.e., payables, receivables) and other economic hedges where the hedge accounting criteria were not met.

As of June 30, 2015 and December 31, 2014, the Company had outstanding forward foreign exchange contracts with gross notional values of $91,280 and $28,650, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of June 30, 2015 and December 31, 2014:


	June 30, 2015
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value⁽¹⁾ Asset/(Liability)
U.S. Dollar/Japanese Yen	$	25,695	$	392
U.S. Dollar/South Korean Won		43,030		172
U.S. Dollar/Euro		5,675		1
U.S. Dollar/U.K. Pound Sterling		4,115		(124	)
U.S. Dollar/Taiwan Dollar		12,765		(175	)

Total	$	91,280	$	266

(1)	Represents the fair value of the net asset / (liability) amount included in the consolidated balance sheet.


	December 31, 2014
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value ⁽¹⁾ Asset/(Liability)
U.S. Dollar/Japanese Yen	$	8,035	$	1,107
U.S. Dollar/South Korean Won		12,512		372
U.S. Dollar/Euro		2,060		185
U.S. Dollar/U.K. Pound Sterling		1,308		70
U.S. Dollar/Taiwan Dollar		4,735		232

Total	$	28,650	$	1,966

(1)	Represents the fair value of the net asset / (liability) amount included in the consolidated balance sheet.

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


	June 30, 2015			December 31, 2014
Derivative assets:
Forward exchange contracts	$	801		$	1,966
Derivative liabilities:
Forward exchange contracts		(535	)		—

Total net derivative asset designated as hedging instruments⁽¹⁾	$	266		$	1,966

(1)

The derivative asset of $801 and derivative liability of $(535) are classified in other current assets and other current liabilities in the consolidated balance sheet as of June 30, 2015. The derivative asset of $1,966 is classified in other current assets in the consolidated balance sheet as of December 31, 2014. 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.

The net amount of existing gains or losses as of June 30, 2015 that the Company expects to reclassify from accumulated OCI into earnings within the next twelve months is immaterial.

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


	Three Months Ended June 30,						Six Months Ended June 30,
Derivatives Designated as Cash Flow Hedging Relationships	2015			2014			2015			2014
Forward exchange contracts:
Net (loss) recognized in OCI⁽¹⁾	$	(1,430	)	$	(1,230	)	$	(3,520	)	$	(1,564	)
Net gain (loss) reclassified from accumulated OCI into income⁽²⁾	$	716		$	(76	)	$	1,909		$	(151	)

(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, 2015 and 2014. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial.

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


	Three Months Ended June 30,						Six Months Ended June 30,
Derivatives Not Designated as Hedging Instruments	2015			2014			2015			2014
Forward exchange contracts:
Net (loss) recognized in income⁽¹⁾	$	(108	)	$	(204	)	$	(10	)	$	(98	)

(1)	The Company enters into foreign exchange contracts to hedge against changes in the balance sheet for certain subsidiaries. These derivatives are not designated as hedging instruments and are recorded immediately in selling, general and administrative expenses.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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-Name Accounting Standards Codification
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+ Details

Inventories

6 Months Ended

Jun. 30, 2015

Inventory Disclosure [Abstract]

Inventories

6)	Inventories

Inventories consist of the following:


	June 30, 2015		December 31, 2014
Raw materials	$	85,067	$	81,121
Work-in-process		27,765		26,604
Finished goods		52,758		47,444

	$	165,590	$	155,169

Acquisitions

6 Months Ended

Jun. 30, 2015

Business Combinations [Abstract]

Acquisitions

7)	Acquisitions

Precisive, LLC

On March 17, 2015, the Company acquired 100% of Precisive, LLC (“Precisive”), for $12,085, net of cash acquired of $435. The purchase price includes a deferred payment amount of $2,600 to cover any potential indemnification claims, which amount will be paid to the sellers after 15 months assuming there are no indemnification claims. Precisive is an innovative developer of optical analyzers based on Tunable Filter Spectroscopy, which provide real-time gas analysis in the natural gas and hydrocarbon processing industries, including refineries, hydrocarbon processing plants, gas-to-power machines, biogas processes and fuel gas transportation and metering, while delivering customers a lower total cost of ownership.

The following table summarizes the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition:


Current assets	$	693
Non-current assets		18
Intangible assets		5,110
Goodwill		7,042

Total assets acquired		12,863

Total current liabilities assumed		(343	)

Fair value of assets acquired and liabilities assumed		12,520

Less cash acquired		(435	)

Total purchase price, net of cash acquired	$	12,085

The entire purchase price is deductible for tax purposes. The following table reflects the allocation of the acquired intangible assets and related estimates of useful lives. These acquired intangibles will be amortized on a straight-line basis, which approximates the pattern of use.


Order backlog	$	50	18 months
Customer relationships		1,430	8 years
Exclusive patent license		2,600	10 years
Trade names		210	10 years
Current developed technology		820	10 years

	$	5,110

The fair value of the acquired intangibles was determined using the income approach. This acquisition resulted in a purchase price that exceeded the estimated fair value of tangible and intangible assets, which excess was allocated to goodwill. The Company believes the amount of goodwill relative to identifiable intangible assets relates to several factors including: (1) potential buyer-specific synergies related to market opportunities for a combined product offering; (2) potential to leverage the Company’s sales force and intellectual property to attract new customers and revenue; and (3) potential to strengthen and expand into new but complementary markets, including targeting new applications such as natural gas processing, hydrocarbon processing and other oil and gas segments.

The results of this acquisition were included in the Company’s consolidated operations beginning on March 17, 2015. The pro forma consolidated statements reflecting the operating results of Precisive, had it been acquired January 1, 2014, would not differ materially from the operating results of the Company as reported for the three and six months ended June 30, 2015. Precisive is included in the Company’s Instruments, Control and Vacuum Products group and the Advanced Manufacturing Capital Equipment reportable segment. The revenue and net earnings from Precisive, since the date of acquisition through the period ended June 30, 2015, were immaterial.

Granville-Phillips

On May 30, 2014, the Company acquired Granville-Phillips (“GP”), a division of Brooks Automation, Inc. (“Brooks”), for $86,950. GP is a leading global provider of vacuum measurement and control instruments to the semiconductor, thin film and general industrial markets. The acquisition aligns with the Company’s current strategy to grow its semiconductor business, while diversifying into other high growth advanced markets.

The following table summarizes the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition:


Inventory	$	5,198
Property and equipment		299
Other assets		191
Intangible assets		38,850
Goodwill		42,587
Warranty liability		(175	)

Total purchase price	$	86,950


Customer relationships	$	21,250	7 years
Trademark and trade names		1,900	12 years
Developed technology		15,700	9-12 years

	$	38,850

This transaction resulted in an amount of purchase price that exceeded the estimated fair value of tangible and intangible assets, which was allocated to goodwill. The Company believes that the amount of goodwill relative to identifiable intangible assets relates to several factors including: (1) potential buyer-specific synergies related to market opportunities for a combined product offering; (2) potential to leverage the Company’s sales force and intellectual property to attract new customers and revenue and (3) potential to strengthen the Company’s position in the vacuum gauge market.

The results of this acquisition were included in the Company’s consolidated operations beginning on May 30, 2014. The pro forma consolidated statements reflecting the operating results of GP, had it been acquired as of January 1, 2013, would not differ materially from the operating results of the Company as reported for the year ended December 31, 2014. GP is included in the Company’s Instruments, Control and Vacuum Products group and the Advanced Manufacturing Capital Equipment reportable segment.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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+ Details

Goodwill and Intangible Assets

6 Months Ended

Jun. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

8)	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, 2015 and year ended December 31, 2014 were as follows:


	Six Months Ended June 30,									Twelve Months Ended December 31,
	2015									2014
	Gross Carrying Amount			Accumulated Impairment (Loss)			Net			Gross Carrying Amount			Accumulated Impairment (Loss)			Net
Beginning balance at January 1	$	331,795		$	(139,414	)	$	192,381		$	290,323		$	(139,414	)	$	150,909
Acquired goodwill⁽¹⁾		8,017			—			8,017			41,993			—			41,993
Foreign currency translation		(186	)		—			(186	)		(521	)		—			(521	)

Ending balance at June 30, 2015 and December 31, 2014	$	339,626		$	(139,414	)	$	200,212		$	331,795		$	(139,414	)	$	192,381

(1)

During 2015, the Company recorded $7,042 of goodwill related to the March 17, 2015 acquisition of Precisive. During the second quarter of 2015, the Company recorded a purchase accounting adjustment of $975 primarily related to an inventory valuation adjustment related to the May 30, 2014 acquisition of GP. During the second quarter of 2014, the Company recorded $41,612 of goodwill related to the acquisition of GP. During the first quarter of 2014, the Company recorded a purchase accounting adjustment of $381 related to the March 12, 2013 purchase of Alter S.r.l.

Intangible Assets

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


As of June 30, 2015:	Gross		Accumulated Amortization			Foreign Currency Translation			Net
Completed technology⁽¹⁾	$	101,200	$	(81,101	)	$	(63	)	$	20,036
Customer relationships⁽¹⁾		37,251		(14,527	)		171			22,895
Patents, trademarks, trade names and other⁽¹⁾		30,396		(25,551	)		46			4,891

	$	168,847	$	(121,179	)	$	154		$	47,822

(1)	During the three months ended March 31, 2015, the Company recorded $5,110 of separately identified intangible assets related to the Precisive acquisition, of which $820 was completed technology, $1,430 was customer relationships and $2,860 was patents, trademarks, trade names and other.


As of December 31, 2014:	Gross		Accumulated Amortization			Foreign Currency Translation		Net
Completed technology⁽¹⁾	$	100,380	$	(79,875	)	$	135	$	20,640
Customer relationships⁽¹⁾		35,821		(12,634	)		280		23,467
Patents, trademarks, trade names and other⁽¹⁾		27,536		(25,290	)		36		2,282

	$	163,737	$	(117,799	)	$	451	$	46,389

(1)	During 2014, the Company recorded $38,850 of separately identified intangible assets related to the May 30, 2014 acquisition of GP, of which $15,700 was completed technology, $21,250 was customer relationships and $1,900 was patents, trademarks, trade names and other.

Aggregate amortization expense related to acquired intangibles for the three and six months ended June 30, 2015 was $1,709 and $3,380, respectively. Aggregate amortization expense related to acquired intangibles for the three and six months ended June 30, 2014 was $1,044 and $1,454, respectively. Estimated amortization expense for each of the remaining fiscal years is as follows:


Year	Amount
2015 (remaining)	$	3,399
2016		6,696
2017		6,624
2018		6,608
2019		6,595
2020		6,510
Thereafter		11,390

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Other Assets

6 Months Ended

Jun. 30, 2015

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Other Assets

9)	Other Assets


	June 30, 2015		December 31, 2014
Other Current Assets:
Prepaid income tax	$	6,482	$	4,698
Income tax receivable		6,081		10,322
Other		15,640		12,492

Total other current assets	$	28,203	$	27,512

Other Assets:
Deferred tax assets, net	$	7,583	$	7,202
Long-term income tax receivable		8,258		8,092
Other		2,037		1,912

Total other assets	$	17,878	$	17,206

Other Liabilities

6 Months Ended

Jun. 30, 2015

Other Liabilities Disclosure [Abstract]

Other Liabilities

10)	Other Liabilities


	June 30, 2015		December 31, 2014
Other Current Liabilities:
Customer prepayments	$	8,060	$	2,746
Product warranties		5,876		6,266
Deferred revenue		6,194		8,283
Other		25,538		18,494

Total other current liabilities	$	45,668	$	35,789

Other Liabilities:
Long-term income tax payable	$	20,482	$	20,203
Accrued compensation		12,628		12,068
Other		5,809		6,324

Total other liabilities	$	38,919	$	38,595

Debt

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Debt

11)

Debt

The Company’s Japanese subsidiary 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, 2015 of up to an equivalent of $18,768 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. There were no borrowings outstanding under these arrangements at June 30, 2015 and December 31, 2014.

Product Warranties

6 Months Ended

Jun. 30, 2015

Guarantees [Abstract]

Product Warranties

12)	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. The product warranty liability is included in other current liabilities in the consolidated balance sheets.

Product warranty activities were as follows:


	Six Months Ended June 30,
	2015			2014
Beginning of period	$	6,266		$	6,956
Provision for product warranties		2,095			1,589
Direct charges to warranty liability		(2,434	)		(1,476	)
Foreign currency translation		(51	)		48

End of period	$	5,876		$	7,117

Income Taxes

6 Months Ended

Jun. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes

13)	Income Taxes

The Company’s effective tax rate for the three and six months ended June 30, 2015 was 29.1% and 29.0%, respectively. The effective tax rate for the three and six months ended June 30, 2015 was lower than the U.S. statutory tax rate primarily due to the geographic mix of income and profits earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory tax rate and the deduction for domestic production activities. The Company’s effective tax rate for the three and six months ended June 30, 2014 was 31.3% and 23.9%, respectively. The effective tax rate for the three months ended June 30, 2014 was lower than the U.S. statutory tax rate due to the impact of lower tax rates on foreign income and the deduction for domestic production activities. The effective tax rate for the six months ended June 30, 2014 was lower than the U.S. statutory tax rate primarily due to the discrete release of income tax reserves related to the effective settlement of a foreign tax examination in the quarter ended March 31, 2014.

At June 30, 2015, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $19,508. At December 31, 2014, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $19,610. The net decrease from December 31, 2014 was attributable to a release of reserves for uncertain tax positions due to the expiration of the statute of limitations related to a previously open tax year. As of June 30, 2015, if these benefits were recognized in a future period, the timing of which is not estimable, the net unrecognized tax benefit of $11,524, 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. At June 30, 2015 and December 31, 2014, the Company had accrued interest on unrecognized tax benefits of approximately $701 and $578, respectively.

Over the next 12 months it is reasonably possible that the Company may recognize approximately $950 of previously net unrecognized tax benefits 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 federal, state and foreign tax authorities. The Internal Revenue Service commenced an examination of the Company’s U.S. federal tax filings for tax years 2011 through 2013 during the quarter ended March 31, 2015. As a result, the U.S. statute of limitations remains open between tax years 2011 through present. However, carryforward amounts from prior years may still be adjusted upon examination by tax authorities if they are used in a future period. The statute of limitations for the Company’s tax filings in other jurisdictions varies between fiscal years 2008 through the present.

Net Income Per Share

6 Months Ended

Jun. 30, 2015

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,
	2015		2014		2015		2014
Numerator:
Net income	$	33,220	$	21,224	$	67,006	$	52,469

Denominator:
Shares used in net income per common share – basic		53,384,000		53,361,000		53,299,000		53,386,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan		205,000		176,000		260,000		271,000

Shares used in net income per common share – diluted		53,589,000		53,537,000		53,559,000		53,657,000

Net income per common share:
Basic	$	0.62	$	0.40	$	1.26	$	0.98
Diluted	$	0.62	$	0.40	$	1.25	$	0.98

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 (stock options and restricted stock units) had been converted to such common shares, and if such assumed conversion is dilutive.

As of June 30, 2015, stock options and restricted stock units related to an aggregate of approximately 772,000 shares were outstanding. For the three and six months ended June 30, 2015, there were no weighted-average shares of restricted stock units and stock options that were excluded from the computation of diluted weighted-average shares outstanding that would have an anti-dilutive effect on EPS.

As of June 30, 2014, stock options and restricted stock units relating to an aggregate of approximately 830,000 shares were outstanding. For the three and six months ended June 30, 2014, the potential dilutive effect of approximately 90 and 800 weighted-average shares, respectively, of restricted stock units and stock options were excluded from the computation of diluted weighted-average shares outstanding as the shares would have an anti-dilutive effect on EPS.

Stockholder's Equity

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Stockholder's Equity

15)	Stockholder’s Equity

Stock 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 depends 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.

During the six months ended June 30, 2015, the Company repurchased approximately 116,000 shares of its common stock for $4,341, or an average price of $37.55 per share. During the six months ended June 30, 2014, the Company repurchased approximately 728,000 shares of its common stock for $20,809, or an average price of $28.59 per share.

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. During the six months ended June 30, 2015, the Company’s Board of Directors declared a cash dividend of $0.165 per share in the first quarter of 2015 and a cash dividend of $0.17 per share in the second quarter of 2015, which totaled $17,868. During the six months ended June 30, 2014, the Company’s Board of Directors declared a cash dividend of $0.16 per share in the first quarter of 2014 and a cash dividend of $0.165 per share in the second quarter of 2014, which totaled $17,326.

On July 27, 2015, our Board of Directors declared a quarterly cash dividend of $0.17 per share to be paid on September 11, 2015 to shareholders of record as of August 31, 2015. 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.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

+ Details

Business Segment, Geographic Area, Product and Significant Customer Information

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Business Segment, Geographic Area, Product and Significant Customer Information

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

The Company develops, manufactures, sells and services products that measure, control, power and monitor critical parameters of advanced manufacturing processes. The Company’s Chief Operating Decision Maker (“CODM”) utilizes consolidated financial information to make decisions about allocating resources and assessing performance for the entire Company. In addition, certain disaggregated financial information is also provided to the CODM, 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 four reportable segments.

Effective January 1, 2015, the Company changed the structure of its reportable segments based upon a change in the information that is provided to the Company’s CODM. The Company’s four reportable segments prior to the change in structure were: Advanced Manufacturing Capital Equipment, Analytical Solutions Group, Europe Region Sales & Service and Asia Region Sales & Service. The Company’s new structure still reflects four reportable segments; however, the composition of the segments has changed.

The Company’s new reportable segments are Advanced Manufacturing Capital Equipment, Global Service, Asia Region Sales and Other. The primary change to the segment structure was to separate worldwide service from product sales and create a separate reportable segment known as Global Service. Product sales in the Advanced Manufacturing Capital Equipment segment remained with this segment. Asia product sales became a separate reportable segment. The product sales from the operating segments that made up the Analytical Solutions Group and Europe Region sales were combined into the Other segment and are not reported separately as they are individually immaterial and collectively below the separate segment reporting guidelines. The Company has reported corporate expenses and certain intercompany pricing transactions in a Corporate and Eliminations reconciling column. Due to these changes, the results presented under segment reporting for the three and six months ended June 30, 2014 and as of December 31, 2014 reflect the new segments to conform to the current period segment reporting presentation with no impact to the consolidated results of operations.

The Advanced Manufacturing Capital Equipment segment includes the development, manufacturing and sales of instruments and control products, power and reactive gas products, materials delivery products and vacuum products, all of which are utilized in semiconductor processing and other similar advanced manufacturing processes. Sales in this segment include both external sales and intercompany product sales, which are recorded at transfer prices in accordance with applicable tax requirements.

The Global Service segment includes the worldwide servicing of instruments and control products, power and reactive gas products, materials delivery products and vacuum products, all of which are utilized in semiconductor processing and other similar advanced manufacturing processes. It also includes sales of custom fabrication services.

The Asia Region Sales segment mainly resells products from the Advanced Manufacturing Capital Equipment and Other segments into Asia regions.

The Other segment includes operating segments that are not required to be reported separately as a reportable segment and includes sales for products that are re-sold from the Advanced Manufacturing Capital Equipment into Europe regions as well as sales from other operating segments.

MKS derives the segment results directly from the manner in which results are reported in its management reporting system. The accounting policies MKS uses to derive reportable segment results are substantially the same as those used for external reporting purposes except that a substantial portion of the sales of the Advanced Manufacturing Capital Equipment and Other segments are intercompany sales to the regions at tax-based transfer prices and certain significant costs, including stock-based compensation and management incentive compensation, are not allocated to the segments and are included in Corporate and Eliminations. The CODM reviews several metrics of each operating segment, including net revenues and gross profit (loss).

The Company does not maintain balance sheets for the majority of its operating segments and, as such, amounts have not been allocated to the reportable segments. 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 is net revenues by reportable segment:


	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Advanced Manufacturing Capital Equipment	$	178,966		$	146,479		$	358,199		$	311,977
Global Service		29,685			27,231			57,428			52,398
Asia Region Sales⁽¹⁾		56,777			40,790			112,154			92,889
Other		18,796			19,183			40,012			40,076
Corporate and Eliminations		(66,258	)		(48,986	)		(135,988	)		(106,290	)

	$	217,966		$	184,697		$	431,805		$	391,050

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


	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Gross profit by reportable segment:
Advanced Manufacturing Capital Equipment	$	82,552		$	59,918		$	161,240		$	127,025
Global Service		10,366			9,683			19,968			18,080
Asia Region Sales⁽¹⁾		7,815			6,319			14,736			15,396
Other		5,697			6,678			12,539			13,425
Corporate and Eliminations		(7,632	)		(2,963	)		(12,639	)		(4,919	)

Total gross profit by reportable segment		98,798			79,635			195,844			169,007
Operating expenses:
Research and development		17,567			15,421			34,247			31,039
Selling, general and administrative		33,269			32,239			64,136			66,830
Acquisition costs		—			271			30			499
Restructuring		219			—			1,007			747
Amortization of intangible assets		1,709			1,044			3,380			1,454

Income from operations		46,034			30,660			93,044			68,438
Net interest income		790			231			1,294			466

Income before income taxes		46,824			30,891			94,338			68,904
Provision for income taxes		13,604			9,667			27,332			16,435

Net income	$	33,220		$	21,224		$	67,006		$	52,469

(1)

The Asia Region Sales segment does not represent total geographical Asia financial information. This sales operation only represents the sales from the resale of Advanced Manufacturing Capital Equipment and Other segment products in their respective regions. The Advanced Manufacturing Capital Equipment and Other segments both have sales in this region. Accordingly, total geographical sales include sales from multiple reportable segments.

The following is capital expenditures by reportable segment for the three and six months ended June 30, 2015 and 2014:


	Advanced Manufacturing Capital Equipment		Global Service		Asia Region Sales		Other		Corporate and Eliminations		Total
Three Months Ended June 30, 2015:
Capital expenditures	$	1,622	$	163	$	51	$	162	$	832	$	2,830

Six Months Ended June 30, 2015:
Capital expenditures	$	3,144	$	285	$	93	$	236	$	1,576	$	5,334


	Advanced Manufacturing Capital Equipment		Global Service		Asia Region Sales		Other		Corporate and Eliminations		Total
Three Months Ended June 30, 2014:
Capital expenditures	$	1,131	$	419	$	151	$	1,462	$	994	$	4,157

Six Months Ended June 30, 2014:
Capital expenditures	$	3,705	$	589	$	192	$	1,537	$	1,232	$	7,255

The following is depreciation and amortization by reportable segment for the three and six months ended June 30, 2015 and 2014:


	Advanced Manufacturing Capital Equipment		Global Service		Asia Region Sales		Other		Corporate and Eliminations		Total
Three Months Ended June 30, 2015:
Depreciation and amortization	$	4,305	$	254	$	88	$	268	$	635	$	5,550

Six Months Ended June 30, 2015:
Depreciation and amortization	$	8,552	$	510	$	173	$	578	$	1,269	$	11,082


	Advanced Manufacturing Capital Equipment		Global Service		Asia Region Sales		Other		Corporate and Eliminations		Total
Three Months Ended June 30, 2014:
Depreciation and amortization	$	3,528	$	267	$	101	$	251	$	668	$	4,815

Six Months Ended June 30, 2014:
Depreciation and amortization	$	6,454	$	539	$	200	$	459	$	1,313	$	8,965

In connection with the new segment structure, goodwill was allocated to each reportable segment on a relative fair value basis. The Company performed an interim quantitative impairment test as of January 1, 2015 and concluded that the fair values of each reporting unit exceeded their respective carrying values.

Goodwill associated with each of our reportable segments is as follows:


	June 30, 2015			December 31, 2014
Reportable segment:
Advanced Manufacturing Capital Equipment	$	174,344		$	166,946
Global Service		19,826			19,728
Asia Region Sales		—			—
Other		6,228			6,228
Foreign currency translation		(186	)		(521	)

Total goodwill	$	200,212		$	192,381

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 three groups of similar products based upon the similarity of product function. Worldwide net revenue for each group of products is as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Instruments, Control and Vacuum Products	$	110,441	$	90,250	$	220,877	$	191,907
Power and Reactive Gas Products		92,977		79,360		181,476		169,962
Analytical Solutions Products		14,548		15,087		29,452		29,181

	$	217,966	$	184,697	$	431,805	$	391,050

Sales of Instruments, Control and Vacuum Products and Power and Reactive Gas Products are included in the Company’s Advanced Manufacturing Capital Equipment, Asia Region Sales, Global Service and Other segments because the products are sold through these segments. Sales of the Analytical Solutions Products are included in the Asia Region Sales, Global Service and Other segments because the products are sold through these segments.

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 negotiated transfer prices and have been eliminated from consolidated net revenues.


	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Net revenues:
United States	$	123,413	$	107,931	$	243,594	$	225,309
Korea		27,349		19,536		59,421		50,266
Japan		17,046		14,416		34,302		31,343
Asia (excluding Korea and Japan)		30,743		24,002		54,426		45,765
Europe		19,415		18,812		40,062		38,367

	$	217,966	$	184,697	$	431,805	$	391,050


	June 30, 2015		December 31, 2014
Long-lived assets:⁽¹⁾
United States	$	56,699	$	57,701
Europe		5,717		6,099
Asia		9,520		10,887

	$	71,936	$	74,687

(1)	Long-lived assets include property, plant and equipment, net and certain other long-term assets, excluding long-term income tax receivable.

Major Customers

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


	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Customer A		18.1	%		18.9	%		17.8	%		19.6	%
Customer B		13.2	%		13.8	%		12.7	%		13.4	%

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 40
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 42
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 10
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 29
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599

+ Details

Restructuring

6 Months Ended

Jun. 30, 2015

Restructuring and Related Activities [Abstract]

Restructuring

17)	Restructuring

The Company recorded restructuring charges of $219 and $1,007 during the three and six months ended June 30, 2015, respectively. The Company recorded restructuring charges of $747 during the six months ended June 30, 2014. The restructuring charges for the three and six months ended June 30, 2015 were primarily for severance associated with a reduction in workforce of approximately 123 people, primarily at one of the Company’s foreign manufacturing sites arising from the outsourcing of a non-core manufacturing process. Restructuring charges for the six months ended June 30, 2014 primarily related to severance costs associated with a reduction in workforce of approximately 75 people throughout the Company.

The activity related to the Company’s restructuring accrual is shown below:


	Six Months Ended June 30, 2015
Balance at December 31	$	92
Charged to expense		1,007
Payments		(924	)

Balance at June 30	$	175

Commitments and Contingencies

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

18)	Commitments and Contingencies

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 (Policies)	6 Months Ended
Basis of Presentation (Policies)	Jun. 30, 2015
Accounting Changes and Error Corrections [Abstract]
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to be consistent with current year classifications.
Recently Issued Accounting Pronouncements	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which supersedes all existing revenue recognition requirements, including most industry-specific guidance. The new standard requires a company to recognize revenue when it transfers goods and services to customers in an amount that reflects the consideration that the company expects to be entitled to in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and assets recognized from costs incurred to obtain or fulfill a contract. This pronouncement is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. However, in March 2015, the FASB proposed a one-year deferral and in July 2015, the FASB agreed to defer by one year the mandatory effective date of its revenue recognition standard, but will also provide entities the option to adopt it as of the original effective date. 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 has not yet selected a transition method. The Company is currently evaluating the requirements of ASU No. 2014-09 and has not yet determined its impact on the Company’s consolidated financial statements. In August 2014, the FASB issued ASU No. 2014-15, “Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern.” Under this ASU, management will be required to assess an entity’s ability to continue as a going concern, and to provide related footnote disclosures in certain circumstances. The provisions of this ASU are effective for annual periods beginning after December 15, 2016, and for annual and interim periods thereafter. This ASU is not expected to have an impact on the Company’s financial statements or disclosures.

Investments (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Fair Value of Short-Term and Long-Term Available-for-Sale Investments

The fair value of short-term investments with maturities or estimated lives of less than one year consists of the following:


	June 30, 2015		December 31, 2014
Available-for-sale investments:
Time deposits and certificates of deposit	$	23,630	$	20,900
Asset-backed securities		155		—
Bankers’ acceptance drafts		222		82
Commercial paper		3,450		—
Corporate obligations		59,719		24,020
Municipal bonds		7,057		2,099
U.S. agency obligations		83,200		82,493

	$	177,433	$	129,594

The fair value of long-term investments with maturities of more than one year consists of the following:


	June 30, 2015		December 31, 2014
Available-for-sale investments:
Time deposits and certificates of deposit	$	—	$	48
Asset-backed securities		140,677		75,674
Corporate obligations		103,570		64,669
Municipal bonds		605		1,254
U.S. agency obligations		12,003		15,556

	$	256,855	$	157,201

Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term and Long-Term Securities

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


As of June 30, 2015:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits and certificates of deposit	$	23,630	$	—	$	—		$	23,630
Asset-backed securities		256		—		(101	)		155
Bankers’ acceptance drafts		222		—		—			222
Commercial paper		3,449		1		—			3,450
Corporate obligations		59,735		7		(23	)		59,719
Municipal bonds		7,055		6		(4	)		7,057
U.S. agency obligations		83,176		25		(1	)		83,200

	$	177,523	$	39	$	(129	)	$	177,433

Long-term investments:
Asset-backed securities	$	140,695	$	50	$	(68	)	$	140,677
Corporate obligations		103,709		17		(156	)		103,570
Municipal bonds		615		—		(10	)		605
U.S. agency obligations		11,998		6		(1	)		12,003

	$	257,017	$	73	$	(235	)	$	256,855


As of December 31, 2014:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
Short-term investments:
Time deposits and certificates of deposit	$	20,901	$	—	$	(1	)	$	20,900
Bankers’ acceptance drafts		82		—		—			82
Corporate obligations		24,029		2		(11	)		24,020
Municipal bonds		2,100		—		(1	)		2,099
U.S. agency obligations		82,488		14		(9	)		82,493

	$	129,600	$	16	$	(22	)	$	129,594

Long-term investments:
Time deposits and certificates of deposit	$	48	$	—	$	—		$	48
Asset-backed securities		75,778		5		(109	)		75,674
Corporate obligations		64,842		1		(174	)		64,669
Municipal bonds		1,258		—		(4	)		1,254
U.S. agency obligations		15,563		2		(9	)		15,556

	$	157,489	$	8	$	(296	)	$	157,201

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

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, 2015 and are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	June 30, 2015		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	95,975	$	95,975	$	—	$	—
Bankers’ acceptance drafts		48		—		48		—
Available-for-sale investments:
Bankers’ acceptance drafts		222		—		222		—
Time deposits and certificates of deposit		23,630		—		23,630		—
Commercial paper		3,450		—		3,450		—
Asset-backed securities		140,832		—		140,832		—
Corporate obligations		163,289		—		163,289		—
Municipal bonds		7,662		—		7,662		—
U.S. agency obligations		95,203		—		95,203		—
Derivatives – currency forward contracts		801		—		801		—

Total assets	$	531,112	$	95,975	$	435,137	$	—

Liabilities:
Derivatives – currency forward contracts	$	535	$	—	$	535	$	—

Reported as follows:
Assets:
Cash and cash equivalents⁽¹⁾	$	96,023	$	95,975	$	48	$	—
Short-term investments		177,433		—		177,433		—
Other current assets		801		—		801		—

Total current assets	$	274,257	$	95,975	$	178,282	$	—

Long-term investments	$	256,855	$	—	$	256,855	$	—

Liabilities:
Other current liabilities	$	535	$	—	$	535	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $66,273 and non-negotiable time deposits of $16,023 as of June 30, 2015.

Assets and liabilities of the Company measured at fair value on a recurring basis as of December 31, 2014, are summarized as follows:


			Fair Value Measurements at Reporting Date Using
Description	December 31, 2014		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	129,092	$	129,092	$	—	$	—
Bankers acceptance drafts		131		—		131		—
Corporate obligations		700		—		700		—
Available-for-sale investments:
Time deposits and certificates of deposit		20,948		—		20,948		—
Asset-backed securities		75,674		—		75,674		—
Bankers acceptance drafts		82		—		82		—
Corporate obligations		88,689		—		88,689		—
Municipal bonds		3,353		—		3,353		—
U.S. agency obligations		98,049		—		98,049		—
Derivatives – currency forward contracts		2,110		—		2,110		—

Total assets	$	418,828	$	129,092	$	289,736	$	—

Reported as follows:
Assets:
Cash and cash equivalents⁽¹⁾	$	129,923	$	129,092	$	831	$	—
Short-term investments		129,594		—		129,594		—
Other current assets		2,110		—		2,110		—

Total current assets	$	261,627	$	129,092	$	132,535	$	—

Long-term investments	$	157,201	$	—	$	157,201	$	—

(1)	The cash and cash equivalent amounts presented in the table above do not include cash of $167,517 and non-negotiable time deposits of $7,997 as of December 31, 2014.

Derivatives (Tables)

6 Months Ended

Jun. 30, 2015

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, 2015 and December 31, 2014:


	June 30, 2015
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value⁽¹⁾ Asset/(Liability)
U.S. Dollar/Japanese Yen	$	25,695	$	392
U.S. Dollar/South Korean Won		43,030		172
U.S. Dollar/Euro		5,675		1
U.S. Dollar/U.K. Pound Sterling		4,115		(124	)
U.S. Dollar/Taiwan Dollar		12,765		(175	)

Total	$	91,280	$	266

(1)	Represents the fair value of the net asset / (liability) amount included in the consolidated balance sheet.


	December 31, 2014
Currency Hedged (Buy/Sell)	Gross Notional Value		Fair Value ⁽¹⁾ Asset/(Liability)
U.S. Dollar/Japanese Yen	$	8,035	$	1,107
U.S. Dollar/South Korean Won		12,512		372
U.S. Dollar/Euro		2,060		185
U.S. Dollar/U.K. Pound Sterling		1,308		70
U.S. Dollar/Taiwan Dollar		4,735		232

Total	$	28,650	$	1,966

(1)	Represents the fair value of the net asset / (liability) 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:


	June 30, 2015			December 31, 2014
Derivative assets:
Forward exchange contracts	$	801		$	1,966
Derivative liabilities:
Forward exchange contracts		(535	)		—

Total net derivative asset designated as hedging instruments⁽¹⁾	$	266		$	1,966

(1)

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

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


	Three Months Ended June 30,						Six Months Ended June 30,
Derivatives Designated as Cash Flow Hedging Relationships	2015			2014			2015			2014
Forward exchange contracts:
Net (loss) recognized in OCI⁽¹⁾	$	(1,430	)	$	(1,230	)	$	(3,520	)	$	(1,564	)
Net gain (loss) reclassified from accumulated OCI into income⁽²⁾	$	716		$	(76	)	$	1,909		$	(151	)

(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, 2015 and 2014. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial.

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

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


	Three Months Ended June 30,						Six Months Ended June 30,
Derivatives Not Designated as Hedging Instruments	2015			2014			2015			2014
Forward exchange contracts:
Net (loss) recognized in income⁽¹⁾	$	(108	)	$	(204	)	$	(10	)	$	(98	)

(1)	The Company enters into foreign exchange contracts to hedge against changes in the balance sheet for certain subsidiaries. These derivatives are not designated as hedging instruments and are recorded immediately in selling, general and administrative expenses.

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41641-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=56946850&loc=d3e41620-113959

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Inventories (Tables)

6 Months Ended

Jun. 30, 2015

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consist of the following:


	June 30, 2015		December 31, 2014
Raw materials	$	85,067	$	81,121
Work-in-process		27,765		26,604
Finished goods		52,758		47,444

	$	165,590	$	155,169

Acquisitions (Tables)

6 Months Ended

Jun. 30, 2015

Precisive, LLC [Member]

Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed

The following table summarizes the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition:


Current assets	$	693
Non-current assets		18
Intangible assets		5,110
Goodwill		7,042

Total assets acquired		12,863

Total current liabilities assumed		(343	)

Fair value of assets acquired and liabilities assumed		12,520

Less cash acquired		(435	)

Total purchase price, net of cash acquired	$	12,085

Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives


Order backlog	$	50	18 months
Customer relationships		1,430	8 years
Exclusive patent license		2,600	10 years
Trade names		210	10 years
Current developed technology		820	10 years

	$	5,110

Granville-Phillips [Member]

Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed

The following table summarizes the estimated fair value of the assets acquired and liabilities assumed at the date of acquisition:


Inventory	$	5,198
Property and equipment		299
Other assets		191
Intangible assets		38,850
Goodwill		42,587
Warranty liability		(175	)

Total purchase price	$	86,950

Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives

The following table reflects the allocation of the acquired intangible assets and related estimates of useful lives. These acquired intangibles will be amortized on a straight-line basis.


Customer relationships	$	21,250	7 years
Trademark and trade names		1,900	12 years
Developed technology		15,700	9-12 years

	$	38,850

Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2015

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, 2015 and year ended December 31, 2014 were as follows:


	Six Months Ended June 30,									Twelve Months Ended December 31,
	2015									2014
	Gross Carrying Amount			Accumulated Impairment (Loss)			Net			Gross Carrying Amount			Accumulated Impairment (Loss)			Net
Beginning balance at January 1	$	331,795		$	(139,414	)	$	192,381		$	290,323		$	(139,414	)	$	150,909
Acquired goodwill⁽¹⁾		8,017			—			8,017			41,993			—			41,993
Foreign currency translation		(186	)		—			(186	)		(521	)		—			(521	)

Ending balance at June 30, 2015 and December 31, 2014	$	339,626		$	(139,414	)	$	200,212		$	331,795		$	(139,414	)	$	192,381

(1)

Intangible Assets

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


As of June 30, 2015:	Gross		Accumulated Amortization			Foreign Currency Translation			Net
Completed technology⁽¹⁾	$	101,200	$	(81,101	)	$	(63	)	$	20,036
Customer relationships⁽¹⁾		37,251		(14,527	)		171			22,895
Patents, trademarks, trade names and other⁽¹⁾		30,396		(25,551	)		46			4,891

	$	168,847	$	(121,179	)	$	154		$	47,822

(1)	During the three months ended March 31, 2015, the Company recorded $5,110 of separately identified intangible assets related to the Precisive acquisition, of which $820 was completed technology, $1,430 was customer relationships and $2,860 was patents, trademarks, trade names and other.


As of December 31, 2014:	Gross		Accumulated Amortization			Foreign Currency Translation		Net
Completed technology⁽¹⁾	$	100,380	$	(79,875	)	$	135	$	20,640
Customer relationships⁽¹⁾		35,821		(12,634	)		280		23,467
Patents, trademarks, trade names and other⁽¹⁾		27,536		(25,290	)		36		2,282

	$	163,737	$	(117,799	)	$	451	$	46,389

(1)	During 2014, the Company recorded $38,850 of separately identified intangible assets related to the May 30, 2014 acquisition of GP, of which $15,700 was completed technology, $21,250 was customer relationships and $1,900 was patents, trademarks, trade names and other.

Estimated Amortization Expense

Estimated amortization expense for each of the remaining fiscal years is as follows:


Year	Amount
2015 (remaining)	$	3,399
2016		6,696
2017		6,624
2018		6,608
2019		6,595
2020		6,510
Thereafter		11,390

Other Assets (Tables)

6 Months Ended

Jun. 30, 2015

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Other Assets


	June 30, 2015		December 31, 2014
Other Current Assets:
Prepaid income tax	$	6,482	$	4,698
Income tax receivable		6,081		10,322
Other		15,640		12,492

Total other current assets	$	28,203	$	27,512

Other Assets:
Deferred tax assets, net	$	7,583	$	7,202
Long-term income tax receivable		8,258		8,092
Other		2,037		1,912

Total other assets	$	17,878	$	17,206

Other Liabilities (Tables)

6 Months Ended

Jun. 30, 2015

Other Liabilities Disclosure [Abstract]

Schedule of Other Liabilities


	June 30, 2015		December 31, 2014
Other Current Liabilities:
Customer prepayments	$	8,060	$	2,746
Product warranties		5,876		6,266
Deferred revenue		6,194		8,283
Other		25,538		18,494

Total other current liabilities	$	45,668	$	35,789

Other Liabilities:
Long-term income tax payable	$	20,482	$	20,203
Accrued compensation		12,628		12,068
Other		5,809		6,324

Total other liabilities	$	38,919	$	38,595

Product Warranties (Tables)

6 Months Ended

Jun. 30, 2015

Guarantees [Abstract]

Product Warranty Activities

Product warranty activities were as follows:


	Six Months Ended June 30,
	2015			2014
Beginning of period	$	6,266		$	6,956
Provision for product warranties		2,095			1,589
Direct charges to warranty liability		(2,434	)		(1,476	)
Foreign currency translation		(51	)		48

End of period	$	5,876		$	7,117

Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2015

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,
	2015		2014		2015		2014
Numerator:
Net income	$	33,220	$	21,224	$	67,006	$	52,469

Denominator:
Shares used in net income per common share – basic		53,384,000		53,361,000		53,299,000		53,386,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan		205,000		176,000		260,000		271,000

Shares used in net income per common share – diluted		53,589,000		53,537,000		53,559,000		53,657,000

Net income per common share:
Basic	$	0.62	$	0.40	$	1.26	$	0.98
Diluted	$	0.62	$	0.40	$	1.25	$	0.98

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

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Net Revenues by Reportable Segment

The following is net revenues by reportable segment:


	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Advanced Manufacturing Capital Equipment	$	178,966		$	146,479		$	358,199		$	311,977
Global Service		29,685			27,231			57,428			52,398
Asia Region Sales⁽¹⁾		56,777			40,790			112,154			92,889
Other		18,796			19,183			40,012			40,076
Corporate and Eliminations		(66,258	)		(48,986	)		(135,988	)		(106,290	)

	$	217,966		$	184,697		$	431,805		$	391,050

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,
	2015			2014			2015			2014
Gross profit by reportable segment:
Advanced Manufacturing Capital Equipment	$	82,552		$	59,918		$	161,240		$	127,025
Global Service		10,366			9,683			19,968			18,080
Asia Region Sales⁽¹⁾		7,815			6,319			14,736			15,396
Other		5,697			6,678			12,539			13,425
Corporate and Eliminations		(7,632	)		(2,963	)		(12,639	)		(4,919	)

Total gross profit by reportable segment		98,798			79,635			195,844			169,007
Operating expenses:
Research and development		17,567			15,421			34,247			31,039
Selling, general and administrative		33,269			32,239			64,136			66,830
Acquisition costs		—			271			30			499
Restructuring		219			—			1,007			747
Amortization of intangible assets		1,709			1,044			3,380			1,454

Income from operations		46,034			30,660			93,044			68,438
Net interest income		790			231			1,294			466

Income before income taxes		46,824			30,891			94,338			68,904
Provision for income taxes		13,604			9,667			27,332			16,435

Net income	$	33,220		$	21,224		$	67,006		$	52,469

(1)

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, 2015 and 2014:


	Advanced Manufacturing Capital Equipment		Global Service		Asia Region Sales		Other		Corporate and Eliminations		Total
Three Months Ended June 30, 2015:
Capital expenditures	$	1,622	$	163	$	51	$	162	$	832	$	2,830

Six Months Ended June 30, 2015:
Capital expenditures	$	3,144	$	285	$	93	$	236	$	1,576	$	5,334


	Advanced Manufacturing Capital Equipment		Global Service		Asia Region Sales		Other		Corporate and Eliminations		Total
Three Months Ended June 30, 2014:
Capital expenditures	$	1,131	$	419	$	151	$	1,462	$	994	$	4,157

Six Months Ended June 30, 2014:
Capital expenditures	$	3,705	$	589	$	192	$	1,537	$	1,232	$	7,255

The following is depreciation and amortization by reportable segment for the three and six months ended June 30, 2015 and 2014:


	Advanced Manufacturing Capital Equipment		Global Service		Asia Region Sales		Other		Corporate and Eliminations		Total
Three Months Ended June 30, 2015:
Depreciation and amortization	$	4,305	$	254	$	88	$	268	$	635	$	5,550

Six Months Ended June 30, 2015:
Depreciation and amortization	$	8,552	$	510	$	173	$	578	$	1,269	$	11,082


	Advanced Manufacturing Capital Equipment		Global Service		Asia Region Sales		Other		Corporate and Eliminations		Total
Three Months Ended June 30, 2014:
Depreciation and amortization	$	3,528	$	267	$	101	$	251	$	668	$	4,815

Six Months Ended June 30, 2014:
Depreciation and amortization	$	6,454	$	539	$	200	$	459	$	1,313	$	8,965

Summary of Goodwill Associated with Reportable Segments

Goodwill associated with each of our reportable segments is as follows:


	June 30, 2015			December 31, 2014
Reportable segment:
Advanced Manufacturing Capital Equipment	$	174,344		$	166,946
Global Service		19,826			19,728
Asia Region Sales		—			—
Other		6,228			6,228
Foreign currency translation		(186	)		(521	)

Total goodwill	$	200,212		$	192,381

Worldwide Net Revenue for Each Group of Products

Worldwide net revenue for each group of products is as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Instruments, Control and Vacuum Products	$	110,441	$	90,250	$	220,877	$	191,907
Power and Reactive Gas Products		92,977		79,360		181,476		169,962
Analytical Solutions Products		14,548		15,087		29,452		29,181

	$	217,966	$	184,697	$	431,805	$	391,050

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

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


	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Net revenues:
United States	$	123,413	$	107,931	$	243,594	$	225,309
Korea		27,349		19,536		59,421		50,266
Japan		17,046		14,416		34,302		31,343
Asia (excluding Korea and Japan)		30,743		24,002		54,426		45,765
Europe		19,415		18,812		40,062		38,367

	$	217,966	$	184,697	$	431,805	$	391,050


	June 30, 2015		December 31, 2014
Long-lived assets:⁽¹⁾
United States	$	56,699	$	57,701
Europe		5,717		6,099
Asia		9,520		10,887

	$	71,936	$	74,687

(1)	Long-lived assets include property, plant and equipment, net and certain other long-term assets, excluding long-term income tax receivable.

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 as follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Customer A		18.1	%		18.9	%		17.8	%		19.6	%
Customer B		13.2	%		13.8	%		12.7	%		13.4	%

Restructuring (Tables)

6 Months Ended

Jun. 30, 2015

Restructuring and Related Activities [Abstract]

Schedule of Company's Restructuring Activity

The activity related to the Company’s restructuring accrual is shown below:


	Six Months Ended June 30, 2015
Balance at December 31	$	92
Charged to expense		1,007
Payments		(924	)

Balance at June 30	$	175

Investments - Fair Value of Short-Term Available-for-Sale Investments (Detail) - Short-Term Investments [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	$ 177,433	$ 129,594
Time Deposits and Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	23,630	20,900
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	155
Bankers' Acceptance Drafts [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	222	82
Commercial Paper [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	3,450
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	59,719	24,020
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	7,057	2,099
U.S. Agency Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	$ 83,200	$ 82,493

Investments - Fair Value of Long-Term Available-for-Sale Investments (Detail) - Long-Term Investments [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 256,855	$ 157,201
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments		48
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	140,677	75,674
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	103,570	64,669
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	605	1,254
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 12,003	$ 15,556

Investments - Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term and Long-Term Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	$ 177,523	$ 129,600
Investments, Gross Unrealized Gains	39	16
Investments, Gross Unrealized (Losses)	(129)	(22)
Investments, Estimated Fair Value	177,433	129,594
Short-Term Investments [Member] \| Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	23,630	20,901
Investments, Gross Unrealized (Losses)		(1)
Investments, Estimated Fair Value	23,630	20,900
Short-Term Investments [Member] \| Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	256
Investments, Gross Unrealized (Losses)	(101)
Investments, Estimated Fair Value	155
Short-Term Investments [Member] \| Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	222	82
Investments, Estimated Fair Value	222	82
Short-Term Investments [Member] \| Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	3,449
Investments, Gross Unrealized Gains	1
Investments, Estimated Fair Value	3,450
Short-Term Investments [Member] \| Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	59,735	24,029
Investments, Gross Unrealized Gains	7	2
Investments, Gross Unrealized (Losses)	(23)	(11)
Investments, Estimated Fair Value	59,719	24,020
Short-Term Investments [Member] \| Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	7,055	2,100
Investments, Gross Unrealized Gains	6
Investments, Gross Unrealized (Losses)	(4)	(1)
Investments, Estimated Fair Value	7,057	2,099
Short-Term Investments [Member] \| U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	83,176	82,488
Investments, Gross Unrealized Gains	25	14
Investments, Gross Unrealized (Losses)	(1)	(9)
Investments, Estimated Fair Value	83,200	82,493
Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	257,017	157,489
Investments, Gross Unrealized Gains	73	8
Investments, Gross Unrealized (Losses)	(235)	(296)
Investments, Estimated Fair Value	256,855	157,201
Long-Term Investments [Member] \| Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost		48
Investments, Estimated Fair Value		48
Long-Term Investments [Member] \| Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	140,695	75,778
Investments, Gross Unrealized Gains	50	5
Investments, Gross Unrealized (Losses)	(68)	(109)
Investments, Estimated Fair Value	140,677	75,674
Long-Term Investments [Member] \| Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	103,709	64,842
Investments, Gross Unrealized Gains	17	1
Investments, Gross Unrealized (Losses)	(156)	(174)
Investments, Estimated Fair Value	103,570	64,669
Long-Term Investments [Member] \| Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	615	1,258
Investments, Gross Unrealized (Losses)	(10)	(4)
Investments, Estimated Fair Value	605	1,254
Long-Term Investments [Member] \| U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	11,998	15,563
Investments, Gross Unrealized Gains	6	2
Investments, Gross Unrealized (Losses)	(1)	(9)
Investments, Estimated Fair Value	$ 12,003	$ 15,556

Investments - Additional Information (Detail) - Maximum [Member]	6 Months Ended
	Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Investment securities maturity period or average life	3 years
Average duration of portfolio	1 year

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts	$ 801	$ 1,966
Derivatives - currency forward contracts	535
Cash and cash equivalents	66,273	167,517
Short-term investments	177,433	129,594
Other current assets	801	1,966
Other current liabilities	535
Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts	801	2,110
Total assets	531,112	418,828
Derivatives - currency forward contracts	535
Cash and cash equivalents	96,023	129,923
Short-term investments	177,433	129,594
Other current assets	801	2,110
Total current assets	274,257	261,627
Available-for-sale investments	256,855	157,201
Other current liabilities	535
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	95,975	129,092
Cash and cash equivalents	95,975	129,092
Total current assets	95,975	129,092
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]
Derivatives - currency forward contracts	801	2,110
Total assets	435,137	289,736
Derivatives - currency forward contracts	535
Cash and cash equivalents	48	831
Short-term investments	177,433	129,594
Other current assets	801	2,110
Total current assets	178,282	132,535
Available-for-sale investments	256,855	157,201
Other current liabilities	535
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	95,975	129,092
Money Market Funds [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	95,975	129,092
Bankers' Acceptance Drafts [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	48	131
Available-for-sale investments	222	82
Bankers' Acceptance Drafts [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	48	131
Available-for-sale investments	222	82
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]
Available-for-sale investments	23,630	20,948
Time Deposits and Certificates of Deposit [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	23,630	20,948
Commercial Paper [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	3,450
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]
Available-for-sale investments	3,450
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	140,832	75,674
Asset-Backed Securities [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	140,832	75,674
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		700
Available-for-sale investments	163,289	88,689
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		700
Available-for-sale investments	163,289	88,689
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	7,662	3,353
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	7,662	3,353
U.S. Agency Obligations [Member] \| Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	95,203	98,049
U.S. Agency 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]
Available-for-sale investments	$ 95,203	$ 98,049

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Not included in cash and cash equivalent amount	$ 66,273	$ 167,517
Non-Negotiable Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Not included in cash and cash equivalent amount	$ 16,023	$ 7,997

Derivatives - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
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	$ 91,280	$ 28,650
Accumulated other comprehensive income realization period	12 months

Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 91,280	$ 28,650
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	266	1,966
Forward Exchange Contracts [Member] \| U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	25,695	8,035
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	392	1,107
Forward Exchange Contracts [Member] \| U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	43,030	12,512
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	172	372
Forward Exchange Contracts [Member] \| U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	5,675	2,060
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	1	185
Forward Exchange Contracts [Member] \| U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	4,115	1,308
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	(124)	70
Forward Exchange Contracts [Member] \| U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	12,765	4,735
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	$ (175)	$ 232

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Forward exchange contracts, assets	$ 801	$ 1,966
Forward exchange contracts, liabilities	(535)
Total net derivative asset designated as hedging instruments	266	1,966
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Forward exchange contracts, assets	801	1,966
Forward exchange contracts, liabilities	(535)
Total net derivative asset designated as hedging instruments	$ 266	$ 1,966

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative asset classified in other current assets	$ 801	$ 1,966
Derivative liability classified in other current liabilities	$ (535)

Derivatives - Summary of (Losses) Gains on Derivatives Designated as Hedging Instruments (Detail) - Forward Exchange Contracts [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net (loss) recognized in OCI	$ (1,430)	$ (1,230)	$ (3,520)	$ (1,564)
Net gain (loss) reclassified from accumulated OCI into income	$ 716	$ (76)	$ 1,909	$ (151)

Derivatives - Summary of (Losses) Gains on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net (loss) recognized in income	$ (108)	$ (204)	$ (10)	$ (98)

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 85,067	$ 81,121
Work-in-process	27,765	26,604
Finished goods	52,758	47,444
Inventories	$ 165,590	$ 155,169

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands		6 Months Ended
	Mar. 17, 2015	Jun. 30, 2015	Jun. 30, 2014	May 30, 2014
Business Acquisition [Line Items]
Payments to acquire business, net of cash acquired		$ 9,910	$ 86,950
Precisive, LLC [Member]
Business Acquisition [Line Items]
Payments to acquire business, net of cash acquired	$ 12,085
Business acquisition, ownership percentage	100.00%
Business acquisition, cash acquired	$ 435
Business acquisition, deferred consideration payment	$ 2,600
Business acquisition, deferred consideration payment period	15 months
Business combination consideration price	$ 12,520
Granville-Phillips [Member]
Business Acquisition [Line Items]
Business combination consideration price				$ 86,950

Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands		6 Months Ended
	Mar. 17, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	May 30, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill		$ 200,212		$ 192,381		$ 150,909
Total purchase price, net of cash acquired		9,910	$ 86,950
Precisive, LLC [Member]
Business Acquisition [Line Items]
Current assets	$ 693
Non-current assets	18
Intangible assets	5,110
Goodwill	7,042	$ 7,042
Total assets acquired	12,863
Total current liabilities assumed	(343)
Total purchase price	12,520
Less: cash acquired	(435)
Total purchase price, net of cash acquired	$ 12,085
Granville-Phillips [Member]
Business Acquisition [Line Items]
Inventory					$ 5,198
Property and equipment					299
Other assets					191
Intangible assets					38,850
Goodwill			$ 41,612		42,587
Warranty liability					(175)
Total purchase price					$ 86,950

Acquisitions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) - USD ($) $ in Thousands				3 Months Ended	12 Months Ended
	May 30, 2015	Mar. 17, 2015	May 30, 2014	Mar. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price				$ 5,110
Precisive, LLC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 5,110
Granville-Phillips [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price			$ 38,850		$ 38,850
Order Backlog [Member] \| Precisive, LLC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 50
Estimated useful life of finite-lived intangible assets		18 months
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price				$ 1,430
Customer Relationships [Member] \| Precisive, LLC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 1,430
Estimated useful life of finite-lived intangible assets		8 years
Customer Relationships [Member] \| Granville-Phillips [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price			21,250		$ 21,250
Estimated useful life of finite-lived intangible assets	7 years
Exclusive Patent License [Member] \| Precisive, LLC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 2,600
Estimated useful life of finite-lived intangible assets		10 years
Trade names [Member] \| Precisive, LLC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 210
Estimated useful life of finite-lived intangible assets		10 years
Current Developed Technology [Member] \| Precisive, LLC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 820
Estimated useful life of finite-lived intangible assets		10 years
Current Developed Technology [Member] \| Granville-Phillips [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price			15,700
Current Developed Technology [Member] \| Granville-Phillips [Member] \| Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life of finite-lived intangible assets	9 years
Current Developed Technology [Member] \| Granville-Phillips [Member] \| Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life of finite-lived intangible assets	12 years
Trademarks and Trade Names [Member] \| Granville-Phillips [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price			$ 1,900
Estimated useful life of finite-lived intangible assets	12 years

Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance, Goodwill Gross Carrying Amount	$ 331,795	$ 290,323
Acquired goodwill, Gross Carrying Amount	8,017	41,993
Foreign currency translation, Gross Carrying Amount	(186)	(521)
Ending balance, Goodwill Gross Carrying Amount	339,626	331,795
Beginning balance, Accumulated Impairment (Loss)	(139,414)	(139,414)
Acquired goodwill, Accumulated Impairment (Loss)	0	0
Foreign currency translation, Accumulated Impairment (Loss)	0	0
Ending balance, Accumulated Impairment (Loss)	(139,414)	(139,414)
Beginning balance, Goodwill Net	192,381	150,909
Acquired goodwill, Net	8,017	41,993
Foreign currency translation, Net	(186)	(521)
Ending balance, Goodwill Net	$ 200,212	$ 192,381

Goodwill and Intangible Assets - Goodwill (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2014	Jun. 30, 2015	Mar. 17, 2015	Dec. 31, 2014	Jun. 30, 2014	May 30, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill		$ 200,212		$ 192,381			$ 150,909
Precisive, LLC [Member]
Goodwill [Line Items]
Goodwill		7,042	$ 7,042
Granville-Phillips [Member]
Goodwill [Line Items]
Goodwill					$ 41,612	$ 42,587
Acquisition - Inventory adjustments		$ 975
Alter S.r.l [Member]
Goodwill [Line Items]
Acquisition purchase price	$ 381

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 168,847	$ 163,737
Accumulated Amortization	(121,179)	(117,799)
Foreign Currency Translation	154	451
Intangible assets, net	47,822	46,389
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	101,200	100,380
Accumulated Amortization	(81,101)	(79,875)
Foreign Currency Translation	(63)	135
Intangible assets, net	20,036	20,640
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	37,251	35,821
Accumulated Amortization	(14,527)	(12,634)
Foreign Currency Translation	171	280
Intangible assets, net	22,895	23,467
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	30,396	27,536
Accumulated Amortization	(25,551)	(25,290)
Foreign Currency Translation	46	36
Intangible assets, net	$ 4,891	$ 2,282

Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	May 30, 2014	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		$ 5,110
Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 38,850		$ 38,850
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		820
Completed Technology [Member] \| Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets			15,700
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		1,430
Customer Relationships [Member] \| Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 21,250		21,250
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets		$ 2,860
Patents, Trademarks, Trade Names and Other [Member] \| Granville-Phillips [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets			$ 1,900

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 1,709	$ 1,044	$ 3,380	$ 1,454

Goodwill and Intangible Assets - Estimated Amortization Expense (Detail) $ in Thousands	Jun. 30, 2015 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2015 (remaining)	$ 3,399
2016	6,696
2017	6,624
2018	6,608
2019	6,595
2020	6,510
Thereafter	$ 11,390

Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Other Current Assets:
Prepaid income tax	$ 6,482	$ 4,698
Income tax receivable	6,081	10,322
Other	15,640	12,492
Total other current assets	28,203	27,512
Other Assets:
Deferred tax assets, net	7,583	7,202
Long-term income tax receivable	8,258	8,092
Other	2,037	1,912
Total other assets	$ 17,878	$ 17,206

Other Liabilities - Schedule of Other Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Other Current Liabilities:
Customer prepayments	$ 8,060	$ 2,746
Product warranties	5,876	6,266	$ 7,117	$ 6,956
Deferred revenue	6,194	8,283
Other	25,538	18,494
Total other current liabilities	45,668	35,789
Other Liabilities:
Long-term income tax payable	20,482	20,203
Accrued compensation	12,628	12,068
Other	5,809	6,324
Total other liabilities	$ 38,919	$ 38,595

Debt - Additional Information (Detail) - Japan [Member]	6 Months Ended
Debt - Additional Information (Detail) - Japan [Member]	Jun. 30, 2015 USD ($) Institution	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Number of financial institutions for available lines of credit and borrowing arrangements \| Institution	2
Aggregate borrowings expire and renewed	3 month intervals
Total available line of credit	$ 18,768,000
Total borrowings outstanding	$ 0	$ 0

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Product Warranties - Product Warranty Activities (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Guarantees [Abstract]
Beginning of period	$ 6,266	$ 6,956
Provision for product warranties	2,095	1,589
Direct charges to warranty liability	(2,434)	(1,476)
Foreign currency translation	(51)	48
End of period	$ 5,876	$ 7,117

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Taxes [Line Items]
Effective tax rate	29.10%		31.30%	29.00%	23.90%
Gross unrecognized tax benefits excluding interest and penalties	$ 19,508			$ 19,508		$ 19,610
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate	11,524			11,524
Accrued interest on unrecognized tax benefits	$ 701			701		$ 578
Unrecognized tax benefits related to various U.S. federal, state and foreign tax positions				$ 950
Income tax examination, description				The Company and its subsidiaries are subject to examination by federal, state and foreign tax authorities. The Internal Revenue Service commenced an examination of the Company's U.S. federal tax filings for tax years 2011 through 2013 during the quarter ended March 31, 2015.
Earliest Tax Year [Member]
Income Taxes [Line Items]
Income tax examination period		2011
Earliest Tax Year [Member] \| Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Open tax year		2011
Latest Tax Year [Member]
Income Taxes [Line Items]
Income tax examination period		2013

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net income	$ 33,220	$ 21,224	$ 67,006	$ 52,469
Denominator:
Shares used in net income per common share - basic	53,384,000	53,361,000	53,299,000	53,386,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan	205,000	176,000	260,000	271,000
Shares used in net income per common share - diluted	53,589,000	53,537,000	53,559,000	53,657,000
Net income per common share:
Basic	$ 0.62	$ 0.40	$ 1.26	$ 0.98
Diluted	$ 0.62	$ 0.40	$ 1.25	$ 0.98

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Stock options and restricted stock units outstanding	772,000	830,000	772,000	830,000
Number of shares excluded from computation of diluted earnings per share	0	90	0	800

Stockholder's Equity - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 27, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jul. 25, 2011
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase						$ 200,000,000
Stock repurchase, shares				116,000	728,000
Value of shares repurchased				$ 4,341,000	$ 20,809,000
Average price of repurchased shares				$ 37.55	$ 28.59
Cash dividends per common share		$ 0.170	$ 0.165	$ 0.335	$ 0.325
Dividend payment to common shareholders				$ 17,868,000	$ 17,326,000
Dividend Declared One [Member]
Stockholders Equity [Line Items]
Cash dividends per common share				$ 0.165	$ 0.160
Dividend payment to common shareholders				$ 17,868,000	$ 17,326,000
Dividend Declared Two [Member]
Stockholders Equity [Line Items]
Cash dividends per common share				$ 0.170	$ 0.165
Dividend payment to common shareholders				$ 17,868,000	$ 17,326,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Jul. 27, 2015
Cash dividend to be paid	$ 0.17
Dividend to be paid date	Sep. 11, 2015
Dividend declared, shareholders of record date	Aug. 31, 2015

Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015 Segment Product Customer
Segment Reporting [Abstract]
Number of reportable segments \| Segment	4
Number of product groups \| Product	3
Number of customers with net revenues greater than 10% of total net revenues \| Customer	2

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Total net revenues	$ 217,966	$ 184,697	$ 431,805	$ 391,050
Operating Segments [Member] \| Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Total net revenues	178,966	146,479	358,199	311,977
Operating Segments [Member] \| Global Service [Member]
Segment Reporting Information [Line Items]
Total net revenues	29,685	27,231	57,428	52,398
Operating Segments [Member] \| Asia Region Sales [Member]
Segment Reporting Information [Line Items]
Total net revenues	56,777	40,790	112,154	92,889
Operating Segments [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Total net revenues	18,796	19,183	40,012	40,076
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ (66,258)	$ (48,986)	$ (135,988)	$ (106,290)

Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Gross profit	$ 98,798	$ 79,635	$ 195,844	$ 169,007
Research and development	17,567	15,421	34,247	31,039
Selling, general and administrative	33,269	32,239	64,136	66,830
Acquisition costs		271	30	499
Restructuring	219		1,007	747
Amortization of intangible assets	1,709	1,044	3,380	1,454
Income from operations	46,034	30,660	93,044	68,438
Net interest income	790	231	1,294	466
Income before income taxes	46,824	30,891	94,338	68,904
Provision for income taxes	13,604	9,667	27,332	16,435
Net income	33,220	21,224	67,006	52,469
Operating Segments [Member] \| Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Gross profit	82,552	59,918	161,240	127,025
Operating Segments [Member] \| Global Service [Member]
Segment Reporting Information [Line Items]
Gross profit	10,366	9,683	19,968	18,080
Operating Segments [Member] \| Asia Region Sales [Member]
Segment Reporting Information [Line Items]
Gross profit	7,815	6,319	14,736	15,396
Operating Segments [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Gross profit	5,697	6,678	12,539	13,425
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Gross profit	$ (7,632)	$ (2,963)	$ (12,639)	$ (4,919)

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Capital expenditures	$ 2,830	$ 4,157	$ 5,334	$ 7,255
Depreciation and amortization	5,550	4,815	11,082	8,965
Operating Segments [Member] \| Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1,622	1,131	3,144	3,705
Depreciation and amortization	4,305	3,528	8,552	6,454
Operating Segments [Member] \| Global Service [Member]
Segment Reporting Information [Line Items]
Capital expenditures	163	419	285	589
Depreciation and amortization	254	267	510	539
Operating Segments [Member] \| Asia Region Sales [Member]
Segment Reporting Information [Line Items]
Capital expenditures	51	151	93	192
Depreciation and amortization	88	101	173	200
Operating Segments [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	162	1,462	236	1,537
Depreciation and amortization	268	251	578	459
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Capital expenditures	832	994	1,576	1,232
Depreciation and amortization	$ 635	$ 668	$ 1,269	$ 1,313

Business Segment, Geographic Area, Product and Significant Customer Information - Goodwill Associated with Reportable Segments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Goodwill	$ 200,212	$ 192,381	$ 150,909
Operating Segments [Member] \| Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Goodwill	174,344	166,946
Operating Segments [Member] \| Global Service [Member]
Segment Reporting Information [Line Items]
Goodwill	19,826	19,728
Operating Segments [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Goodwill	6,228	6,228
Foreign Currency Translation [Member] \| Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Goodwill	$ (186)	$ (521)

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue from External Customer [Line Items]
Net sales from product groups	$ 217,966	$ 184,697	$ 431,805	$ 391,050
Instruments, Control and Vacuum Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	110,441	90,250	220,877	191,907
Power and Reactive Gas Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	92,977	79,360	181,476	169,962
Analytical Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 14,548	$ 15,087	$ 29,452	$ 29,181

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 217,966	$ 184,697	$ 431,805	$ 391,050
Long-lived assets	71,936		71,936		$ 74,687
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	123,413	107,931	243,594	225,309
Long-lived assets	56,699		56,699		57,701
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	27,349	19,536	59,421	50,266
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	17,046	14,416	34,302	31,343
Asia (Excluding Korea and Japan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	30,743	24,002	54,426	45,765
Long-lived assets	9,520		9,520		10,887
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	19,415	$ 18,812	40,062	$ 38,367
Long-lived assets	$ 5,717		$ 5,717		$ 6,099

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Customer A [Member]
Revenue, Major Customer [Line Items]
Percentage of total net revenues	18.10%	18.90%	17.80%	19.60%
Customer B [Member]
Revenue, Major Customer [Line Items]
Percentage of total net revenues	13.20%	13.80%	12.70%	13.40%

Restructuring - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($) People	Jun. 30, 2015 USD ($) People	Jun. 30, 2014 USD ($) People
Reorganizations [Abstract]
Charged to expense \| $	$ 219	$ 1,007	$ 747
Approximate number of workforce reduction from the company's headcount \| People	123	123	75

Restructuring - Schedule of Company's Restructuring Activity (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Restructuring and Related Activities [Abstract]
Balance at December 31		$ 92
Charged to expense	$ 219	1,007	$ 747
Payments		(924)
Balance at June 30	$ 175	$ 175