MKS Instruments (MKSI) 10-Q 4 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 28, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	MKSI
Entity Registrant Name	MKS INSTRUMENTS INC
Entity Central Index Key	1,049,502
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		53,257,381

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 195,147	$ 305,437
Short-term investments	196,842	129,594
Trade accounts receivable, net	115,988	106,362
Inventories, net	168,079	155,169
Deferred income taxes	14,412	14,017
Other current assets	28,894	27,512
Total current assets	719,362	738,091
Property, plant and equipment, net	69,193	72,776
Long-term investments	240,908	157,201
Goodwill	199,562	192,381
Intangible assets, net	45,647	46,389
Other assets	18,673	17,206
Total assets	1,293,345	1,224,044
Current liabilities:
Accounts payable	26,326	34,166
Accrued compensation	29,172	26,970
Income taxes payable	9,279	6,702
Other current liabilities	42,835	35,789
Total current liabilities	107,612	103,627
Other liabilities	$ 39,061	$ 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; 53,255,873 and 53,154,666 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	$ 113	$ 113
Additional paid-in capital	741,423	734,732
Retained earnings	413,419	349,061
Accumulated other comprehensive loss	(8,283)	(2,084)
Total stockholders' equity	1,146,672	1,081,822
Total liabilities and stockholders' equity	$ 1,293,345	$ 1,224,044

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 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	53,255,873	53,154,666
Common Stock, shares outstanding	53,255,873	53,154,666

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net revenues:
Products		$ 179,441	$ 158,520	$ 553,818	$ 497,172
Services		29,891	28,278	87,319	80,676
Total net revenues		209,332	186,798	641,137	577,848
Cost of revenues:
Cost of products		95,710	89,181	294,211	276,905
Cost of services		19,393	18,292	56,853	52,611
Total cost of revenues (exclusive of amortization shown separately below)		115,103	107,473	351,064	329,516
Gross profit		94,229	79,325	290,073	248,332
Research and development		17,217	15,827	51,464	46,866
Selling, general and administrative		33,396	32,365	97,532	99,195
Acquisition costs				30	499
Restructuring		562	1,223	1,569	1,970
Amortization of intangible assets		1,691	1,760	5,071	3,214
Income from operations		41,363	28,150	134,407	96,588
Interest income		778	399	2,147	895
Interest expense		57	5	132	35
Income before income taxes		42,084	28,544	136,422	97,448
Provision (benefit) for income taxes		12,315	(573)	39,647	15,862
Net income		29,769	29,117	96,775	81,586
Other comprehensive income (loss):
Changes in value of financial instruments designated as cash flow hedges, net of tax expense	[1]	939	1,302	2	458
Foreign currency translation adjustments, net of tax of $0		(3,623)	(9,598)	(6,217)	(7,604)
Unrealized gain (loss) on investments, net of tax expense (benefit)	[2]	100	(71)	16	(29)
Total comprehensive income		$ 27,185	$ 20,750	$ 90,576	$ 74,411
Net income per share:
Basic		$ 0.56	$ 0.55	$ 1.82	$ 1.53
Diluted		0.56	0.55	1.81	1.52
Cash dividends per common share		$ 0.170	$ 0.165	$ 0.505	$ 0.490
Weighted average common shares outstanding:
Basic		53,314	53,054	53,304	53,276
Diluted		53,568	53,310	53,562	53,541
[1]	Tax expense was $548 and $671 for the three months ended September 30, 2015 and 2014, respectively. Tax expense was $20 and $134 for the nine months ended September 30, 2015 and 2014, respectively.
[2]	Tax expense (benefit) was $59 and $(37) for the three months ended September 30, 2015 and 2014, respectively. Tax expense (benefit) was $221 and $(8) for the nine months ended September 30, 2015 and 2014, respectively.

Consolidated Statements of Ope5

Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Tax expense on changes in value of financial instruments designated as cash flow hedges	$ 548	$ 671	$ 20	$ 134
Tax on foreign currency translation adjustments	0	0	0	0
Tax expense (benefit) on unrealized (loss) gain on investments	$ 59	$ (37)	$ 221	$ (8)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 96,775	$ 81,586
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,606	14,757
Stock-based compensation	10,025	8,751
Provision for excess and obsolete inventory	9,235	8,707
Provision for bad debt	(358)	450
Deferred income taxes	(2,153)	474
Excess tax benefits from stock-based compensation	(884)	(416)
Other	248	24
Changes in operating assets and liabilities:
Trade accounts receivable	(11,424)	9,252
Inventories	(25,219)	(14,476)
Income taxes	10,461	(24,865)
Other current assets	(7,935)	(3,064)
Accrued compensation	3,619	(14,079)
Other current and non-current liabilities	4,557	9,904
Accounts payable	(7,542)	(9,168)
Other assets	(441)	(137)
Net cash provided by operating activities	95,570	67,700
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(9,910)	(86,950)
Purchases of investments	(318,340)	(307,355)
Maturities of investments	131,004	211,385
Sales of investments	35,720	182,011
Proceeds from sale of property, plant and equipment	8	1,508
Purchases of property, plant and equipment	(8,831)	(9,362)
Other		53
Net cash used in investing activities	(170,349)	(8,710)
Cash flows from financing activities:
Proceeds from short-term borrowings	2,020
Payments of short-term borrowings	(2,020)
Repurchase of common stock	(8,866)	(20,809)
Net payments related to employee stock awards	(800)	457
Dividend payments to common stockholders	(26,928)	(26,081)
Excess tax benefits from stock-based compensation	884	416
Net cash used in financing activities	(35,710)	(46,017)
Effect of exchange rate changes on cash and cash equivalents	199	(6,419)
(Decrease) increase in cash and cash equivalents	(110,290)	6,554
Cash and cash equivalents at beginning of period	305,437	288,902
Cash and cash equivalents at end of period	$ 195,147	$ 295,456

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1) Basis of Presentation The terms “MKS” and the “Company” refer to MKS Instruments, Inc. and its subsidiaries. The interim financial data as of September 30, 2015 and for the three and nine months ended September 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 Pron

Recently Issued Accounting Pronouncements	9 Months Ended
	Sep. 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.

Investments

Investments	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Investments	3) Investments The fair value of short-term investments with maturities or estimated lives of one year or less consists of the following: September 30, 2015 December 31, 2014 Available-for-sale investments: Time deposits and certificates of deposit $ 21,152 $ 20,900 Bankers’ acceptance drafts 266 82 Commercial paper 1,446 — Corporate obligations 75,433 24,020 Municipal bonds 4,959 2,099 U.S. agency obligations 93,586 82,493 $ 196,842 $ 129,594 The fair value of long-term investments with maturities of more than one year consists of the following: September 30, 2015 December 31, 2014 Available-for-sale investments: Time deposits and certificates of deposit $ — $ 48 Asset-backed securities 134,917 75,674 Corporate obligations 93,990 64,669 Municipal bonds 3,422 1,254 U.S. agency obligations 8,579 15,556 $ 240,908 $ 157,201 The following tables show the gross unrealized gains and (losses) aggregated by investment category for short-term and long-term As of September 30, 2015: Cost Gross Gross Estimated Short-term investments: Time deposits and certificates of deposit $ 21,152 $ — $ — $ 21,152 Bankers’ acceptance drafts 266 — — 266 Commercial paper 1,446 — — 1,446 Corporate obligations 75,448 9 (24 ) 75,433 Municipal bonds 4,953 6 — 4,959 U.S. agency obligations 93,558 36 (8 ) 93,586 $ 196,823 $ 51 $ (32 ) $ 196,842 Long-term investments: Asset-backed securities $ 134,914 $ 71 $ (68 ) $ 134,917 Corporate obligations 94,131 39 (180 ) 93,990 Municipal bonds 3,400 27 (5 ) 3,422 U.S. agency obligations 8,576 3 — 8,579 $ 241,021 $ 140 $ (253 ) $ 240,908 As of December 31, 2014: Cost Gross Gross Estimated 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 nine months ended September 30, 2015 and 2014. 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.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 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 September 30, 2015 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description September 30, 2015 Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 100,637 $ 100,637 $ — $ — Bankers’ acceptance drafts 90 — 90 — Available-for-sale investments: Bankers’ acceptance drafts 266 — 266 — Time deposits and certificates of deposit 21,152 — 21,152 — Commercial paper 1,446 — 1,446 — Asset-backed securities 134,917 — 134,917 — Corporate obligations 169,423 — 169,423 — Municipal bonds 8,381 — 8,381 — U.S. agency obligations 102,165 — 102,165 — Derivatives – currency forward contracts 2,185 — 2,185 — Total assets $ 540,662 $ 100,637 $ 440,025 $ — Liabilities: Derivatives – currency forward contracts $ 307 $ — $ 307 $ — Reported as follows: Assets: Cash and cash equivalents (1) $ 100,727 $ 100,637 $ 90 $ — Short-term investments 196,842 — 196,842 — Other current assets 2,185 — 2,185 — Total current assets $ 299,754 $ 100,637 $ 199,117 $ — Long-term investments $ 240,908 $ — $ 240,908 $ — Liabilities: Other current liabilities $ 307 $ — $ 307 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $93,429 and non-negotiable time deposits of $991 as of September 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 Significant Other Significant 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 September 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

Derivatives	9 Months Ended
	Sep. 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, for which no collateral is required. The Company has policies to monitor the credit risk of these counterparties. While there can be no assurance, the Company does not anticipate any material non-performance by any of these counterparties. 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 September 30, 2015 and December 31, 2014, the Company had outstanding forward foreign exchange contracts with gross notional values of $58,457 and $28,650, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of September 30, 2015 and December 31, 2014: September 30, 2015 Currency Hedged (Buy/Sell) Gross Notional Fair Value (1) U.S. Dollar/Japanese Yen $ 18,089 $ (198 ) U.S. Dollar/South Korean Won 26,614 1,660 U.S. Dollar/Euro 3,782 (44 ) U.S. Dollar/U.K. Pound Sterling 2,527 15 U.S. Dollar/Taiwan Dollar 7,445 445 Total $ 58,457 $ 1,878 (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 Fair Value (1) 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 amount included in the consolidated balance sheet. The following table provides a summary of the fair value amounts of the Company’s derivative instruments: September 30, 2015 December 31, 2014 Derivative assets: Forward exchange contracts $ 2,185 $ 1,966 Derivative liabilities: Forward exchange contracts (307 ) — Total net derivative asset designated as hedging instruments (1) $ 1,878 $ 1,966 (1) The derivative asset of $2,185 and derivative liability of $307 are classified in other current assets and other current liabilities in the consolidated balance sheet as of September 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 September 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 gains (losses) on derivatives designated as hedging instruments: Three Months Ended Nine Months Ended Derivatives Designated as Cash Flow Hedging Instruments 2015 2014 2015 2014 Forward exchange contracts: Net gain (loss) recognized in OCI (1) $ 1,148 $ 2,071 $ (2,372 ) $ 689 Net gain (loss) reclassified from accumulated OCI into income (2) $ 857 $ (352 ) $ 2,766 $ (145 ) (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 nine months ended September 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 gains (losses) on derivatives not designated as hedging instruments: Three Months Ended Nine Months Ended Derivatives Not Designated as Hedging Instruments 2015 2014 2015 2014 Forward exchange contracts: Net gain (loss) recognized in income (1) $ 116 $ (70 ) $ 1,331 $ (168 ) (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 gains or losses from these derivatives are recorded immediately in selling, general and administrative expenses.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Inventories	6) Inventories Inventories consist of the following: September 30, 2015 December 31, 2014 Raw materials $ 85,313 $ 81,121 Work-in-process 25,662 26,604 Finished goods 57,104 47,444 $ 168,079 $ 155,169

Acquisitions

Acquisitions	9 Months Ended
	Sep. 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 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, the excess amount of which 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 nine months ended September 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 September 30, 2015, were immaterial. Granville-Phillips On May 30, 2014, the Company acquired Granville-Phillips (“GP”), a division of Brooks Automation, Inc., 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 aligned with the Company’s 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 The entire purchase price was deductible for tax purposes. The following table reflects the allocation of the acquired intangible assets and related estimates of useful lives. These acquired intangibles are being 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 This acquisition resulted in a purchase price that exceeded the estimated fair value of tangible and intangible assets, the excess amount of 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.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 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 nine months ended September 30, 2015 and year ended December 31, 2014 were as follows: Nine Months Ended September 30, Twelve Months Ended December 31, 2015 2014 Gross Accumulated Net Gross Accumulated 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 (836 ) — (836 ) (521 ) — (521 ) Ending balance at September 30, 2015 and December 31, 2014 $ 338,976 $ (139,414 ) $ 199,562 $ 331,795 $ (139,414 ) $ 192,381 (1) During 2015, the Company recorded $7,042 of goodwill related to the 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 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 September 30, 2015: Gross Accumulated Foreign Net Completed technology (1) $ 101,200 $ (81,715 ) $ (286 ) $ 19,199 Customer relationships (1) 37,251 (15,435 ) (49 ) 21,767 Patents, trademarks, trade names and other (1) 30,396 (25,720 ) 5 4,681 $ 168,847 $ (122,870 ) $ (330 ) $ 45,647 (1) During the three months ended March 31, 2015, the Company recorded $5,110 of separately identified intangible assets related to the acquisition of Precisive, 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 Foreign 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 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 nine months ended September 30, 2015 was $1,691 and $5,071, respectively. Aggregate amortization expense related to acquired intangibles for the three and nine months ended September 30, 2014 was $1,760 and $3,214, respectively. Estimated amortization expense for each of the remaining fiscal years is as follows: Year Amount 2015 (remaining) $ 1,686 2016 6,632 2017 6,551 2018 6,536 2019 6,494 2020 6,440 Thereafter 11,308

Other Assets

Other Assets	9 Months Ended
	Sep. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	9) Other Assets September 30, 2015 December 31, 2014 Other Current Assets: Prepaid income tax $ 6,505 $ 4,698 VAT receivable 4,011 3,417 Income tax receivable 3,665 10,322 Other 14,713 9,075 Total other current assets $ 28,894 $ 27,512 Other Assets: Deferred tax assets, net $ 8,042 $ 7,202 Long-term income tax receivable 8,341 8,092 Other 2,290 1,912 Total other assets $ 18,673 $ 17,206

Other Liabilities

Other Liabilities	9 Months Ended
	Sep. 30, 2015
Other Liabilities Disclosure [Abstract]
Other Liabilities	10) Other Liabilities September 30, 2015 December 31, 2014 Other Current Liabilities: VAT payable $ 6,766 $ 3,483 Customer prepayments 4,127 2,746 Product warranties 5,837 6,266 Deferred revenue 5,812 8,283 Other 20,293 15,011 Total other current liabilities $ 42,835 $ 35,789 Other Liabilities: Long-term income tax payable $ 20,817 $ 20,203 Accrued compensation 13,067 12,068 Other 5,177 6,324 Total other liabilities $ 39,061 $ 38,595

Debt

Debt	9 Months Ended
	Sep. 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 September 30, 2015 of up to an equivalent of $19,208 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 September 30, 2015 and December 31, 2014.

Product Warranties

Product Warranties	9 Months Ended
	Sep. 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: Nine Months Ended September 30, 2015 2014 Beginning of period $ 6,266 $ 6,956 Provision for product warranties 3,527 1,880 Direct charges to warranty liability (3,859 ) (2,119 ) Foreign currency translation (97 ) (28 ) End of period $ 5,837 $ 6,689

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	13) Income Taxes The Company’s effective tax rate for the three and nine months ended September 30, 2015 was 29.3% and 29.1%, respectively. The effective tax rate for the three and nine months ended September 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 nine months ended September 30, 2014 was (2.0)% and 16.3%, respectively. The effective tax rate for the three and nine months ended September 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 foreign tax examinations in the first and third quarters of 2014. The effective tax rate for the three and nine months ended September 30, 2014 also benefited from a third quarter discrete release of income tax reserves related to the expiration of the statute of limitations for a previously open tax year and a third quarter discrete benefit resulting from foreign tax credits recognized on the payment of a dividend from a foreign subsidiary. 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 also had an impact in reducing the effective tax rate in the three and nine months ended September 30, 2014. As of September 30, 2015, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $19,699. At December 31, 2014, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $19,610. The net increase from December 31, 2014 was primarily attributable to an increase in the reserve for domestic production activities. As of September 30, 2015, if these benefits were recognized in a future period, the timing of which is not estimable, the net unrecognized tax benefit of $11,714, excluding interest and penalties, would impact the Company’s effective tax rate. The Company accrues interest expense, and if applicable, penalties, for any uncertain tax positions. Interest and penalties are classified as a component of income tax expense. As of September 30, 2015 and December 31, 2014, the Company had accrued interest on unrecognized tax benefits of approximately $763 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

Net Income Per Share	9 Months Ended
	Sep. 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 Nine Months Ended 2015 2014 2015 2014 Numerator: Net income $ 29,769 $ 29,117 $ 96,775 $ 81,586 Denominator: Shares used in net income per common share – basic 53,314,000 53,054,000 53,304,000 53,276,000 Effect of dilutive securities: Stock options, restricted stock and employee stock purchase plan 254,000 256,000 258,000 265,000 Shares used in net income per common share – diluted 53,568,000 53,310,000 53,562,000 53,541,000 Net income per common share: Basic $ 0.56 $ 0.55 $ 1.82 $ 1.53 Diluted $ 0.56 $ 0.55 $ 1.81 $ 1.52 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 September 30, 2015, stock options and restricted stock units related to an aggregate of approximately 752,000 shares were outstanding. For the three and nine months ended September 30, 2015, there were no shares of restricted stock units and stock options that were excluded from the computation of diluted weighted-average shares outstanding that would have had an anti-dilutive effect on EPS. As of September 30, 2014, stock options and restricted stock units related to an aggregate of approximately 769,000 shares were outstanding. For the three and nine months ended September 30, 2014, the potential dilutive effect of approximately 64 and 534 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 had an anti-dilutive effect on EPS.

Stockholder's Equity

Stockholder's Equity	9 Months Ended
	Sep. 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 nine months ended September 30, 2015, the Company repurchased approximately 244,000 shares of its common stock for $8,866, or an average price of $36.32 per share. During the nine months ended September 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 nine months ended September 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 and third quarters of 2015, which dividends totaled $26,928. During the nine months ended September 30, 2014, the Board of Directors authorized a cash dividend of $0.16 per share during the first quarter of 2014 and a cash dividend of $0.165 during the second and third quarters of 2014, which dividends totaled $26,081. On October 26, 2015, our Board of Directors declared a quarterly cash dividend of $0.17 per share to be paid on December 11, 2015 to shareholders of record as of November 30, 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.

Business Segment, Geographic Ar

Business Segment, Geographic Area, Product and Significant Customer Information	9 Months Ended
	Sep. 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 current structure still reflects four reportable segments; however, the composition of the segments has changed. The Company’s current 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 that 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 nine months ended September 30, 2014 and as of December 31, 2014 reflect the current 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 Nine Months Ended 2015 2014 2015 2014 Advanced Manufacturing Capital Equipment $ 174,101 $ 146,360 $ 532,300 $ 458,337 Global Service 29,891 28,278 87,319 80,676 Asia Region Sales (1) 46,733 40,549 158,887 133,438 Other 19,289 21,444 59,301 61,520 Corporate and Eliminations (60,682 ) (49,833 ) (196,670 ) (156,123 ) $ 209,332 $ 186,798 $ 641,137 $ 577,848 The following is a reconciliation of segment gross profit to consolidated net income: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Gross profit by reportable segment: Advanced Manufacturing Capital Equipment $ 76,026 $ 59,285 $ 237,267 $ 186,310 Global Service 10,498 9,985 30,466 28,065 Asia Region Sales (1) 7,151 5,021 21,887 20,417 Other 5,466 7,490 18,005 20,915 Corporate and Eliminations (4,912 ) (2,456 ) (17,552 ) (7,375 ) Total gross profit by reportable segment 94,229 79,325 290,073 248,332 Operating expenses: Research and development 17,217 15,827 51,464 46,866 Selling, general and administrative 33,396 32,365 97,532 99,195 Acquisition costs — — 30 499 Restructuring 562 1,223 1,569 1,970 Amortization of intangible assets 1,691 1,760 5,071 3,214 Income from operations 41,363 28,150 134,407 96,588 Net interest income 721 394 2,015 860 Income before income taxes 42,084 28,544 136,422 97,448 Provision (benefit) for income taxes 12,315 (573 ) 39,647 15,862 Net income $ 29,769 $ 29,117 $ 96,775 $ 81,586 (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 nine months ended September 30, 2015 and 2014: Advanced Global Service Asia Region Other Corporate and Total Three Months Ended September 30, 2015: Capital expenditures $ 2,169 $ 265 $ 256 $ 150 $ 657 $ 3,497 Nine Months Ended September 30, 2015: Capital expenditures $ 5,313 $ 550 $ 349 $ 386 $ 2,233 $ 8,831 Advanced Global Service Asia Region Other Corporate and Total Three Months Ended September 30, 2014: Capital expenditures $ 1,239 $ 198 $ 229 $ 63 $ 378 $ 2,107 Nine Months Ended September 30, 2014: Capital expenditures $ 4,944 $ 787 $ 421 $ 1,600 $ 1,610 $ 9,362 The following is depreciation and amortization by reportable segment for the three and nine months ended September 30, 2015 and 2014: Advanced Global Service Asia Region Other Corporate and Total Three Months Ended September 30, 2015: Depreciation and amortization $ 4,240 $ 249 $ 86 $ 268 $ 681 $ 5,524 Nine Months Ended September 30, 2015: Depreciation and amortization $ 12,792 $ 759 $ 259 $ 846 $ 1,950 $ 16,606 Advanced Global Service Asia Region Other Corporate and Total Three Months Ended September 30, 2014: Depreciation and amortization $ 4,403 $ 280 $ 101 $ 307 $ 701 $ 5,792 Nine Months Ended September 30, 2014: Depreciation and amortization $ 10,857 $ 819 $ 301 $ 766 $ 2,014 $ 14,757 In connection with the implementation of the current 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: September 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 (836 ) (521 ) Total goodwill $ 199,562 $ 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 September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Instruments, Control and Vacuum Products $ 98,614 $ 93,027 $ 319,491 $ 284,934 Power and Reactive Gas Products 95,311 79,228 276,787 249,190 Analytical Solutions Products 15,407 14,543 44,859 43,724 $ 209,332 $ 186,798 $ 641,137 $ 577,848 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 September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Net revenues: United States $ 122,348 $ 107,583 $ 365,942 $ 332,892 Korea 27,760 20,540 87,181 70,806 Japan 14,699 14,798 49,001 46,141 Asia (excluding Korea and Japan) 24,833 22,539 79,259 68,304 Europe 19,692 21,338 59,754 59,705 $ 209,332 $ 186,798 $ 641,137 $ 577,848 September 30, 2015 December 31, 2014 Long-lived assets: (1) United States $ 56,570 $ 57,701 Europe 5,681 6,099 Asia 9,232 10,887 $ 71,483 $ 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 September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Customer A 18 % 20 % 18 % 20 % Customer B 16 % 11 % 14 % 13 %

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2015
Restructuring and Related Activities [Abstract]
Restructuring	17) Restructuring The Company recorded restructuring charges of $562 and $1,569 during the three and nine months ended September 30, 2015, respectively. The restructuring charges for the three months ended September 30, 2015 related to severance costs from a reduction in workforce related to the consolidation of certain foreign manufacturing locations. The restructuring charges for the nine months ended September 30, 2015 primarily related to severance costs associated with a reduction in workforce of 137 people, arising from the outsourcing of a non-core foreign manufacturing process and the consolidation of certain foreign manufacturing locations. The Company recorded restructuring charges of $1,223 and $1,970 during the three and nine months ended September 30, 2014. The restructuring charges were primarily for severance associated with the reduction in workforce of 111 people throughout the Company. The activity related to the Company’s restructuring accrual is shown below: Nine Months Ended Nine Months Ended Balance at December 31 $ 92 $ — Charged to expense 1,569 1,970 Payments (1,052 ) (1,580 ) Balance at September 30 $ 609 $ 390

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 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

Basis of Presentation (Policies)	9 Months Ended
	Sep. 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)

Investments (Tables)	9 Months Ended
	Sep. 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 one year or less consists of the following: September 30, 2015 December 31, 2014 Available-for-sale investments: Time deposits and certificates of deposit $ 21,152 $ 20,900 Bankers’ acceptance drafts 266 82 Commercial paper 1,446 — Corporate obligations 75,433 24,020 Municipal bonds 4,959 2,099 U.S. agency obligations 93,586 82,493 $ 196,842 $ 129,594 The fair value of long-term investments with maturities of more than one year consists of the following: September 30, 2015 December 31, 2014 Available-for-sale investments: Time deposits and certificates of deposit $ — $ 48 Asset-backed securities 134,917 75,674 Corporate obligations 93,990 64,669 Municipal bonds 3,422 1,254 U.S. agency obligations 8,579 15,556 $ 240,908 $ 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 As of September 30, 2015: Cost Gross Gross Estimated Short-term investments: Time deposits and certificates of deposit $ 21,152 $ — $ — $ 21,152 Bankers’ acceptance drafts 266 — — 266 Commercial paper 1,446 — — 1,446 Corporate obligations 75,448 9 (24 ) 75,433 Municipal bonds 4,953 6 — 4,959 U.S. agency obligations 93,558 36 (8 ) 93,586 $ 196,823 $ 51 $ (32 ) $ 196,842 Long-term investments: Asset-backed securities $ 134,914 $ 71 $ (68 ) $ 134,917 Corporate obligations 94,131 39 (180 ) 93,990 Municipal bonds 3,400 27 (5 ) 3,422 U.S. agency obligations 8,576 3 — 8,579 $ 241,021 $ 140 $ (253 ) $ 240,908 As of December 31, 2014: Cost Gross Gross Estimated 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

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 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 September 30, 2015 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description September 30, 2015 Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 100,637 $ 100,637 $ — $ — Bankers’ acceptance drafts 90 — 90 — Available-for-sale investments: Bankers’ acceptance drafts 266 — 266 — Time deposits and certificates of deposit 21,152 — 21,152 — Commercial paper 1,446 — 1,446 — Asset-backed securities 134,917 — 134,917 — Corporate obligations 169,423 — 169,423 — Municipal bonds 8,381 — 8,381 — U.S. agency obligations 102,165 — 102,165 — Derivatives – currency forward contracts 2,185 — 2,185 — Total assets $ 540,662 $ 100,637 $ 440,025 $ — Liabilities: Derivatives – currency forward contracts $ 307 $ — $ 307 $ — Reported as follows: Assets: Cash and cash equivalents (1) $ 100,727 $ 100,637 $ 90 $ — Short-term investments 196,842 — 196,842 — Other current assets 2,185 — 2,185 — Total current assets $ 299,754 $ 100,637 $ 199,117 $ — Long-term investments $ 240,908 $ — $ 240,908 $ — Liabilities: Other current liabilities $ 307 $ — $ 307 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $93,429 and non-negotiable time deposits of $991 as of September 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 Significant Other Significant 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)

Derivatives (Tables)	9 Months Ended
	Sep. 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 September 30, 2015 and December 31, 2014: September 30, 2015 Currency Hedged (Buy/Sell) Gross Notional Fair Value (1) U.S. Dollar/Japanese Yen $ 18,089 $ (198 ) U.S. Dollar/South Korean Won 26,614 1,660 U.S. Dollar/Euro 3,782 (44 ) U.S. Dollar/U.K. Pound Sterling 2,527 15 U.S. Dollar/Taiwan Dollar 7,445 445 Total $ 58,457 $ 1,878 (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 Fair Value (1) 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 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: September 30, 2015 December 31, 2014 Derivative assets: Forward exchange contracts $ 2,185 $ 1,966 Derivative liabilities: Forward exchange contracts (307 ) — Total net derivative asset designated as hedging instruments (1) $ 1,878 $ 1,966 (1) The derivative asset of $2,185 and derivative liability of $307 are classified in other current assets and other current liabilities in the consolidated balance sheet as of September 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.
Summary of Gains (Losses) on Derivatives Designated as Hedging Instruments	The following table provides a summary of the gains (losses) on derivatives designated as hedging instruments: Three Months Ended Nine Months Ended Derivatives Designated as Cash Flow Hedging Instruments 2015 2014 2015 2014 Forward exchange contracts: Net gain (loss) recognized in OCI (1) $ 1,148 $ 2,071 $ (2,372 ) $ 689 Net gain (loss) reclassified from accumulated OCI into income (2) $ 857 $ (352 ) $ 2,766 $ (145 ) (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 nine months ended September 30, 2015 and 2014. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial.
Summary of Gains (Losses) on Derivatives Not Designated as Hedging Instruments	The following table provides a summary of gains (losses) on derivatives not designated as hedging instruments: Three Months Ended Nine Months Ended Derivatives Not Designated as Hedging Instruments 2015 2014 2015 2014 Forward exchange contracts: Net gain (loss) recognized in income (1) $ 116 $ (70 ) $ 1,331 $ (168 ) (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 gains or losses from these derivatives are recorded immediately in selling, general and administrative expenses.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consist of the following: September 30, 2015 December 31, 2014 Raw materials $ 85,313 $ 81,121 Work-in-process 25,662 26,604 Finished goods 57,104 47,444 $ 168,079 $ 155,169

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 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	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 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 are being 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

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	The changes in the carrying amount of goodwill and accumulated impairment (loss) during the nine months ended September 30, 2015 and year ended December 31, 2014 were as follows: Nine Months Ended September 30, Twelve Months Ended December 31, 2015 2014 Gross Accumulated Net Gross Accumulated 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 (836 ) — (836 ) (521 ) — (521 ) Ending balance at September 30, 2015 and December 31, 2014 $ 338,976 $ (139,414 ) $ 199,562 $ 331,795 $ (139,414 ) $ 192,381 (1) During 2015, the Company recorded $7,042 of goodwill related to the 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 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 September 30, 2015: Gross Accumulated Foreign Net Completed technology (1) $ 101,200 $ (81,715 ) $ (286 ) $ 19,199 Customer relationships (1) 37,251 (15,435 ) (49 ) 21,767 Patents, trademarks, trade names and other (1) 30,396 (25,720 ) 5 4,681 $ 168,847 $ (122,870 ) $ (330 ) $ 45,647 (1) During the three months ended March 31, 2015, the Company recorded $5,110 of separately identified intangible assets related to the acquisition of Precisive, 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 Foreign 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 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) $ 1,686 2016 6,632 2017 6,551 2018 6,536 2019 6,494 2020 6,440 Thereafter 11,308

Other Assets (Tables)

Other Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Assets	September 30, 2015 December 31, 2014 Other Current Assets: Prepaid income tax $ 6,505 $ 4,698 VAT receivable 4,011 3,417 Income tax receivable 3,665 10,322 Other 14,713 9,075 Total other current assets $ 28,894 $ 27,512 Other Assets: Deferred tax assets, net $ 8,042 $ 7,202 Long-term income tax receivable 8,341 8,092 Other 2,290 1,912 Total other assets $ 18,673 $ 17,206

Other Liabilities (Tables)

Other Liabilities (Tables)	9 Months Ended
	Sep. 30, 2015
Other Liabilities Disclosure [Abstract]
Schedule of Other Liabilities	September 30, 2015 December 31, 2014 Other Current Liabilities: VAT payable $ 6,766 $ 3,483 Customer prepayments 4,127 2,746 Product warranties 5,837 6,266 Deferred revenue 5,812 8,283 Other 20,293 15,011 Total other current liabilities $ 42,835 $ 35,789 Other Liabilities: Long-term income tax payable $ 20,817 $ 20,203 Accrued compensation 13,067 12,068 Other 5,177 6,324 Total other liabilities $ 39,061 $ 38,595

Product Warranties (Tables)

Product Warranties (Tables)	9 Months Ended
	Sep. 30, 2015
Guarantees [Abstract]
Product Warranty Activities	Product warranty activities were as follows: Nine Months Ended September 30, 2015 2014 Beginning of period $ 6,266 $ 6,956 Provision for product warranties 3,527 1,880 Direct charges to warranty liability (3,859 ) (2,119 ) Foreign currency translation (97 ) (28 ) End of period $ 5,837 $ 6,689

Net Income Per Share (Tables)

Net Income Per Share (Tables)	9 Months Ended
	Sep. 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 Nine Months Ended 2015 2014 2015 2014 Numerator: Net income $ 29,769 $ 29,117 $ 96,775 $ 81,586 Denominator: Shares used in net income per common share – basic 53,314,000 53,054,000 53,304,000 53,276,000 Effect of dilutive securities: Stock options, restricted stock and employee stock purchase plan 254,000 256,000 258,000 265,000 Shares used in net income per common share – diluted 53,568,000 53,310,000 53,562,000 53,541,000 Net income per common share: Basic $ 0.56 $ 0.55 $ 1.82 $ 1.53 Diluted $ 0.56 $ 0.55 $ 1.81 $ 1.52

Business Segment, Geographic 36

Business Segment, Geographic Area, Product and Significant Customer Information (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Net Revenues by Reportable Segment	The following is net revenues by reportable segment: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Advanced Manufacturing Capital Equipment $ 174,101 $ 146,360 $ 532,300 $ 458,337 Global Service 29,891 28,278 87,319 80,676 Asia Region Sales (1) 46,733 40,549 158,887 133,438 Other 19,289 21,444 59,301 61,520 Corporate and Eliminations (60,682 ) (49,833 ) (196,670 ) (156,123 ) $ 209,332 $ 186,798 $ 641,137 $ 577,848
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 Nine Months Ended 2015 2014 2015 2014 Gross profit by reportable segment: Advanced Manufacturing Capital Equipment $ 76,026 $ 59,285 $ 237,267 $ 186,310 Global Service 10,498 9,985 30,466 28,065 Asia Region Sales (1) 7,151 5,021 21,887 20,417 Other 5,466 7,490 18,005 20,915 Corporate and Eliminations (4,912 ) (2,456 ) (17,552 ) (7,375 ) Total gross profit by reportable segment 94,229 79,325 290,073 248,332 Operating expenses: Research and development 17,217 15,827 51,464 46,866 Selling, general and administrative 33,396 32,365 97,532 99,195 Acquisition costs — — 30 499 Restructuring 562 1,223 1,569 1,970 Amortization of intangible assets 1,691 1,760 5,071 3,214 Income from operations 41,363 28,150 134,407 96,588 Net interest income 721 394 2,015 860 Income before income taxes 42,084 28,544 136,422 97,448 Provision (benefit) for income taxes 12,315 (573 ) 39,647 15,862 Net income $ 29,769 $ 29,117 $ 96,775 $ 81,586 (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.
Schedule of Capital Expenditures, Depreciation and Amortization Expense by Reportable Segment	The following is capital expenditures by reportable segment for the three and nine months ended September 30, 2015 and 2014: Advanced Global Service Asia Region Other Corporate and Total Three Months Ended September 30, 2015: Capital expenditures $ 2,169 $ 265 $ 256 $ 150 $ 657 $ 3,497 Nine Months Ended September 30, 2015: Capital expenditures $ 5,313 $ 550 $ 349 $ 386 $ 2,233 $ 8,831 Advanced Global Service Asia Region Other Corporate and Total Three Months Ended September 30, 2014: Capital expenditures $ 1,239 $ 198 $ 229 $ 63 $ 378 $ 2,107 Nine Months Ended September 30, 2014: Capital expenditures $ 4,944 $ 787 $ 421 $ 1,600 $ 1,610 $ 9,362 The following is depreciation and amortization by reportable segment for the three and nine months ended September 30, 2015 and 2014: Advanced Global Service Asia Region Other Corporate and Total Three Months Ended September 30, 2015: Depreciation and amortization $ 4,240 $ 249 $ 86 $ 268 $ 681 $ 5,524 Nine Months Ended September 30, 2015: Depreciation and amortization $ 12,792 $ 759 $ 259 $ 846 $ 1,950 $ 16,606 Advanced Global Service Asia Region Other Corporate and Total Three Months Ended September 30, 2014: Depreciation and amortization $ 4,403 $ 280 $ 101 $ 307 $ 701 $ 5,792 Nine Months Ended September 30, 2014: Depreciation and amortization $ 10,857 $ 819 $ 301 $ 766 $ 2,014 $ 14,757
Summary of Goodwill Associated with Reportable Segments	Goodwill associated with each of our reportable segments is as follows: September 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 (836 ) (521 ) Total goodwill $ 199,562 $ 192,381
Worldwide Net Revenue for Each Group of Products	Worldwide net revenue for each group of products is as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Instruments, Control and Vacuum Products $ 98,614 $ 93,027 $ 319,491 $ 284,934 Power and Reactive Gas Products 95,311 79,228 276,787 249,190 Analytical Solutions Products 15,407 14,543 44,859 43,724 $ 209,332 $ 186,798 $ 641,137 $ 577,848
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 September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Net revenues: United States $ 122,348 $ 107,583 $ 365,942 $ 332,892 Korea 27,760 20,540 87,181 70,806 Japan 14,699 14,798 49,001 46,141 Asia (excluding Korea and Japan) 24,833 22,539 79,259 68,304 Europe 19,692 21,338 59,754 59,705 $ 209,332 $ 186,798 $ 641,137 $ 577,848 September 30, 2015 December 31, 2014 Long-lived assets: (1) United States $ 56,570 $ 57,701 Europe 5,681 6,099 Asia 9,232 10,887 $ 71,483 $ 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 September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Customer A 18 % 20 % 18 % 20 % Customer B 16 % 11 % 14 % 13 %

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Sep. 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: Nine Months Ended Nine Months Ended Balance at December 31 $ 92 $ — Charged to expense 1,569 1,970 Payments (1,052 ) (1,580 ) Balance at September 30 $ 609 $ 390

Investments - Fair Value of Sho

Investments - Fair Value of Short-Term Available-for-Sale Investments (Detail) - Short-Term Investments [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	$ 196,842	$ 129,594
Time Deposits and Certificates of Deposit [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	21,152	20,900
Bankers' Acceptance Drafts [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	266	82
Commercial Paper [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	1,446
Corporate Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	75,433	24,020
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	4,959	2,099
U.S. Agency Obligations [Member]
Schedule of Investments [Line Items]
Fair value of available-for-sale investments	$ 93,586	$ 82,493

Investments - Fair Value of Lon

Investments - Fair Value of Long-Term Available-for-Sale Investments (Detail) - Long-Term Investments [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 240,908	$ 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	134,917	75,674
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	93,990	64,669
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	3,422	1,254
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 8,579	$ 15,556

Investments - Gross Unrealized

Investments - Gross Unrealized Gains and (Losses) Aggregated by Investment Category Short-Term and Long-Term Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	$ 196,823	$ 129,600
Investments, Gross Unrealized Gains	51	16
Investments, Gross Unrealized (Losses)	(32)	(22)
Investments, Estimated Fair Value	196,842	129,594
Short-Term Investments [Member] | Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	21,152	20,901
Investments, Gross Unrealized (Losses)		(1)
Investments, Estimated Fair Value	21,152	20,900
Short-Term Investments [Member] | Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	266	82
Investments, Estimated Fair Value	266	82
Short-Term Investments [Member] | Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	1,446
Investments, Estimated Fair Value	1,446
Short-Term Investments [Member] | Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	75,448	24,029
Investments, Gross Unrealized Gains	9	2
Investments, Gross Unrealized (Losses)	(24)	(11)
Investments, Estimated Fair Value	75,433	24,020
Short-Term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	4,953	2,100
Investments, Gross Unrealized Gains	6
Investments, Gross Unrealized (Losses)		(1)
Investments, Estimated Fair Value	4,959	2,099
Short-Term Investments [Member] | U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	93,558	82,488
Investments, Gross Unrealized Gains	36	14
Investments, Gross Unrealized (Losses)	(8)	(9)
Investments, Estimated Fair Value	93,586	82,493
Long-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	241,021	157,489
Investments, Gross Unrealized Gains	140	8
Investments, Gross Unrealized (Losses)	(253)	(296)
Investments, Estimated Fair Value	240,908	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	134,914	75,778
Investments, Gross Unrealized Gains	71	5
Investments, Gross Unrealized (Losses)	(68)	(109)
Investments, Estimated Fair Value	134,917	75,674
Long-Term Investments [Member] | Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	94,131	64,842
Investments, Gross Unrealized Gains	39	1
Investments, Gross Unrealized (Losses)	(180)	(174)
Investments, Estimated Fair Value	93,990	64,669
Long-Term Investments [Member] | Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	3,400	1,258
Investments, Gross Unrealized Gains	27
Investments, Gross Unrealized (Losses)	(5)	(4)
Investments, Estimated Fair Value	3,422	1,254
Long-Term Investments [Member] | U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	8,576	15,563
Investments, Gross Unrealized Gains	3	2
Investments, Gross Unrealized (Losses)		(9)
Investments, Estimated Fair Value	$ 8,579	$ 15,556

Investments - Additional Inform

Investments - Additional Information (Detail) - Maximum [Member]	9 Months Ended
	Sep. 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 - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts	$ 2,185	$ 1,966
Derivatives - currency forward contracts	307
Short-term investments	196,842	129,594
Other current assets	2,185	1,966
Other current liabilities	307
Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts	2,185	2,110
Total assets	540,662	418,828
Derivatives - currency forward contracts	307
Cash and cash equivalents	100,727	129,923
Short-term investments	196,842	129,594
Other current assets	2,185	2,110
Total current assets	299,754	261,627
Available-for-sale investments	240,908	157,201
Other current liabilities	307
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	100,637	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	90	131
Available-for-sale investments	266	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	21,152	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	1,446
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	134,917	75,674
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	102,165	98,049
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	100,637	129,092
Cash and cash equivalents	100,637	129,092
Total current assets	100,637	129,092
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	100,637	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	2,185	2,110
Total assets	440,025	289,736
Derivatives - currency forward contracts	307
Cash and cash equivalents	90	831
Short-term investments	196,842	129,594
Other current assets	2,185	2,110
Total current assets	199,117	132,535
Available-for-sale investments	240,908	157,201
Other current liabilities	307
Significant Other Observable Inputs (Level 2) [Member] | Bankers' Acceptance Drafts [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	90	131
Available-for-sale investments	266	82
Significant Other Observable Inputs (Level 2) [Member] | Time Deposits and Certificates of Deposit [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	21,152	20,948
Significant Other Observable Inputs (Level 2) [Member] | 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	1,446
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	134,917	75,674
Significant Other Observable Inputs (Level 2) [Member] | U.S. Agency Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	102,165	98,049
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	169,423	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	169,423	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	8,381	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	$ 8,381	$ 3,353

Fair Value Measurements - Sch43

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements	$ 93,429	$ 167,517
Non-Negotiable Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements	$ 991	$ 7,997

Derivatives - Additional Inform

Derivatives - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 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	$ 58,457	$ 28,650
Accumulated other comprehensive income realization period	12 months

Derivatives - Summary of Primar

Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 58,457	$ 28,650
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	1,878	1,966
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	18,089	8,035
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	(198)	1,107
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	26,614	12,512
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	1,660	372
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	3,782	2,060
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	(44)	185
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	2,527	1,308
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	15	70
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	7,445	4,735
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net	$ 445	$ 232

Derivatives - Summary of Fair V

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Forward exchange contracts, assets	$ 2,185	$ 1,966
Forward exchange contracts, liabilities	(307)
Total net derivative asset designated as hedging instruments	1,878	1,966
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Forward exchange contracts, assets	2,185	1,966
Forward exchange contracts, liabilities	(307)
Total net derivative asset designated as hedging instruments	$ 1,878	$ 1,966

Derivatives - Summary of Fair47

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative asset classified in other current assets	$ 2,185	$ 1,966
Derivative liability classified in other current liabilities	$ 307

Derivatives - Summary of Gains

Derivatives - Summary of Gains (Losses) on Derivatives Designated as Hedging Instruments (Detail) - Forward Exchange Contracts [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in OCI	$ 1,148	$ 2,071	$ (2,372)	$ 689
Net gain (loss) reclassified from accumulated OCI into income	$ 857	$ (352)	$ 2,766	$ (145)

Derivatives - Summary of Gain49

Derivatives - Summary of Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net gain (loss) recognized in income	$ 116	$ (70)	$ 1,331	$ (168)

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 85,313	$ 81,121
Work-in-process	25,662	26,604
Finished goods	57,104	47,444
Inventories	$ 168,079	$ 155,169

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 17, 2015	Sep. 30, 2015	Sep. 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 Estim

Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Mar. 17, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	May. 30, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill		$ 199,562		$ 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 Ac

Acquisitions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) - USD ($) $ in Thousands	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
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
Developed Technology [Member] | Granville-Phillips [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price			15,700
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
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 Asset54

Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 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	(836)	(521)
Ending balance, Goodwill Gross Carrying Amount	338,976	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	(836)	(521)
Ending balance, Goodwill Net	$ 199,562	$ 192,381

Goodwill and Intangible Asset55

Goodwill and Intangible Assets - Goodwill (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Sep. 30, 2015	Mar. 17, 2015	Dec. 31, 2014	Sep. 30, 2014	May. 30, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill		$ 199,562		$ 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 Asset56

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 168,847	$ 163,737
Accumulated Amortization	(122,870)	(117,799)
Foreign Currency Translation	(330)	451
Intangible assets, net	45,647	46,389
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	101,200	100,380
Accumulated Amortization	(81,715)	(79,875)
Foreign Currency Translation	(286)	135
Intangible assets, net	19,199	20,640
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	37,251	35,821
Accumulated Amortization	(15,435)	(12,634)
Foreign Currency Translation	(49)	280
Intangible assets, net	21,767	23,467
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	30,396	27,536
Accumulated Amortization	(25,720)	(25,290)
Foreign Currency Translation	5	36
Intangible assets, net	$ 4,681	$ 2,282

Goodwill and Intangible Asset57

Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	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 Asset58

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 1,691	$ 1,760	$ 5,071	$ 3,214

Goodwill and Intangible Asset59

Goodwill and Intangible Assets - Estimated Amortization Expense (Detail) $ in Thousands	Sep. 30, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2015 (remaining)	$ 1,686
2,016	6,632
2,017	6,551
2,018	6,536
2,019	6,494
2,020	6,440
Thereafter	$ 11,308

Other Assets - Schedule of Othe

Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Other Current Assets:
Prepaid income tax	$ 6,505	$ 4,698
VAT receivable	4,011	3,417
Income tax receivable	3,665	10,322
Other	14,713	9,075
Total other current assets	28,894	27,512
Other Assets:
Deferred tax assets, net	8,042	7,202
Long-term income tax receivable	8,341	8,092
Other	2,290	1,912
Total other assets	$ 18,673	$ 17,206

Other Liabilities - Schedule of

Other Liabilities - Schedule of Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Other Current Liabilities:
VAT payable	$ 6,766	$ 3,483
Customer prepayments	4,127	2,746
Product warranties	5,837	6,266	$ 6,689	$ 6,956
Deferred revenue	5,812	8,283
Other	20,293	15,011
Total other current liabilities	42,835	35,789
Other Liabilities:
Long-term income tax payable	20,817	20,203
Accrued compensation	13,067	12,068
Other	5,177	6,324
Total other liabilities	$ 39,061	$ 38,595

Debt - Additional Information (

Debt - Additional Information (Detail) - Japan [Member]	9 Months Ended
	Sep. 30, 2015USD ($)Institution	Dec. 31, 2014USD ($)
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	$ 19,208,000
Total borrowings outstanding	$ 0	$ 0

Product Warranties - Product Wa

Product Warranties - Product Warranty Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Guarantees [Abstract]
Beginning of period	$ 6,266	$ 6,956
Provision for product warranties	3,527	1,880
Direct charges to warranty liability	(3,859)	(2,119)
Foreign currency translation	(97)	(28)
End of period	$ 5,837	$ 6,689

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Taxes [Line Items]
Effective tax rate	29.30%		(2.00%)	29.10%	16.30%
Gross unrecognized tax benefits excluding interest and penalties	$ 19,699			$ 19,699		$ 19,610
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate	11,714			11,714
Accrued interest on unrecognized tax benefits	$ 763			$ 763		$ 578
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
Unrecognized tax benefits related to various U.S. federal, state and foreign tax positions				$ 950
Earliest Tax Year [Member]
Income Taxes [Line Items]
Income tax examination period		2,011
Earliest Tax Year [Member] | Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Open tax year		2,011
Latest Tax Year [Member]
Income Taxes [Line Items]
Income tax examination period		2,013

Net Income Per Share - Computat

Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net income	$ 29,769	$ 29,117	$ 96,775	$ 81,586
Denominator:
Shares used in net income per common share - basic	53,314,000	53,054,000	53,304,000	53,276,000
Effect of dilutive securities:
Stock options, restricted stock and employee stock purchase plan	254,000	256,000	258,000	265,000
Shares used in net income per common share - diluted	53,568,000	53,310,000	53,562,000	53,541,000
Net income per common share:
Basic	$ 0.56	$ 0.55	$ 1.82	$ 1.53
Diluted	$ 0.56	$ 0.55	$ 1.81	$ 1.52

Net Income Per Share - Addition

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Stock options and restricted stock units outstanding	752,000	769,000	752,000	769,000
Number of shares excluded from computation of diluted earnings per share	0	64	0	534

Stockholder's Equity - Addition

Stockholder's Equity - Additional Information (Detail) - USD ($)	Oct. 26, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jul. 25, 2011
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase						$ 200,000,000
Stock repurchase, shares				244,000	728,000
Value of shares repurchased				$ 8,866,000	$ 20,809,000
Average price of repurchased shares				$ 36.32	$ 28.59
Cash dividends per common share		$ 0.170	$ 0.165	$ 0.505	$ 0.490
Dividend payment to common shareholders				$ 26,928,000	$ 26,081,000
Dividend Declared One [Member]
Stockholders Equity [Line Items]
Cash dividends per common share				$ 0.165	$ 0.160
Dividend payment to common shareholders				$ 26,928,000	$ 26,081,000
Dividend Declared Two [Member]
Stockholders Equity [Line Items]
Cash dividends per common share				$ 0.170	$ 0.165
Dividend payment to common shareholders				$ 26,928,000	$ 26,081,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Oct. 26, 2015
Cash dividend to be paid	$ 0.17
Dividend to be paid date	Dec. 11, 2015
Dividend declared, shareholders of record date	Nov. 30, 2015

Business Segment, Geographic 68

Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015SegmentProductCustomer
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	2

Business Segment, Geographic 69

Business Segment, Geographic Area, Product and Significant Customer Information - Net Revenues by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total net revenues	$ 209,332	$ 186,798	$ 641,137	$ 577,848
Operating Segments [Member] | Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Total net revenues	174,101	146,360	532,300	458,337
Operating Segments [Member] | Global Service [Member]
Segment Reporting Information [Line Items]
Total net revenues	29,891	28,278	87,319	80,676
Operating Segments [Member] | Asia Region Sales [Member]
Segment Reporting Information [Line Items]
Total net revenues	46,733	40,549	158,887	133,438
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Total net revenues	19,289	21,444	59,301	61,520
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ (60,682)	$ (49,833)	$ (196,670)	$ (156,123)

Business Segment, Geographic 70

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Gross profit	$ 94,229	$ 79,325	$ 290,073	$ 248,332
Research and development	17,217	15,827	51,464	46,866
Selling, general and administrative	33,396	32,365	97,532	99,195
Acquisition costs			30	499
Restructuring	562	1,223	1,569	1,970
Amortization of intangible assets	1,691	1,760	5,071	3,214
Income from operations	41,363	28,150	134,407	96,588
Net interest income	721	394	2,015	860
Income before income taxes	42,084	28,544	136,422	97,448
Provision (benefit) for income taxes	12,315	(573)	39,647	15,862
Net income	29,769	29,117	96,775	81,586
Operating Segments [Member] | Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Gross profit	76,026	59,285	237,267	186,310
Operating Segments [Member] | Global Service [Member]
Segment Reporting Information [Line Items]
Gross profit	10,498	9,985	30,466	28,065
Operating Segments [Member] | Asia Region Sales [Member]
Segment Reporting Information [Line Items]
Gross profit	7,151	5,021	21,887	20,417
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Gross profit	5,466	7,490	18,005	20,915
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Gross profit	$ (4,912)	$ (2,456)	$ (17,552)	$ (7,375)

Business Segment, Geographic 71

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Capital expenditures	$ 3,497	$ 2,107	$ 8,831	$ 9,362
Depreciation and amortization	5,524	5,792	16,606	14,757
Operating Segments [Member] | Advanced Manufacturing Capital Equipment [Member]
Segment Reporting Information [Line Items]
Capital expenditures	2,169	1,239	5,313	4,944
Depreciation and amortization	4,240	4,403	12,792	10,857
Operating Segments [Member] | Global Service [Member]
Segment Reporting Information [Line Items]
Capital expenditures	265	198	550	787
Depreciation and amortization	249	280	759	819
Operating Segments [Member] | Asia Region Sales [Member]
Segment Reporting Information [Line Items]
Capital expenditures	256	229	349	421
Depreciation and amortization	86	101	259	301
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	150	63	386	1,600
Depreciation and amortization	268	307	846	766
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Capital expenditures	657	378	2,233	1,610
Depreciation and amortization	$ 681	$ 701	$ 1,950	$ 2,014

Business Segment, Geographic 72

Business Segment, Geographic Area, Product and Significant Customer Information - Goodwill Associated with Reportable Segments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Goodwill	$ 199,562	$ 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	$ (836)	$ (521)

Business Segment, Geographic 73

Business Segment, Geographic Area, Product and Significant Customer Information - Worldwide Net Revenue for Each Group of Products (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue from External Customer [Line Items]
Net sales from product groups	$ 209,332	$ 186,798	$ 641,137	$ 577,848
Instruments, Control and Vacuum Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	98,614	93,027	319,491	284,934
Power and Reactive Gas Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	95,311	79,228	276,787	249,190
Analytical Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 15,407	$ 14,543	$ 44,859	$ 43,724

Business Segment, Geographic 74

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 209,332	$ 186,798	$ 641,137	$ 577,848
Long-lived assets	71,483		71,483		$ 74,687
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	122,348	107,583	365,942	332,892
Long-lived assets	56,570		56,570		57,701
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	27,760	20,540	87,181	70,806
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	14,699	14,798	49,001	46,141
Asia (Excluding Korea and Japan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	24,833	22,539	79,259	68,304
Long-lived assets	9,232		9,232		10,887
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	19,692	$ 21,338	59,754	$ 59,705
Long-lived assets	$ 5,681		$ 5,681		$ 6,099

Business Segment, Geographic 75

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Customer A [Member]
Revenue, Major Customer [Line Items]
Percentage of total net revenues	18.00%	20.00%	18.00%	20.00%
Customer B [Member]
Revenue, Major Customer [Line Items]
Percentage of total net revenues	16.00%	11.00%	14.00%	13.00%

Restructuring - Additional Info

Restructuring - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)People	Sep. 30, 2014USD ($)People	Sep. 30, 2015USD ($)People	Sep. 30, 2014USD ($)People
Reorganizations [Abstract]
Restructuring expense	$ 562	$ 1,223	$ 1,569	$ 1,970
Number of workforce reduction from the company's headcount | People	137	111	137	111

Restructuring - Schedule of Com

Restructuring - Schedule of Company's Restructuring Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Restructuring and Related Activities [Abstract]
Balance at December 31			$ 92
Charged to expense	$ 562	$ 1,223	1,569	$ 1,970
Payments			(1,052)	(1,580)
Balance at September 30	$ 609	$ 390	$ 609	$ 390