MKS Instruments (MKSI) 10-Q 8 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
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		54,681,504

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018		Dec. 31, 2017
Current assets:
Cash and cash equivalents, including restricted cash	$ 340,888	[1]	$ 333,887	[2]
Short-term investments	200,614		209,434
Trade accounts receivable, net of allowance for doubtful accounts of $4,456 and $4,135 at March 31, 2018 and December 31, 2017, respectively	341,718		300,308
Inventories, net	365,709		339,081
Other current assets	59,093		53,543
Total current assets	1,308,022		1,236,253
Property, plant and equipment, net	172,802		171,782
Goodwill	593,494		591,047
Intangible assets, net	356,345		366,398
Long-term investments	10,841		10,655
Other assets	39,952		37,883
Total assets	2,481,456		2,414,018
Current liabilities:
Short-term debt	5,456		2,972
Accounts payable	92,364		82,518
Accrued compensation	62,505		96,147
Income taxes payable	31,096		21,398
Deferred revenue	14,003		12,842
Other current liabilities	85,601		73,945
Total current liabilities	291,025		289,822
Long-term debt, net	341,290		389,993
Non-current deferred taxes	61,769		61,571
Non-current accrued compensation	53,848		51,700
Other liabilities	35,184		32,025
Total liabilities	783,116		825,111
Commitments and contingencies (Note 19)
Stockholders' equity:
Preferred Stock, $0.01 par value per share, 2,000,000 shares authorized; none issued and outstanding
Common Stock, no par value, 200,000,000 shares authorized; 54,492,103 and 54,355,535 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	113		113
Additional paid-in capital	791,150		789,644
Retained earnings	892,820		795,698
Accumulated other comprehensive income	14,257		3,452
Total stockholders' equity	1,698,340		1,588,907
Total liabilities and stockholders' equity	$ 2,481,456		$ 2,414,018
[1]	Restricted cash at the end of the period was $118 and $5,274 for the three months ended March 31, 2018 and 2017, respectively.
[2]	Restricted cash at the beginning of the period was $119 and $5,287 for the three months ended March 31, 2018 and 2017, respectively.

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4,456	$ 4,135
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	54,492,103	54,355,535
Common stock, shares outstanding	54,492,103	54,355,535

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Net revenues:
Products		$ 496,677	$ 387,938
Services		57,598	49,215
Total net revenues		554,275	437,153
Cost of revenues:
Cost of products		261,321	205,834
Cost of services		30,099	25,772
Total cost of revenues (exclusive of amortization shown separately below)		291,420	231,606
Gross profit		262,855	205,547
Research and development		34,857	33,282
Selling, general and administrative		82,949	74,220
Acquisition and integration costs			1,442
Restructuring		1,220	522
Environmental costs		1,000
Amortization of intangible assets		11,190	12,501
Income from operations		131,639	83,580
Interest income		1,105	516
Interest expense		5,430	8,832
Other (expense) income		(572)	2,021
Income before income taxes		126,742	77,285
Provision for income taxes		21,621	12,225
Net income		105,121	65,060
Other comprehensive income:
Changes in value of financial instruments designated as cash flow hedges, net of tax benefit	[1]	178	(2,440)
Foreign currency translation adjustments, net of tax of $0		10,771	4,534
Unrecognized pension (loss) gain, net of tax benefit (expense)	[2]	(85)	115
Unrealized (loss) on investments, net of tax benefit	[3]	(59)	(126)
Total comprehensive income		$ 115,926	$ 67,143
Net income per share:
Basic		$ 1.93	$ 1.21
Diluted		1.90	1.18
Cash dividends per common share		$ 0.180	$ 0.175
Weighted average common shares outstanding:
Basic		54,423	53,769
Diluted		55,286	54,958
[1]	Tax benefit was $112 and $1,831 for the three months ended March 31, 2018 and 2017, respectively.
[2]	Tax benefit (expense) was $36 and $(86) for the three months ended March 31, 2018 and 2017, respectively.
[3]	Tax benefit was $17 and $94 for the three months ended March 31, 2018 and 2017, respectively.

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Tax benefit on changes in value of financial instruments designated as cash flow hedges	$ 112	$ 1,831
Tax on foreign currency translation adjustments	0	0
Tax benefit (expense) on unrecognized pension (loss) gain	36	(86)
Tax benefit on unrealized (loss) on investments	$ 17	$ 94

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Cash flows provided by operating activities:
Net income		$ 105,121	$ 65,060
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		20,492	21,833
Amortization of debt issuance costs, original issue discount and soft call premium		2,019	2,715
Stock-based compensation		10,426	8,782
Provision for excess and obsolete inventory		5,333	5,031
Provision for bad debt		335	316
Deferred income taxes		(705)	(1,809)
Other		34	85
Changes in operating assets and liabilities:
Trade accounts receivable		(37,336)	(15,215)
Inventories		(28,177)	(11,714)
Income taxes		8,822	8,067
Other current and non-current assets		(942)	(2,199)
Accrued compensation		(32,531)	(16,786)
Other current and non-current liabilities		10,544	1,082
Accounts payable		9,321	809
Net cash provided by operating activities		72,756	66,057
Cash flows provided by investing activities:
Purchases of investments		(49,753)	(42,292)
Maturities of investments		49,596	55,672
Sales of investments		8,930	21,179
Purchases of property, plant and equipment		(9,390)	(4,099)
Net cash (used in) provided by investing activities		(617)	30,460
Cash flows used in financing activities:
Proceeds from short and long-term borrowings		11,907	736
Payments on short-term borrowings		(10,274)	(1,398)
Payments on long-term borrowings		(50,000)	(51,570)
Net payments related to employee stock awards		(8,921)	(2,894)
Dividend payments to common stockholders		(9,808)	(9,419)
Net cash used in financing activities		(67,096)	(64,545)
Effect of exchange rate changes on cash and cash equivalents		1,958	(4,696)
Increase in cash and cash equivalents and restricted cash		7,001	27,276
Cash and cash equivalents, including restricted cash, at beginning of period	[1]	333,887	233,910
Cash and cash equivalents, including restricted cash, at end of period	[2]	$ 340,888	$ 261,186
[1]	Restricted cash at the beginning of the period was $119 and $5,287 for the three months ended March 31, 2018 and 2017, respectively.
[2]	Restricted cash at the end of the period was $118 and $5,274 for the three months ended March 31, 2018 and 2017, respectively.

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Restricted cash, beginning balance	$ 119	$ 5,274	$ 5,287
Restricted cash, ending balance	$ 118	$ 119	$ 5,274

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1) Basis of Presentation The terms “MKS” and the “Company” refer to MKS Instruments, Inc. and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The interim financial data as of March 31, 2018, and for the three months ended March 31, 2018 are unaudited; however, in the opinion of MKS, the interim data includes all adjustments, consisting of normal recurring adjustments, necessary for a fair statement of the results for the interim periods. The condensed consolidated balance sheet presented as of December 31, 2017 has been derived from the consolidated audited financial statements as of that date. The unaudited condensed consolidated financial statements presented herein have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and note disclosures required by United States generally accepted accounting principles (“U.S. GAAP”). The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the MKS Annual Report on Form 10-K for the year ended December 31, 2017 filed with the Securities and Exchange Commission on February 28, 2018. The preparation of these unaudited condensed consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, management evaluates its estimates and judgments, including those related to revenue recognition, stock-based compensation, inventory, intangible assets, goodwill and other long-lived assets, warranty liabilities, pension liabilities, acquisition expenses, income taxes and investments. Management bases its estimates and judgments on historical experience and on various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions. Reclassification of certain line items in prior period financial statements The Company has historically recorded the revenue and related cost of revenue for the sale of its spare parts within Products in its Statements of Operations for the Vacuum & Analysis segment. The Company has now determined that these items are better presented within revenue and related cost of revenue in Services in its Statements of Operations to align with the current manner in which the Company operates its services business, and has elected to reclassify these amounts in previously issued financial statements as shown below. This change in presentation has no impact on total revenue or total cost of revenue. Three Months Ended March 31, 2017 As previously Adjustment As re- Net revenues: Products $ 392,922 (4,984 ) $ 387,938 Services 44,231 4,984 49,215 Total net revenues 437,153 — 437,153 Cost of revenues: Cost of products 205,060 774 205,834 Cost of services 26,546 (774 ) 25,772 Total cost of revenues 231,606 — 231,606

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	2) Recently Issued Accounting Pronouncements In March 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-05, “Income Taxes (Topic 740).” This standard is an amendment that adopts the language of Securities and Exchange Commission Staff Accounting Bulletin No. 118 (“SAB 118”) and aims to address certain circumstances that may arise for registrants in accounting for the income tax effects of the Tax Cuts and Jobs Act (the “Act”) and to address any uncertainty or diversity of views in practice regarding the application of Topic 740 in situations where a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting under Topic 740 for certain income tax effects of the Act for the reporting period in which the Act was enacted. The provisions of this ASU were applied to the Company’s December 31, 2017 financial statements. The Company recorded provisional amounts with respect to the Act under SAB 118 at December 31, 2017 and March 31, 2018 and needs to complete additional analysis and receive additional guidance from the Internal Revenue Service with respect to provisions of the Act that affect the Company before the provisional determinations become final. Until the Company completes its analysis and receives additional guidance, the Company is not able to determine if the impact of ASU 2018-05 is material to the Company’s consolidated financial statements in any period. In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220).” The amendments in this standard allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Act. The provisions of this ASU are effective for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. The Company does not expect adoption of this ASU to have a material impact on the Company’s consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815).” This standard better aligns an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The provisions of this ASU are effective for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. The Company does not expect adoption of this ASU to have a material impact on the Company’s consolidated financial statements. In May 2017, the FASB issued ASU 2017-09, “Compensation-Stock Compensation (Topic 718)-Scope of Modification Accounting.” This standard provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, “Compensation-Retirement Benefits (Topic 715)-Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” This standard requires that an employer disaggregate the service cost component from the other components of net benefit cost. This standard also provides explicit guidance on how to present the service cost component and the other components of the net benefit cost in the income statement and allows only the service cost component of net benefit cost to be eligible for capitalization. The provisions of this ASU are effective for annual periods beginning after December 31, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements. In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805)-Clarifying the Definition of a Business.” This standard clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This standard also provides a more robust framework to use in determining when a set of assets and activities is a business. Because the current definition of a business is interpreted broadly and can be difficult to apply, stakeholders indicated that analyzing transactions is inefficient and costly and that the definition does not permit the use of reasonable judgment. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 230)-Restricted Cash,” an amendment to ASU 2016-15. This standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash and restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years and should be applied at the time of adoption of ASU 2016-15. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, “Income Taxes (Topic 740)-Intra-Entity Transfer of Assets Other Than Inventory.” This standard requires that an entity recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs as opposed to when the assets have been sold to an outside party. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230)-Classification of Certain Cash Receipts and Cash Payments.” This standard addresses eight specific cash flow issues with the objective of addressing the diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows under Topic 230. The provisions of this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” This standard requires the recognition of lease assets and liabilities for all leases, with certain exceptions, on the balance sheet. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. This ASU is effective for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. The FASB issued additional updates to the new standard in Topic 842 relating to a practical expedients for land easements (Update 2018-01 in January 2018). The Company has reviewed the requirements of this standard and has formulated a plan for implementation. The management team has communicated its approach to the Audit Committee and will provide regular updates as appropriate. The Company is currently working at accumulating a complete population of leases from all of its locations. The Company has selected a software repository to track all of its lease agreements and to assist in the reporting and disclosure requirements required by the standard. The Company will continue to assess and disclose the impact that this ASU will have on its consolidated financial statements, disclosures and related controls, when known. In January 2016, the FASB issued ASU 2016-01, “Financial Instruments-Overall (Subtopic 825-10)-Recognition and Measurement of Financial Assets and Financial Liabilities.” This ASU provides guidance for the recognition, measurement, presentation, and disclosure of financial instruments. The new standard revises accounting related to equity investments and the presentation of certain fair value changes for financial assets and liabilities measured at fair value. Among other things, it amends the presentation and disclosure requirements of equity securities that do not result in consolidation and are not accounted for under the equity method. Changes in the fair value of these equity securities will be recognized directly in net income. This standard is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted this ASU during the three month period ended March 31, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASC 606”). This ASU provides for a single comprehensive model to use in accounting for revenue arising from contracts with customers and has replaced most existing revenue recognition guidance in GAAP. This ASU is effective for fiscal years and interim periods within those years beginning after December 15, 2017. The two permitted transition methods under the new standard are the full retrospective method, in which case the standard would be applied to each prior reporting period presented, or the modified retrospective method, in which case the cumulative effect of applying the standard would be recognized at the date of initial application. The Company used the modified retrospective method upon adoption in the first quarter of 2018. The FASB issued additional updates to the new revenue standard in Topic 606 relating to reporting revenue on a gross versus net basis (Update 2016-08 in March 2016), identifying performance obligations and licensing arrangements (Update 2016-10 in April 2016), narrow-scope improvements and practical expedients (Update 2016-12 in May 2016), technical corrections and improvements (Update 2016-20 in December 2016), and SEC Updates (Update 2017-13 in September 2017 and Update 2017-14 in November 2017). The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements as described further in Note 3.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	3) Revenue from Contracts with Customers The Company adopted ASC 606 on January 1, 2018 using the modified retrospective method for all contracts not completed as of the date of adoption. The reported results for the three months ended March 31, 2018 reflect the application of ASC 606 guidance while the reported results for 2017 were prepared under the guidance of ASC 605, Revenue Recognition (ASC 605). The Company has recorded a net increase to opening retained earnings of $1,809 as of January 1, 2018 due to the cumulative impact of adopting ASC 606, with the impact primarily related to its service business and certain custom products. The impact to revenues for the quarter ended March 31, 2018 was immaterial as a result of applying ASC 606. The adoption of ASC 606 represents a change in accounting principle that will more closely align revenue recognition with the delivery of the Company’s goods or services and will provide financial statement readers with enhanced disclosures. To achieve this core principle, the Company applies the following five steps: • Identify the contract with a customer • Identify the performance obligations in the contract • Determine the transaction price • Allocate the transaction price to performance obligations in the contract • Recognize revenue when or as the Company satisfies a performance obligation Revenue under ASC 606 is recognized when or as obligations under the terms of a contract with the Company’s customer have been satisfied and control has transferred to the customer. The majority of the Company’s performance obligations, and associated revenue, are transferred to customers at a point in time, generally upon shipment of a product to the customer or receipt of the product by the customer and without significant judgments. Installation services are not significant and are usually completed in a short period of time (normally less than two weeks) and therefore, recorded at a point in time when the installation services are completed, rather than over time as they are not material. Extended warranty, service contracts, and repair services, which are transferred to the customer over time, are recorded as revenue as the services are performed. For repair services, the Company makes an accrual at quarter end based upon historical repair times within its product groups to record revenue based upon the estimated number of days completed to date, which is consistent with ratable recognition. Customized products with no alternative future use to the Company, and that have an enforceable right to payment for performance completed to date, are also recorded over time. The Company considers this to be a faithful depiction of the transfer to the customer of revenue over time as the work or service is performed. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring goods or providing services. Performance obligations promised in a contract are identified based on the products or services that will be transferred to the customer that are both capable of being distinct, whereby the customer can benefit from the product or service either on its own or together with other resources that are readily available from third parties or from the Company, and are distinct in the context of the contract, whereby the transfer of the product or service is separately identifiable from other promises in the contract. Sales, value add, and other taxes the Company collects concurrent with revenue-producing activities are excluded from revenue. The Company’s normal payment terms are 30 to 60 days but vary by the type and location of its customers and the products or services offered. The time between invoicing and when payment is due is not significant. For certain products or services and customer types, the Company requires payment before the products or services are delivered to the customer. None of the Company’s contracts as of March 31, 2018 contain a significant financing component. Contract assets as of January 1 and March 31, 2018 were immaterial and included in other current assets. Contracts with Multiple Performance Obligations The Company periodically enters into contracts with its customers in which a customer may purchase a combination of goods and or services, such as products with installation services or extended warranty obligations. These contracts include multiple promises that the Company evaluates to determine if the promises are separate performance obligations. Once the Company determines the performance obligations, the Company then determines the transaction price, which includes estimating the amount of variable consideration to be included in the transaction price, if any. To the extent the transaction price includes variable consideration, the Company estimates the amount of variable consideration that should be included in the transaction price utilizing either the expected value method or the most likely amount method depending on the method the Company expects to better predict the amount of consideration to which it will be entitled. There are no constraints on the variable consideration recorded. The Company then allocates the transaction price to each performance obligation in the contract based on a relative stand-alone selling price charged separately to customers or using an expected cost-plus-margin method. The corresponding revenues are recognized when or as the related performance obligations are satisfied, which are noted above. The impact of variable consideration was immaterial during the three months ended March 31, 2018. Deferred Revenues The Company’s standard assurance warranty period is normally 12 to 24 months. The Company sells separately-priced service contracts and extended warranty contracts related to certain of its products, especially its laser products. The separately priced contracts generally range from 12 to 60 months. The Company normally receives payment at the inception of the contract and recognizes revenue over the term of the agreement in proportion to the costs expected to be incurred in satisfying the obligations under the contract. The Company has elected to use the practical expedient related to disclosing the remaining performance obligations as of March 31, 2018, as the majority have a duration of less than one year. A rollforward of the Company’s deferred revenue is as follows: Three Months Ended Beginning balance, January 1 (1) $ 14,448 Amount of deferred revenue recognized in income (4,757 ) Additions to deferred revenue 7,639 Ending balance, March 31 (2) $ 17,330 (1) Beginning deferred revenue as of January 1, 2018 includes $11,322 of current deferred revenue and $3,126 of long-term deferred revenue. (2) Ending deferred revenue as of March 31, 2018 includes $14,003 of current deferred revenue and $3,327 of long-term deferred revenue. Costs to Obtain and Fulfill a Contract Under ASC 606, the Company expenses sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within selling, general and administration expenses. The Company has elected to recognize the costs for freight and shipping when control over products has transferred to the customer as an expense in cost of sales. The Company monitors and tracks the amount of product returns and reduces revenue at the time of shipment for the estimated amount of future returns, based on historical experience. The Company makes estimates evaluating its allowance for doubtful accounts. The Company continuously monitors collections and payments from its customers and maintains a provision for estimated credit losses based upon its historical experience and any specific customer collection issues that it has identified. Disaggregation of Revenue The following table summarizes revenue from contracts with customers: Three Months Ended March 31, 2018 Vacuum & Light & Motion Total Net revenues: Products $ 304,336 $ 192,341 $ 496,677 Services 44,008 13,590 57,598 Total net revenues $ 348,344 $ 205,931 $ 554,275 Three Months Ended March 31, 2017 Vacuum & Light & Motion Total Net revenues: Products $ 241,455 $ 146,483 $ 387,938 Services 36,529 12,686 49,215 Total net revenues $ 277,984 $ 159,169 $ 437,153 Product revenue, excluding revenue from certain custom products, is recorded at a point in time, while the majority of the service revenue and revenue from certain custom products are recorded over time. The following table summarizes revenue from contracts with customers by major market: Three Months Ended March 31, 2018 Vacuum & Light & Motion Total Net revenues: Semiconductor $ 275,701 $ 37,813 $ 313,514 Advanced markets 72,643 168,118 240,761 Total net revenues $ 348,344 $ 205,931 $ 554,275 Three Months Ended March 31, 2017 Vacuum & Light & Motion Total Net revenues: Semiconductor $ 218,804 $ 29,700 $ 248,504 Advanced markets 59,180 129,469 188,649 Total net revenues $ 277,984 $ 159,169 $ 437,153 Refer to Note 17 in the financial statements for revenue by reportable segment, geography and groupings of similar products.

Investments

Investments	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	4) Investments The fair value of investments classified as short-term consists of the following: March 31, 2018 December 31, 2017 Available-for-sale investments: Time deposits and certificates of deposit $ 10,459 $ 9,757 Bankers’ acceptance drafts 2,179 5,330 Asset-backed securities 38,012 36,990 Commercial paper 16,010 13,750 Corporate obligations 78,767 77,821 Municipal bonds 2,618 1,970 U.S. treasury obligations 30,220 28,078 U.S. agency obligations 22,349 35,738 $ 200,614 $ 209,434 Investments classified as long-term consist of the following: March 31, 2018 December 31, 2017 Available-for-sale investments: Group insurance contracts $ 6,441 $ 6,255 Cost method investments: Minority interest in a private company 4,400 4,400 $ 10,841 $ 10,655 The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments: As of March 31, 2018: Cost Gross Gross Estimated Short-term investments: Available-for-sale investments: Time deposits and certificates of deposit $ 10,458 $ 1 $ — $ 10,459 Bankers’ acceptance drafts 2,179 — — 2,179 Asset-backed securities 38,056 13 (57 ) 38,012 Commercial paper 16,065 — (55 ) 16,010 Corporate obligations 78,778 38 (49 ) 78,767 Municipal bonds 2,620 — (2 ) 2,618 U.S. treasury obligations 30,196 24 — 30,220 U.S. agency obligations 22,343 6 — 22,349 $ 200,695 $ 82 $ (163 ) $ 200,614 As of March 31, 2018: Cost Gross Gross Estimated Long-term investments: Available-for-sale investments: Group insurance contracts $ 6,382 $ 59 $ — $ 6,441 As of December 31, 2017: Cost Gross Gross Estimated Short-term investments: Available-for-sale investments: Time deposits and certificates of deposit $ 9,756 $ 1 $ — $ 9,757 Bankers acceptance drafts 5,330 — — 5,330 Asset-backed securities 37,017 15 (42 ) 36,990 Commercial paper 13,810 — (60 ) 13,750 Corporate obligations 77,788 58 (25 ) 77,821 Municipal bonds 1,970 — — 1,970 U.S. treasury obligations 28,054 24 — 28,078 U.S. agency obligations 35,728 10 — 35,738 $ 209,453 $ 108 $ (127 ) $ 209,434 As of December 31, 2017: Cost Gross Gross Estimated Long-term investments: Available-for-sale investments: Group insurance contracts $ 6,006 $ 249 $ — $ 6,255 The tables above, which show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments as of March 31, 2018 and December 31, 2017, reflect the inclusion within short-term investments of investments with contractual maturities greater than one year from the date of purchase. Management has the ability, if necessary, to liquidate any of its investments in order to meet the Company’s liquidity needs in the next 12 months. Accordingly, those investments with contractual maturities greater than one year from the date of purchase are classified as short-term on the accompanying balance sheets. The Company reviews and evaluates its investments for any indication of possible impairment. Based on this review, the Company has determined that the unrealized losses related to these investments at March 31, 2018 and December 31, 2017, were temporary. Interest income is accrued as earned. Dividend income is recognized as income on the date the stock trades “ex-dividend.” The cost of marketable securities sold is determined by the specific identification method. Realized gains or losses are reflected in income and were not material for the three months ended March 31, 2018 and 2017.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	5) Fair Value Measurements In accordance with the provisions of fair value accounting, a fair value measurement assumes that the transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability and defines fair value based upon an exit price model. The fair value measurement guidance establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance describes three levels of inputs that may be used to measure fair value: Level 1 Quoted prices in active markets for identical assets or liabilities assessed as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments or securities or derivative contracts that are valued using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the Company categorizes such assets and liabilities based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Assets and liabilities of the Company are measured at fair value on a recurring basis as of March 31, 2018 and are summarized as follows: Fair Value Measurements at Reporting Date Description March 31, 2018 Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 1,075 $ 1,075 $ — $ — Commercial paper 18,385 — 18,385 — Corporate obligations 950 — 950 — Municipal bonds 1,335 — 1,335 — U.S. treasury obligations 12,953 — 12,953 — U.S. agency obligations 9,509 — 9,509 — Restricted cash — money market funds 118 118 — — Available-for-sale investments: Time deposits and certificates of deposit 10,459 — 10,459 — Bankers’ acceptance drafts 2,179 — 2,179 — Asset-backed securities 38,012 — 38,012 — Commercial paper 16,010 — 16,010 — Corporate obligations 78,767 — 78,767 — Municipal bonds 2,618 — 2,618 — U.S. treasury obligations 30,220 — 30,220 — U.S. agency obligations 22,349 — 22,349 — Group insurance contracts 6,441 — 6,441 — Derivatives — currency forward contracts 85 — 85 — Funds in investments and other assets: Israeli pension assets 15,031 — 15,031 — Derivatives — interest rate hedge —non-current 8,170 — 8,170 — Total assets $ 274,666 $ 1,193 $ 273,473 $ — Liabilities: Derivatives — currency forward contracts $ 8,273 $ — $ 8,273 $ — Reported as follows: Assets: Cash and cash equivalents (1) $ 44,207 $ 1,075 $ 43,132 $ — Restricted cash 118 118 — — Short-term investments 200,614 — 200,614 — Other current assets 85 — 85 — Total current assets $ 245,024 $ 1,193 $ 243,831 $ — Long-term investments (2) $ 6,441 $ — $ 6,441 $ — Other assets 23,201 — 23,201 — Total long-term assets $ 29,642 $ — $ 29,642 $ — Liabilities: Other current liabilities $ 8,273 $ — $ 8,273 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $294,903 and non-negotiable time deposits of $1,660 as of March 31, 2018. (2) The long-term investments presented in the table above do not include the Company’s minority interest investment in a private company, which is accounted for under the cost method. Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2017 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description December 31, Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 4,987 $ 4,987 $ — $ — Time deposits and certificates of deposit 2,100 — 2,100 — Commercial paper 30,475 — 30,475 — Restricted cash — money market funds 119 119 — — Available-for-sale investments: Time deposits and certificates of deposit 9,757 — 9,757 — Bankers acceptance drafts 5,330 — 5,330 — Asset-backed securities 36,990 — 36,990 — Commercial paper 13,750 — 13,750 — Corporate obligations 77,821 — 77,821 — Municipal bonds 1,970 — 1,970 — U.S. treasury obligations 28,078 — 28,078 — U.S. agency obligations 35,738 — 35,738 — Group insurance contracts 6,255 — 6,255 — Derivatives — currency forward contracts 168 — 168 — Funds in investments and other assets: Israeli pension assets 15,048 — 15,048 — Derivatives — interest rate hedge — non-current 6,179 — 6,179 — Total assets $ 274,765 $ 5,106 $ 269,659 $ — Liabilities: Derivatives — currency forward contracts $ 6,198 $ — $ 6,198 $ — Total liabilities $ 6,198 $ — $ 6,198 $ — Assets: Cash and cash equivalents (1) $ 37,562 $ 4,987 $ 32,575 $ — Restricted cash 119 119 — — Short-term investments 209,434 — 209,434 — Other current assets 168 — 168 — Total current assets $ 247,283 $ 5,106 $ 242,177 $ — Long-term investments (2) $ 6,255 $ — $ 6,255 $ — Other assets 21,227 — 21,227 — Total long-term assets $ 27,482 $ — $ 27,482 $ — Liabilities: Other current liabilities $ 6,198 $ — $ 6,198 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $292,808 and non-negotiable time deposits of $3,398 as of December 31, 2017. (2) The long-term investments presented in the table above do not include the Company’s minority interest investment in a private company, which is accounted for under the cost method. Money Market Funds Money market funds are cash and cash equivalents and are classified within Level 1 of the fair value hierarchy. Available-For-Sale Investments Available-for-sale investments consisted of time deposits and drafts, certificates of deposit, bankers acceptance drafts, asset-backed securities (which include auto loans, credit card receivables and equipment trust receivables), commercial paper, corporate obligations, municipal bonds, U.S. treasury obligations and U.S. agency obligations. The Company measures its debt and equity investments at fair value. The Company’s available-for-sale investments are classified within Level 2 of the fair value hierarchy. Israeli Pension Assets Israeli pension assets represent investments in mutual funds, government securities and other time deposits. These investments are set aside for the retirement benefit of the employees at the Company’s Israeli subsidiaries. These funds are classified within Level 2 of the fair value hierarchy. Derivatives As a result of the Company’s global operating activities, the Company is exposed to market risks from changes in foreign currency exchange rates and variable interest rates, which may adversely affect its operating results and financial position. When deemed appropriate, the Company minimizes its risks from foreign currency exchange rate and interest rate fluctuations through the use of derivative financial instruments. The principal market in which the Company executes its foreign currency contracts and interest rate swaps is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants usually are large commercial banks. The forward foreign currency exchange contracts and interest rate hedge are valued using broker quotations or market transactions and are classified within Level 2 of the fair value hierarchy.

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	6) Derivatives The Company enters into derivative instruments for risk management purposes only, including derivatives designated as hedging instruments and those utilized as economic hedges. The Company operates internationally and, in the normal course of business, is exposed to fluctuations in interest rates and foreign exchange rates. These fluctuations can increase the costs of financing, investing and operating the business. The Company has used derivative instruments, such as forward foreign currency exchange contracts, to manage certain foreign currency exposure, and interest rate swaps to manage interest rate exposure. By nature, all financial instruments involve market and credit risks. The Company enters into derivative instruments with major investment grade financial institutions, for which no collateral is required. The Company has policies to monitor the credit risk of these counterparties. While there can be no assurance, the Company does not anticipate any material non-performance by any of these counterparties. Interest Rate Swap Agreement On September 30, 2016, the Company entered into an interest rate swap agreement to fix the rate on approximately 50% of its then-outstanding balance under the Credit Agreement, as described further in Note 10. This hedge fixes the interest rate paid on the hedged debt at 1.198% per annum plus the applicable credit spread, which was 2.00% as of March 31, 2018, through September 30, 2020. The interest rate swap is recorded at fair value on the balance sheet and changes in the fair value are recognized in other comprehensive income (loss) (“OCI”). To the extent that this arrangement is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded currently in earnings in the period it occurs. The notional amount of this transaction was $305,000 and had a fair value of $8,170 at March 31, 2018. The notional amount of this transaction was $305,000 and had a fair value of $6,179 at December 31, 2017. Foreign Exchange Contracts The Company hedges a portion of its forecasted foreign currency-denominated intercompany sales of inventory, over a maximum period of eighteen months, using forward foreign exchange contracts accounted for as cash-flow hedges related to Japanese, South Korean, British, Euro and Taiwanese currencies. To the extent these derivatives are effective in off-setting the variability of the hedged cash flows, and otherwise meet the hedge accounting criteria, changes in the derivatives’ fair value are not included in current earnings but are included in OCI in stockholders’ equity. These changes in fair value will subsequently be reclassified into earnings, as applicable, when the forecasted transaction occurs. To the extent that a previously designated hedging transaction is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded currently in earnings in the period it occurs. The cash flows resulting from forward exchange contracts are classified in the consolidated statements of cash flows as part of cash flows from operating activities. The Company does not enter into derivative instruments for trading or speculative purposes. As of March 31, 2018 and December 31, 2017, the Company had outstanding forward foreign exchange contracts with gross notional values of $228,463 and $208,922, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of March 31, 2018 and December 31, 2017: March 31, 2018 Currency Hedged (Buy/Sell) Gross Notional Fair (1) U.S. Dollar/Japanese Yen $ 75,339 $ (3,212 ) U.S. Dollar/South Korean Won 85,680 (2,772 ) U.S. Dollar/Euro 33,186 (1,068 ) U.S. Dollar/U.K. Pound Sterling 13,807 (512 ) U.S. Dollar/Taiwan Dollar 20,451 (624 ) Total $ 228,463 $ (8,188 ) December 31, 2017 Currency Hedged (Buy/Sell) Gross Notional Fair (1) U.S. Dollar/Japanese Yen $ 70,175 $ (233 ) U.S. Dollar/South Korean Won 79,672 (3,799 ) U.S. Dollar/Euro 26,140 (1,047 ) U.S. Dollar/U.K. Pound Sterling 12,104 (337 ) U.S. Dollar/Taiwan Dollar 20,831 (614 ) Total $ 208,922 $ (6,030 ) (1) Represents the receivable (payable) amount included in the consolidated balance sheet. The following table provides a summary of the fair value amounts of the Company’s derivative instruments: Derivatives Designated as Hedging Instruments March 31, 2018 December 31, 2017 Derivative assets: Foreign exchange contracts (1) $ 85 $ 168 Foreign currency interest rate hedge (2) 8,170 6,179 Derivative liabilities: Foreign exchange contracts (1) (8,273 ) (6,198 ) Total net derivative (liability) asset designated as hedging instruments $ (18 ) $ 149 (1) The derivative asset of $85 and $168 as of March 31, 2018 and December 31, 2017, respectively, related to foreign exchange contracts are classified in other current assets in the consolidated balance sheet. The derivative liability of $(8,273) and $(6,198) as of March 31, 2018 and December 31, 2017 are classified in other current liabilities in the consolidated balance sheet. These foreign exchange contracts are subject to a master netting agreement with one financial institution. However, the Company has elected to record these contracts on a gross basis in the balance sheet. (2) The interest rate hedge assets of $8,170 and $6,179 as of March 31, 2018 and December 31, 2017, respectively, are classified in other assets in the consolidated balance sheet. The net amount of existing gains as of March 31, 2018 that the Company expects to reclassify from OCI into earnings within the next twelve months is immaterial. The following table provides a summary of the (losses) gains on derivatives designated as cash flow hedging instruments: Three Months Ended March 31, Derivatives Designated as Cash Flow Hedging Instruments 2018 2017 Forward exchange contracts: Net gain (loss) recognized in OCI (1) $ 66 $ (4,271 ) Net (loss) gain reclassified from accumulated OCI into income (2) $ (2,539 ) $ 452 (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 months ended March 31, 2018 and 2017. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial. The following table provides a summary of the losses on derivatives not designated as hedging instruments: Three Months Ended March 31, Derivatives Not Designated as Hedging Instruments 2018 2017 Forward exchange contracts: Net loss recognized in income (1) $ (1,253 ) $ (1,463 ) (1) The Company enters into foreign exchange contracts to hedge against changes in the balance sheet for certain subsidiaries to mitigate the risk associated with certain foreign currency transactions in the ordinary course of business. These derivatives are not designated as hedging instruments and gains or losses from these derivatives are recorded immediately in other (expense) income.

Inventories, net

Inventories, net	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventories, net	7) Inventories, net Inventories consist of the following: March 31, 2018 December 31, 2017 Raw materials $ 203,520 $ 191,351 Work-in-process 62,212 54,050 Finished goods 99,977 93,680 $ 365,709 $ 339,081

Dispositions

Dispositions	3 Months Ended
	Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	8) Dispositions Sale of Data Analytics Solutions In April 2017, the Company completed the sale of its Data Analytics Solutions business for total proceeds of $72,509, net of cash sold and recorded a gain of $74,856. This business, which had revenues in 2016 of $12,700 and was included in the Vacuum & Analysis segment, was no longer a part of the Company’s long-term strategic objectives. The business did not qualify as a discontinued operation as this sale did not represent a strategic shift in the Company’s business, nor did the sale have a major effect on the Company’s operations. Therefore, the results of operations for all periods are included in the Company’s income from operations. The assets and liabilities of this business have not been reclassified or segregated in the consolidated balance sheet or consolidated statements of cash flows as the amounts were immaterial.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	9) Goodwill and Intangible Assets Goodwill The Company’s methodology for allocating the purchase price relating to purchase acquisitions is determined through established and generally accepted valuation techniques. Goodwill is measured as the excess of the cost of the acquisition over the sum of the amounts assigned to tangible and identifiable intangible assets acquired less liabilities assumed. The Company assigns assets acquired (including goodwill) and liabilities assumed to one or more reporting units as of the date of acquisition. Typically acquisitions relate to a single reporting unit and thus do not require the allocation of goodwill to multiple reporting units. If the products obtained in an acquisition are assigned to multiple reporting units, the goodwill is distributed to the respective reporting units as part of the purchase price allocation process. Goodwill and purchased intangible assets with indefinite useful lives are not amortized, but are reviewed for impairment annually during the fourth quarter of each fiscal year and whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. The process of evaluating the potential impairment of goodwill and intangible assets requires significant judgment. The Company regularly monitors current business conditions and other factors including, but not limited to, adverse industry or economic trends, restructuring actions and lower projections of profitability that may impact future operating results. The changes in the carrying amount of goodwill and accumulated impairment (loss) during the three months ended March 31, 2018 and year ended December 31, 2017 were as follows: Three Months Ended March 31, 2018 Twelve Months Ended December 31, 2017 Gross Accumulated Net Gross Accumulated Net Beginning balance at January 1 $ 735,323 $ (144,276 ) $ 591,047 $ 727,999 $ (139,414 ) $ 588,585 Sale of business (1) — — — (3,115 ) — (3,115 ) Impairment loss (2) — — — — (4,862 ) (4,862 ) Foreign currency translation 2,447 — 2,447 10,439 — 10,439 Ending balance at March 31, 2018 and December 31, 2017 $ 737,770 $ (144,276 ) $ 593,494 $ 735,323 $ (144,276 ) $ 591,047 (1) In 2017, the Company sold its Data Analytics business and, as a result, charged the related goodwill of $(3,115) to the gain on sale of business. (2) In 2017, the Company recorded an impairment loss of $(4,862) related to the write-off of goodwill related to the discontinuation of a product line and consolidation of two manufacturing plants. Intangible Assets Components of the Company’s intangible assets are comprised of the following: As of March 31, 2018: Gross Impairment Accumulated Foreign Net Completed technology $ 172,431 $ (105 ) $ (120,898 ) $ 425 $ 51,853 Customer relationships 282,744 (1,406 ) (50,138 ) 2,682 233,882 Patents, trademarks, trade names and other 110,523 — (39,958 ) 45 70,610 $ 565,698 $ (1,511 ) $ (210,994 ) $ 3,152 $ 356,345 As of December 31, 2017: Gross Impairment (2) Accumulated Foreign Net Completed technology (1) $ 172,431 $ (105 ) $ (115,371 ) $ 333 $ 57,288 Customer relationships (1) 282,744 (1,406 ) (45,518 ) 1,571 237,391 Patents, trademarks, trade names and other (1) 110,523 — (38,730 ) (74 ) 71,719 $ 565,698 $ (1,511 ) $ (199,619 ) $ 1,830 $ 366,398 (1) In 2017, the Company sold its Data Analytics business and, as a result, wrote off the related intangibles of $4,155 of completed technology, $2,300 of customer relationships and $1,200 of patents, trademarks, trade names and other, which were fully amortized at the time of sale. (2) In 2017, the Company recorded impairment charges of $1,511 related to the write-off of intangible assets as a result of the discontinuation of a product line and consolidation of two manufacturing plants. Aggregate amortization expense related to acquired intangibles for the three months ended March 31, 2018 and 2017 was $11,190 and $12,501, respectively. The amortization expense for the three months ended March 31, 2018 and 2017, was net of $185 and $177, respectively, of amortization income from unfavorable lease commitments. Aggregate net amortization expense related to acquired intangible assets and unfavorable lease commitments for future years is as follows: Year Amount 2018 (remaining) $ 32,596 2019 40,511 2020 28,393 2021 20,485 2022 17,811 2023 17,427 Thereafter 140,413

Debt

Debt	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Debt	10) Debt Term Loan Credit Agreement In connection with the completion of the Company’s acquisition of Newport Corporation (“Newport”) in April 2016 (the “Newport Merger”), the Company entered into a term loan credit agreement (the “Credit Agreement”) with Barclays Bank PLC, as administrative agent and collateral agent, and the lenders from time to time party thereto (the “Lenders”), that provided senior secured financing of $780,000, subject to increase at the Company’s option in accordance with the Credit Agreement (the “Term Loan Facility”). Borrowings under the Term Loan Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, and (4) a floor of 1.75%, plus, in each case, an applicable margin; or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR rate floor of 0.75%, plus an applicable margin. The Company has elected the interest rate as described in clause (b). The Credit Agreement provides that all loans will be determined by reference to the Base Rate if the LIBOR rate cannot be ascertained, if regulators impose material restrictions on the authority of a lender to make LIBOR rate loans, or for other reasons. The Term Loan Facility was issued with original issue discount of 1.00% of the principal amount thereof. On June 9, 2016, the Company entered into Amendment No. 1 (the “Repricing Amendment 1”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 1 decreased the applicable margin for borrowings under the Company’s Term Loan Facility to 2.50% for base rate borrowings and 3.50% for LIBOR borrowings and extended the period during which a prepayment premium may be required for a “Repricing Transaction” (as defined in the Credit Agreement) until six months after the effective date of the Repricing Amendment 1. In connection with the execution of the Repricing Amendment 1, the Company paid a prepayment premium of 1.00%, or $7,300, as well as certain fees and expenses of the administrative agent and the Lenders, in accordance with the terms of the Credit Agreement. Immediately prior to the effectiveness of the Repricing Amendment 1, the Company prepaid $50,000 of principal under the Credit Agreement. In September 2016, the Company prepaid an additional $60,000 under the Credit Agreement. On September 30, 2016, the Company entered into an interest rate swap agreement, which has a maturity date of September 30, 2020, to fix the rate on $335,000 of the then-outstanding balance of the Credit Agreement. The rate is fixed at 1.198% per annum plus the applicable credit spread, which was 2.00% at March 31, 2018. The notional amount of this transaction was $305,000 and had a fair value of $8,170 at March 31, 2018. On December 14, 2016, the Company entered into Amendment No. 2 (the “Repricing Amendment 2”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 2 decreased the applicable margin for the Company’s term loan under the Credit Agreement to 2.75% for LIBOR borrowings and 1.75% for base rate borrowings and reset the period during which a prepayment premium may be required for a Repricing Transaction until six months after the effective date of the Repricing Amendment 2. In November 2016, prior to the effectiveness of the Repricing Amendment 2, the Company prepaid an additional $40,000 of principal under the Credit Agreement. In March 2017, the Company prepaid an additional $50,000 of principal under the Credit Agreement. On July 6, 2017, the Company entered into Amendment No. 3 (the “Repricing Amendment 3”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 3 decreased the applicable margin for the Company’s term loan under the Credit Agreement to 2.25% for LIBOR rate loans when the Total Leverage Ratio (as defined in the Credit Agreement) was at or above 1.25:1 and decreased to 2.00% when the Total Leverage Ratio was below 1.25:1, both with a LIBOR floor of 0.75%. The margin for base rate borrowings decreased to 1.25% when the Total Leverage Ratio is at or above 1.25:1 and to 1.00% when the Total Leverage Ratio is below 1.25:1. The period during which a prepayment premium may be required for a Repricing Transaction was reset to six months after the effective date of the Repricing Amendment 3. In July 2017, August 2017, November 2017 and March 2018 the Company prepaid $50,000, $75,000, $50,000 and $50,000, respectively, of principal under the Credit Agreement. As of March 31, 2018, after total prepayments of $425,000 and regularly scheduled principal payments of $6,536, the total outstanding principal balance was $348,464. The interest rate as of March 31, 2018 was 3.648%. On April 11, 2018, the Company entered into Amendment No. 4 (the “Repricing Amendment 4”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 4 decreased the applicable margin for the Company’s LIBOR rate term loan under the Credit Agreement to 1.75%, with a LIBOR floor of 0.75%. The margin for base rate borrowings decreased to 0.75% with a base rate floor of 1.75%. The period during which a prepayment premium may be required for a Repricing Transaction was reset to six months after the effective date of the Repricing Amendment 4. The Company incurred $28,747 of deferred finance fees, original issue discount and repricing fees related to the term loans under the Term Loan Facility, which is included in long-term debt in the accompanying consolidated balance sheets and are being amortized to interest expense over the estimated life of the term loans using the effective interest method. A portion of these fees has been accelerated in connection with the various debt prepayments during 2016, 2017 and 2018. As of March 31, 2018, the remaining balance of the deferred finance fees, original issue discount and repricing fee related to the Term Loan Facility was $7,226. Under the Credit Agreement, the Company is required to prepay outstanding term loans, subject to certain exceptions, with portions of its annual excess cash flow as well as with the net cash proceeds of certain asset sales, certain casualty and condemnation events and the incurrence or issuance of certain debt. The Company is also required to make scheduled quarterly payments each equal to 0.25% of the principal amount of the term loans outstanding, less the amount of certain voluntary and mandatory repayments after such date, with the balance due on the seventh anniversary of the closing date. As a result of making total prepayments of $425,000 through March 31, 2018, the Company is no longer required to make any scheduled principal payments until maturity date of the loan. All obligations under the Term Loan Facility are guaranteed by certain of the Company’s domestic subsidiaries, and are collateralized by substantially all of the Company’s assets and the assets of such subsidiaries, subject to certain exceptions and exclusions. The Credit Agreement contains customary representations and warranties, affirmative and negative covenants and provisions relating to events of default. If an event of default occurs, the Lenders under the Term Loan Facility will be entitled to take various actions, including the acceleration of amounts due under the Term Loan Facility and all actions generally permitted to be taken by a secured creditor. At March 31, 2018, the Company was in compliance with all covenants under the Credit Agreement. Senior Secured Asset-Based Revolving Credit Facility In connection with the completion of the Newport Merger, the Company also entered into an asset-based credit agreement with Deutsche Bank AG New York Branch, as administrative agent and collateral agent, the other borrowers from time to time party thereto, and the lenders and letters of credit issuers from time to time party thereto (the “ABL Facility”), that provides senior secured financing of up to $50,000, subject to a borrowing base limitation. The borrowing base for the ABL Facility at any time equals the sum of: (a) 85% of certain eligible accounts; plus (b) subject to certain notice and field examination and appraisal requirements, the lesser of (i) the lesser of (A) 65% of the lower of cost or market value of certain eligible inventory and (B) 85% of the net orderly liquidation value of certain eligible inventory and (ii) 30% of the borrowing base; minus (c) reserves established by the administrative agent; provided that until the administrative agent’s receipt of a field examination of accounts receivable the borrowing base shall be equal to 70% of the book value of certain eligible accounts. The ABL Facility includes borrowing capacity in the form of letters of credit up to $15,000. The Company has not drawn against the ABL Facility as of March 31, 2018. Borrowings under the ABL Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, and (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, plus, in each case, an initial applicable margin of 0.75%; and (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, plus an initial applicable margin of 1.75%. Commencing with the completion of the first fiscal quarter ending after the closing of the ABL Facility, the applicable margin for borrowings thereunder is subject to upward or downward adjustment each fiscal quarter, based on the average historical excess availability during the preceding quarter. The Company incurred $1,201 of costs in connection with the ABL Facility, which were capitalized and included in other assets in the accompanying consolidated balance sheets and are being amortized to interest expense using the straight-line method over the contractual term of five years of the ABL Facility. In addition to paying interest on outstanding principal under the ABL Facility, the Company is required to pay a commitment fee in respect of the unutilized commitments thereunder. The initial commitment fee is 0.375% per annum. The total commitment fee recognized in interest expense for the three months ended March 31, 2018, was $95. Commencing with the completion of the first fiscal quarter ending after the closing of the ABL Facility, the commitment fee is subject to downward adjustment based on the amount of average unutilized commitments for the three month period immediately preceding such adjustment date. The Company must also pay customary letter of credit fees and agency fees. Lines of Credit and Short-Term Borrowing Arrangements One of the Company’s Japanese subsidiaries has lines of credit and short-term borrowing arrangements with two financial institutions, which arrangements generally expire and are renewed at three month intervals. The lines of credit provided for aggregate borrowings as of March 31, 2018 of up to an equivalent of $21,641 U.S. dollars. One of the borrowing arrangements has an interest rate based on the Tokyo Interbank Offer Rate at the time of borrowing and the other has an interest rate based on the Japanese Short-Term Prime Lending Rate. Total borrowings outstanding under these arrangements were $941 at March 31, 2018. There were no borrowings outstanding under these arrangements at December 31, 2017. The Company assumed various revolving lines of credit and a financing facility with the completion of the Newport Merger. These revolving lines of credit and financing facility have no expiration date and provided for aggregate borrowings as of March 31, 2018 of up to an equivalent of $9,879 U.S. dollars. These lines of credit have a base interest rate of 1.25% plus a Japanese Yen overnight LIBOR rate. Total borrowings outstanding under these arrangements were $3,828 and $2,965 at March 31, 2018 and December 31, 2017. One of the Company’s Austrian subsidiaries has various outstanding loans from the Austrian government to fund research and development. These loans are unsecured and do not require principal repayment as long as certain conditions are met. Interest on these loans is payable semi-annually. The interest rates associated with these loans range from 0.75% to 2.00%. March 31, 2018 December 31, 2017 Short-term debt: Japanese lines of credit $ 3,915 $ 2,750 Japanese receivables financing facility 854 215 Austrian loans due through March 2019 681 — Other debt 6 7 $ 5,456 $ 2,972 March 31, 2018 December 31, 2017 Long-term debt: Austrian loans due through March 2020 $ 52 $ 714 Term Loan Facility, net (1) 341,238 389,279 $ 341,290 $ 389,993 (1) Net of deferred financing fees, original issuance discount and repricing fee of $7,226 and $9,185 as of March 31, 2018 and December 31, 2017, respectively. The Company recognized interest expense of $5,430 and $8,832 for the three months ended March 31, 2018 and 2017, respectively. Contractual maturities of the Company’s debt obligations as of March 31, 2018 are as follows: Year Amount 2018 (remaining) $ 4,788 2019 668 2020 52 2021 — 2022 — Thereafter 348,464

Product Warranties

Product Warranties	3 Months Ended
	Mar. 31, 2018
Guarantees and Product Warranties [Abstract]
Product Warranties	11) Product Warranties The Company records the estimated costs to fulfill customer warranty obligations upon the recognition of the related revenue. While the Company engages in extensive product quality programs and processes, including actively monitoring and evaluating the quality of its component suppliers, the Company’s warranty obligation is affected by shipment volume, product failure rates, utilization levels, material usage, and supplier warranties on parts delivered to the Company. Should actual product failure rates, utilization levels, material usage, or supplier warranties on parts differ from the Company’s estimates, revisions to the estimated warranty liability would be required. Product warranty activities were as follows: Three Months Ended March 31, 2018 2017 Beginning of period $ 10,104 $ 8,261 Provision for product warranties 5,184 3,014 Direct and other charges to warranty liability (4,073 ) (2,790 ) End of period (1) $ 11,215 $ 8,485 (1) Short-term product warranty of $10,856 and long-term product warranty of $359 as of March 31, 2018, are included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet. Short-term product warranty of $8,071 and long-term product warranty of $414 as of March 31, 2017, are included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	12) Income Taxes The Act was enacted on December 22, 2017. The Act reduces the U.S. federal corporate income tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and creates new taxes on certain foreign sourced earnings. The Company is applying SAB 118 when accounting for the enactment effects of the Act. As of March 31, 2018, the Company has not completed the accounting for all of the tax effects of the Act, however provisional estimates have been recorded. For the quarter ended March 31, 2018, the Company recognized a tax benefit of $790 related to the provisional estimates recorded for the Act and included these adjustments as a component of income tax expense from continuing operations. The calculations will continue to be refined and adjusted as additional analysis is completed and more guidance is issued. These future adjustments could be material to income tax expense. The global intangible low-taxed income (“GILTI”) provision from the Act subjects a U.S. shareholder to current tax on GILTI earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740 No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary differences expected to reverse as GILTI in future years or to recognize the resulting tax on GILTI as a period expense in the period the tax is incurred. The Company has elected to recognize the resulting tax on GILTI as a period expense in the period the tax is incurred and expects to incur tax for the year ended December 31, 2018. The reasonable estimate for this adjustment, net of foreign tax credits, increased the Company’s effective tax rate for 2018 by approximately 1.0%. The Company’s effective tax rate for the three months ended March 31, 2018 and 2017 was 17.1% and 15.8%, respectively. The effective tax rate for the three months ended March 31, 2018, and related income tax expense, was lower than the U.S. statutory tax rate mainly due to the geographic mix of income earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory tax rate, windfall benefits of stock compensation, and the new deduction for foreign derived intangible income from the Act offset by the tax effects of the new provision for global intangible low taxed income from the Act and state income taxes. The effective tax rate for the three months ended March 31, 2017 was lower than the U.S. statutory tax rate mainly due to the impact of lower tax rates on foreign income, the deduction for domestic production activities and windfall benefits of stock compensation. As of March 31, 2018 and December 31, 2017, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $27,938 and $27,345, respectively. As of March 31, 2018, if these benefits were recognized in a future period, the timing of which is not estimable, the net unrecognized tax benefit of $20,525, 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 March 31, 2018 and December 31, 2017, the Company had accrued interest on unrecognized tax benefits of approximately $532 and $327, respectively. Over the next 12 months it is reasonably possible that the Company may recognize approximately $1,047 of previously net unrecognized tax benefits, excluding interest and penalties, related to various U.S. federal, state and foreign tax positions primarily as a result of the expiration of certain statutes of limitations. The Company and its subsidiaries are subject to examination by U.S. federal, state and foreign tax authorities. The United States Internal Revenue Service commenced an examination of the Company’s U.S. federal income tax filings for tax years 2015 and 2016 during the quarter ended September 30, 2017. This audit was effectively settled during the quarter ended March 31, 2018, and the impact was not material. Also during the quarter, the Company received notification from the United States Internal Revenue Service that a new audit is scheduled to begin for its U.S. subsidiary, Newport Corporation, for tax year 2015. The U.S. statute of limitations remains open for tax years 2014 through present. The statute of limitations for the Company’s tax filings in other jurisdictions varies between fiscal years 2012 through present. We also have certain federal credit carry-forwards and state tax loss and credit carry-forwards that are open to examination for tax years 2000 through the present.

Pension Plans

Pension Plans	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Pension Plans	13) Pension Plans As a result of the acquisition of Newport, the Company has assumed all assets and liabilities of Newport’s defined benefit pension plans, which covers substantially all of its full-time employees in France, Germany, Israel and Japan. In addition, there are certain pension liabilities relating to former employees in the United Kingdom. The German plan is unfunded, as permitted under the plan and applicable laws. The net periodic benefit costs were immaterial for both the three month periods ended March 31, 2018 and 2017. The Company’s contributions to these plans for both the three month period ended March 31, 2018 and 2017, as required by local pension accounting laws, were immaterial.

Net Income Per Share

Net Income Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income Per Share	14) Net Income Per Share The following table sets forth the computation of basic and diluted net income per share: Three Months Ended March 31, 2018 2017 Numerator: Net income $ 105,121 $ 65,060 Denominator: Shares used in net income per common share — basic 54,423,000 53,769,000 Effect of dilutive securities: Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 863,000 1,189,000 Shares used in net income per common share — diluted 55,286,000 54,958,000 Net income per common share: Basic $ 1.93 $ 1.21 Diluted $ 1.90 $ 1.18 Basic earnings per share (“EPS”) is computed by dividing income available to common stockholders by the weighted-average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding (using the treasury stock method) if securities containing potentially dilutive common shares (restricted stock units and stock appreciation rights) had been converted to such common shares, and if such assumed conversion is dilutive. For the three months ended March 31, 2018, there were approximately 380 weighted-average restricted stock units and no weighted-average stock appreciation rights, that would have had an anti-dilutive effect on EPS, and would thus need to be excluded from the computation of diluted weighted-average shares. For the three months ended March 31, 2017, there were no weighted-average shares of restricted stock units or stock appreciation rights that would have had an anti-dilutive effect on EPS, and would thus need to be excluded from the computation of diluted weighted-average shares.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Stockholders' Equity	15) Stockholders’ Equity Share Repurchase Program On July 25, 2011, the Company’s Board of Directors approved a share repurchase program for the repurchase of up to an aggregate of $200,000 of its outstanding common stock from time to time in open market purchases, privately negotiated transactions or through other appropriate means. The timing and quantity of any shares repurchased will depend upon a variety of factors, including business conditions, stock market conditions and business development activities, including, but not limited to, merger and acquisition opportunities. These repurchases may be commenced, suspended or discontinued at any time without prior notice. The Company has repurchased approximately 1,770,000 shares of common stock for approximately $52,000 pursuant to the program since its adoption. During the three months ended March 31, 2018 and 2017, there were no repurchases of common stock. Cash Dividends Holders of the Company’s common stock are entitled to receive dividends when and if they are declared by the Company’s board of directors. During the three months ended March 31, 2018, we paid cash dividends of $9,808 in the aggregate or $0.18 per share. During the three months ended March 31, 2017, we paid cash dividends of $9,419 in the aggregate or $0.175 per share. Future dividend declarations, if any, as well as the record and payment dates for such dividends, are subject to the final determination of the Company’s Board of Directors. In addition, under the terms of the Company’s senior secured Term Loan Facility and its senior secured asset-based revolving credit facility, the Company may be restricted from paying dividends under certain circumstances.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	16) Stock-Based Compensation The Company has granted Restricted Stock Units (“RSUs”) to employees and directors under the 2014 Stock Incentive Plan (the “2014 Plan”). The 2014 Plan is administered by the Compensation Committee of the Company’s Board of Directors. The 2014 Plan is intended to attract and retain employees and directors, and to provide an incentive for these individuals to assist the Company to achieve long-range performance goals and to enable these individuals to participate in the long-term growth of the Company. In connection with the completion of the Newport Merger, the Company assumed: ● all RSUs granted under any Newport equity plan that were outstanding immediately prior to the effective time of the Newport Merger, and as to which shares of Newport common stock were not fully distributed in connection with the closing of the Newport Merger, and ● all stock appreciation rights (“SARs”) granted under any Newport equity plan, whether vested or unvested, that were outstanding immediately prior to the effective time of the Newport Merger. During the three months ended March 31, 2018, the Company granted 122,831 RSUs with a weighted average grant date fair value of $109.62. During the three months ended March 31, 2017, the Company granted 171,179 RSUs with a weighted average grant date fair value of $66.06. There were no SARs granted during the three months ended March 31, 2018 or 2017. The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows: Three Months Ended Three Months Ended Cost of revenue $ 1,005 $ 930 Research and development expense 722 745 Selling, general and administrative expense 8,699 7,107 Total pre-tax stock-based compensation expense $ 10,426 $ 8,782 At March 31, 2018, the total compensation expense related to unvested stock-based awards granted to employees, officers and directors under the 2014 Plan that had not been recognized was $22,844, net of estimated forfeitures. The future compensation expense is recognized on a straight-line basis over the requisite service period, net of estimated forfeitures except for retirement eligible employees in which the Company expenses the fair value of the grant in the period the grant is issued. The Company considers many factors when estimating expected forfeitures, including types of awards and historical experience. Actual results and future changes in estimates may differ substantially from the Company’s current estimates. The following table presents the activity for RSUs under the Plan: Three Months Ended March 31, 2018 Outstanding RSUs Weighted Average RSUs — beginning of period 943,379 $ 47.57 Accrued dividend shares 18 124.85 Granted 122,831 109.62 Vested (204,290 ) 40.96 Forfeited (23,740 ) 61.63 RSUs — end of period 838,198 $ 57.88 The following table presents the activity for SARs under the Plan: Three Months Ended March 31, 2018 Outstanding SARs Weighted Average SARs — beginning of period 282,907 $ 28.62 Exercised (17,775 ) 27.90 Forfeited or expired (773 ) 31.13 SARs Outstanding — end of period 264,359 $ 28.66

Business Segment, Geographic Ar

Business Segment, Geographic Area, Product and Significant Customer Information	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Business Segment, Geographic Area, Product and Significant Customer Information	17) Business Segment, Geographic Area, Product and Significant Customer Information The Company is a global provider of instruments, subsystems and process control solutions that measure, monitor, deliver, analyze, power and control critical parameters of advanced manufacturing processes to improve process performance and productivity. The Company’s products are derived from its core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, residual gas analysis, leak detection, control technology, ozone generation and delivery, RF & DC power, reactive gas generation, vacuum technology, lasers, photonics, sub-micron positioning, vibration control, and optics. The Company also provides services related to the maintenance and repair of its products, installation services and training. The Company’s Chief Operating Decision Maker (“CODM”) utilizes financial information to make decisions about allocating resources and assessing performance for the entire Company, which is used in the decision making process to assess performance. Based upon the information provided to the CODM, the Company has determined it has two reportable segments. The Company’s two reportable segments are: Vacuum & Analysis and Light & Motion. The Vacuum & Analysis segment provides a broad range of instruments, components and subsystems which are derived from the Company’s core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, residual gas analysis, leak detection, control technology, ozone generation and delivery, RF & DC power, reactive gas generation and vacuum technology. The Light & Motion segment provides a broad range of instruments, components and subsystems which are derived from the Company’s core competencies in lasers, photonics, sub-micron positioning, vibration control, and optics. The Company derives its segment results directly from the manner in which results are reported in its management reporting system. The accounting policies that the Company uses to derive reportable segment results are substantially the same as those used for external reporting purposes. The Company does not disclose external or intersegment revenues separately by reportable segment as this information is not presented to the CODM for decision making purposes. The following are net revenues by reportable segment: Three Months Ended March 31, 2018 2017 Vacuum & Analysis $ 348,344 $ 277,984 Light & Motion 205,931 159,169 $ 554,275 $ 437,153 The following is a reconciliation of segment gross profit to consolidated net income: Three Months Ended March 31, 2018 2017 Gross profit by reportable segment: Vacuum & Analysis $ 158,500 $ 128,924 Light & Motion 104,355 76,623 Total gross profit by reportable segment 262,855 205,547 Operating expenses: Research and development 34,857 33,282 Selling, general and administrative 82,949 74,220 Acquisition and integration costs — 1,442 Restructuring 1,220 522 Environmental costs 1,000 — Amortization of intangible assets 11,190 12,501 Income from operations 131,639 83,580 Interest and other expense, net (4,897 ) (6,295 ) Income before income taxes 126,742 77,285 Provision for income taxes 21,621 12,225 Net income $ 105,121 $ 65,060 The following are capital expenditures by reportable segment for the three months ended March 31, 2018 and 2017: Vacuum & Analysis Light & Motion Total Three Months Ended March 31, 2018: Capital expenditures $ 6,197 $ 3,193 $ 9,390 Three Months Ended March 31, 2017: Capital expenditures $ 2,374 $ 1,725 $ 4,099 The following are depreciation and amortization of intangible assets by reportable segment for the three months ended March 31, 2018 and 2017: Vacuum & Analysis Light & Motion Total Three Months Ended March 31, 2018: Depreciation and amortization $ 5,129 $ 15,363 $ 20,492 Three Months Ended March 31, 2017: Depreciation and amortization $ 5,122 $ 16,711 $ 21,833 Total income tax expense is not presented by reportable segment because the necessary information is not available or used by the CODM. The following are segment assets by reportable segment: March 31, 2018: Vacuum & Analysis Light & Motion Corporate, Total Segment assets: Accounts receivable $ 225,822 $ 131,677 $ (15,781 ) $ 341,718 Inventory, net 216,237 149,472 — 365,709 Total segment assets $ 442,059 $ 281,149 $ (15,781 ) $ 707,427 December 31, 2017: Vacuum & Analysis Light & Motion Corporate, Total Segment assets: Accounts receivable $ 201,318 $ 119,934 $ (20,944 ) $ 300,308 Inventory, net 197,831 141,250 — 339,081 Total segment assets $ 399,149 $ 261,184 $ (20,944 ) $ 639,389 A reconciliation of segment assets to consolidated total assets is as follows: March 31, 2018 December 31, 2017 Total segment assets $ 707,427 $ 639,389 Cash and cash equivalents, restricted cash and investments 552,343 553,976 Other current assets 59,093 53,543 Property, plant and equipment, net 172,802 171,782 Goodwill and intangible assets, net 949,839 957,445 Other assets 39,952 37,883 Consolidated total assets $ 2,481,456 $ 2,414,018 Geographic Information about the Company’s operations in different geographic regions is presented in the tables below. Net revenues to unaffiliated customers are based on the location in which the sale originated. Transfers between geographic areas are at negotiated transfer prices and have been eliminated from consolidated net revenues. Three Months Ended March 31, 2018 2017 Net revenues: United States $ 276,720 $ 218,050 Korea 54,011 44,878 Japan 58,274 37,792 Asia (excluding Korea and Japan) 101,384 88,243 Europe 63,886 48,190 $ 554,275 $ 437,153 March 31, 2018 December 31, 2017 Long-lived assets: (1) United States $ 127,637 $ 124,689 Europe 28,787 28,820 Asia 49,566 49,645 $ 205,990 $ 203,154 (1) Long-lived assets include property, plant and equipment, net and certain other long-term assets, excluding long-term tax related accounts. Goodwill associated with each of the Company’s reportable segments is as follows: March 31, 2018 December 31, 2017 Reportable segment: Vacuum & Analysis $ 197,689 $ 197,617 Light & Motion 395,805 393,430 Total goodwill $ 593,494 $ 591,047 Worldwide Product Information Because the reportable segment information above does not reflect worldwide sales of the Company’s products, the Company groups its products into six groups of similar products based upon the similarity of product function. The following table sets forth worldwide net revenue for each group of products: Three Months Ended March 31, 2018 2017 Analytical and Control Solutions Products $ 33,712 $ 31,820 Power, Plasma and Reactive Gas Solutions Products 167,052 122,800 Vacuum Solutions Products 147,580 123,364 Lasers Products 74,797 44,944 Optics Products 54,379 46,505 Photonics Products 76,755 67,720 $ 554,275 $ 437,153 Sales of Analytical and Control Solutions Products; Power, Plasma and Reactive Gas Solutions Products; and Vacuum Solutions Products are included in the Company’s Vacuum & Analysis segment. Sales of Laser Products; Optics Products; and Photonics Products are included in the Light & Motion segment. Major Customers The Company had two customers with net revenues greater than 10% of total net revenues in the periods shown below: Three Months Ended March 31, 2018 2017 LAM Research Corporation. 12.6 % 12.6 % Applied Materials, Inc. 12.2 % 13.0 %

Restructuring

Restructuring	3 Months Ended
	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Restructuring	18) Restructuring During the three months ended March 31, 2018 and 2017, the Company recorded restructuring charges of $1,220 and $522, respectively. The restructuring charges for the three months ended March 31, 2018 primarily related to severance costs related to streamlining and consolidating certain administrative functions. The restructuring charges for the three months ended March 31, 2017 relate to the restructuring of one of the Company’s international facilities and the consolidation of certain sales offices. Restructuring activities were as follows: Three Months Ended March 31, 2018 2017 Beginning of period $ 3,244 $ 540 Charged to expense 1,220 522 Payments and adjustments (1,806 ) (347 ) End of period $ 2,658 $ 715

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	19) Commitments and Contingencies On March 9, 2016, a putative class action lawsuit captioned Dixon Chung v. Newport Corp., et al., Hubert C. Pincon v. Newport Corp., et al. On October 19, 2016, plaintiffs filed an amended complaint captioned In re Newport Corporation Shareholder Litigation On July 27, 2017, plaintiffs filed a second amended complaint, which names as defendants certain former directors of Newport. On August 8, 2017, the Court dismissed the Company and Newport from the action pursuant to stipulations among the parties. The second amended complaint alleges that the directors breached their fiduciary duties to Newport’s stockholders by agreeing to sell Newport through an inadequate and unfair process, which led to inadequate and unfair consideration, and by omitting material information from the proxy statement. The second amended complaint seeks monetary damages, including pre- and post-judgment interest. On September 1, 2017 the Newport directors filed a motion to dismiss the second amended complaint, which plaintiffs opposed. The Court held a hearing on the motion to dismiss on December 7, 2017. On January 5, 2018, the Court entered an order denying the motion to dismiss. The Newport directors answered the second amended complaint, denying the material allegations of the complaint and asserting defenses, on February 20, 2018. On April 13, 2018, the Company received a third-party subpoena duces tecum The Company is subject to various legal proceedings and claims, which have arisen in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a material adverse effect on the Company’s results of operations, financial condition or cash flows.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revised Presentation of Previously Issued Financial Statements	The Company has historically recorded the revenue and related cost of revenue for the sale of its spare parts within Products in its Statements of Operations for the Vacuum & Analysis segment. The Company has now determined that these items are better presented within revenue and related cost of revenue in Services in its Statements of Operations to align with the current manner in which the Company operates its services business, and has elected to reclassify these amounts in previously issued financial statements as shown below. This change in presentation has no impact on total revenue or total cost of revenue. Three Months Ended March 31, 2017 As previously Adjustment As re- Net revenues: Products $ 392,922 (4,984 ) $ 387,938 Services 44,231 4,984 49,215 Total net revenues 437,153 — 437,153 Cost of revenues: Cost of products 205,060 774 205,834 Cost of services 26,546 (774 ) 25,772 Total cost of revenues 231,606 — 231,606

Revenue from Contracts with C28

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2018
Schedule of Deferred Revenue by Arrangement	A rollforward of the Company’s deferred revenue is as follows: Three Months Ended Beginning balance, January 1 (1) $ 14,448 Amount of deferred revenue recognized in income (4,757 ) Additions to deferred revenue 7,639 Ending balance, March 31 (2) $ 17,330 (1) Beginning deferred revenue as of January 1, 2018 includes $11,322 of current deferred revenue and $3,126 of long-term deferred revenue. (2) Ending deferred revenue as of March 31, 2018 includes $14,003 of current deferred revenue and $3,327 of long-term deferred revenue.
Summary of Revenue from Contracts with Customers	The following table summarizes revenue from contracts with customers: Three Months Ended March 31, 2018 Vacuum & Light & Motion Total Net revenues: Products $ 304,336 $ 192,341 $ 496,677 Services 44,008 13,590 57,598 Total net revenues $ 348,344 $ 205,931 $ 554,275 Three Months Ended March 31, 2017 Vacuum & Light & Motion Total Net revenues: Products $ 241,455 $ 146,483 $ 387,938 Services 36,529 12,686 49,215 Total net revenues $ 277,984 $ 159,169 $ 437,153
Market Segment [Member]
Summary of Revenue from Contracts with Customers	The following table summarizes revenue from contracts with customers by major market: Three Months Ended March 31, 2018 Vacuum & Light & Motion Total Net revenues: Semiconductor $ 275,701 $ 37,813 $ 313,514 Advanced markets 72,643 168,118 240,761 Total net revenues $ 348,344 $ 205,931 $ 554,275 Three Months Ended March 31, 2017 Vacuum & Light & Motion Total Net revenues: Semiconductor $ 218,804 $ 29,700 $ 248,504 Advanced markets 59,180 129,469 188,649 Total net revenues $ 277,984 $ 159,169 $ 437,153

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Short-Term and Long-Term Investments Available-for-Sale and Cost Method Investments	The fair value of investments classified as short-term consists of the following: March 31, 2018 December 31, 2017 Available-for-sale investments: Time deposits and certificates of deposit $ 10,459 $ 9,757 Bankers’ acceptance drafts 2,179 5,330 Asset-backed securities 38,012 36,990 Commercial paper 16,010 13,750 Corporate obligations 78,767 77,821 Municipal bonds 2,618 1,970 U.S. treasury obligations 30,220 28,078 U.S. agency obligations 22,349 35,738 $ 200,614 $ 209,434 Investments classified as long-term consist of the following: March 31, 2018 December 31, 2017 Available-for-sale investments: Group insurance contracts $ 6,441 $ 6,255 Cost method investments: Minority interest in a private company 4,400 4,400 $ 10,841 $ 10,655
Gross Unrealized Gains and (Losses) Aggregated by Investment Category	The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments: As of March 31, 2018: Cost Gross Gross Estimated Short-term investments: Available-for-sale investments: Time deposits and certificates of deposit $ 10,458 $ 1 $ — $ 10,459 Bankers’ acceptance drafts 2,179 — — 2,179 Asset-backed securities 38,056 13 (57 ) 38,012 Commercial paper 16,065 — (55 ) 16,010 Corporate obligations 78,778 38 (49 ) 78,767 Municipal bonds 2,620 — (2 ) 2,618 U.S. treasury obligations 30,196 24 — 30,220 U.S. agency obligations 22,343 6 — 22,349 $ 200,695 $ 82 $ (163 ) $ 200,614 As of March 31, 2018: Cost Gross Gross Estimated Long-term investments: Available-for-sale investments: Group insurance contracts $ 6,382 $ 59 $ — $ 6,441 As of December 31, 2017: Cost Gross Gross Estimated Short-term investments: Available-for-sale investments: Time deposits and certificates of deposit $ 9,756 $ 1 $ — $ 9,757 Bankers acceptance drafts 5,330 — — 5,330 Asset-backed securities 37,017 15 (42 ) 36,990 Commercial paper 13,810 — (60 ) 13,750 Corporate obligations 77,788 58 (25 ) 77,821 Municipal bonds 1,970 — — 1,970 U.S. treasury obligations 28,054 24 — 28,078 U.S. agency obligations 35,728 10 — 35,738 $ 209,453 $ 108 $ (127 ) $ 209,434 As of December 31, 2017: Cost Gross Gross Estimated Long-term investments: Available-for-sale investments: Group insurance contracts $ 6,006 $ 249 $ — $ 6,255

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis	Assets and liabilities of the Company are measured at fair value on a recurring basis as of March 31, 2018 and are summarized as follows: Fair Value Measurements at Reporting Date Description March 31, 2018 Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 1,075 $ 1,075 $ — $ — Commercial paper 18,385 — 18,385 — Corporate obligations 950 — 950 — Municipal bonds 1,335 — 1,335 — U.S. treasury obligations 12,953 — 12,953 — U.S. agency obligations 9,509 — 9,509 — Restricted cash — money market funds 118 118 — — Available-for-sale investments: Time deposits and certificates of deposit 10,459 — 10,459 — Bankers’ acceptance drafts 2,179 — 2,179 — Asset-backed securities 38,012 — 38,012 — Commercial paper 16,010 — 16,010 — Corporate obligations 78,767 — 78,767 — Municipal bonds 2,618 — 2,618 — U.S. treasury obligations 30,220 — 30,220 — U.S. agency obligations 22,349 — 22,349 — Group insurance contracts 6,441 — 6,441 — Derivatives — currency forward contracts 85 — 85 — Funds in investments and other assets: Israeli pension assets 15,031 — 15,031 — Derivatives — interest rate hedge —non-current 8,170 — 8,170 — Total assets $ 274,666 $ 1,193 $ 273,473 $ — Liabilities: Derivatives — currency forward contracts $ 8,273 $ — $ 8,273 $ — Reported as follows: Assets: Cash and cash equivalents (1) $ 44,207 $ 1,075 $ 43,132 $ — Restricted cash 118 118 — — Short-term investments 200,614 — 200,614 — Other current assets 85 — 85 — Total current assets $ 245,024 $ 1,193 $ 243,831 $ — Long-term investments (2) $ 6,441 $ — $ 6,441 $ — Other assets 23,201 — 23,201 — Total long-term assets $ 29,642 $ — $ 29,642 $ — Liabilities: Other current liabilities $ 8,273 $ — $ 8,273 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $294,903 and non-negotiable time deposits of $1,660 as of March 31, 2018. (2) The long-term investments presented in the table above do not include the Company’s minority interest investment in a private company, which is accounted for under the cost method. Assets and liabilities of the Company are measured at fair value on a recurring basis as of December 31, 2017 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description December 31, Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 4,987 $ 4,987 $ — $ — Time deposits and certificates of deposit 2,100 — 2,100 — Commercial paper 30,475 — 30,475 — Restricted cash — money market funds 119 119 — — Available-for-sale investments: Time deposits and certificates of deposit 9,757 — 9,757 — Bankers acceptance drafts 5,330 — 5,330 — Asset-backed securities 36,990 — 36,990 — Commercial paper 13,750 — 13,750 — Corporate obligations 77,821 — 77,821 — Municipal bonds 1,970 — 1,970 — U.S. treasury obligations 28,078 — 28,078 — U.S. agency obligations 35,738 — 35,738 — Group insurance contracts 6,255 — 6,255 — Derivatives — currency forward contracts 168 — 168 — Funds in investments and other assets: Israeli pension assets 15,048 — 15,048 — Derivatives — interest rate hedge — non-current 6,179 — 6,179 — Total assets $ 274,765 $ 5,106 $ 269,659 $ — Liabilities: Derivatives — currency forward contracts $ 6,198 $ — $ 6,198 $ — Total liabilities $ 6,198 $ — $ 6,198 $ — Assets: Cash and cash equivalents (1) $ 37,562 $ 4,987 $ 32,575 $ — Restricted cash 119 119 — — Short-term investments 209,434 — 209,434 — Other current assets 168 — 168 — Total current assets $ 247,283 $ 5,106 $ 242,177 $ — Long-term investments (2) $ 6,255 $ — $ 6,255 $ — Other assets 21,227 — 21,227 — Total long-term assets $ 27,482 $ — $ 27,482 $ — Liabilities: Other current liabilities $ 6,198 $ — $ 6,198 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $292,808 and non-negotiable time deposits of $3,398 as of December 31, 2017. (2) The long-term investments presented in the table above do not include the Company’s minority interest investment in a private company, which is accounted for under the cost method.

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Primary Net Hedging Positions and Corresponding Fair Values	The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of March 31, 2018 and December 31, 2017: March 31, 2018 Currency Hedged (Buy/Sell) Gross Notional Fair (1) U.S. Dollar/Japanese Yen $ 75,339 $ (3,212 ) U.S. Dollar/South Korean Won 85,680 (2,772 ) U.S. Dollar/Euro 33,186 (1,068 ) U.S. Dollar/U.K. Pound Sterling 13,807 (512 ) U.S. Dollar/Taiwan Dollar 20,451 (624 ) Total $ 228,463 $ (8,188 ) December 31, 2017 Currency Hedged (Buy/Sell) Gross Notional Fair (1) U.S. Dollar/Japanese Yen $ 70,175 $ (233 ) U.S. Dollar/South Korean Won 79,672 (3,799 ) U.S. Dollar/Euro 26,140 (1,047 ) U.S. Dollar/U.K. Pound Sterling 12,104 (337 ) U.S. Dollar/Taiwan Dollar 20,831 (614 ) Total $ 208,922 $ (6,030 ) (1) Represents the receivable (payable) amount included in the consolidated balance sheet.
Summary of Fair Value Amounts of Company's Derivative Instruments	The following table provides a summary of the fair value amounts of the Company’s derivative instruments: Derivatives Designated as Hedging Instruments March 31, 2018 December 31, 2017 Derivative assets: Foreign exchange contracts (1) $ 85 $ 168 Foreign currency interest rate hedge (2) 8,170 6,179 Derivative liabilities: Foreign exchange contracts (1) (8,273 ) (6,198 ) Total net derivative (liability) asset designated as hedging instruments $ (18 ) $ 149 (1) The derivative asset of $85 and $168 as of March 31, 2018 and December 31, 2017, respectively, related to foreign exchange contracts are classified in other current assets in the consolidated balance sheet. The derivative liability of $(8,273) and $(6,198) as of March 31, 2018 and December 31, 2017 are classified in other current liabilities in the consolidated balance sheet. These foreign exchange contracts are subject to a master netting agreement with one financial institution. However, the Company has elected to record these contracts on a gross basis in the balance sheet. (2) The interest rate hedge assets of $8,170 and $6,179 as of March 31, 2018 and December 31, 2017, respectively, are classified in other assets in the consolidated balance sheet.
Summary of (Losses) Gains on Derivatives Designated as Cash Flow Hedging Instruments	The following table provides a summary of the (losses) gains on derivatives designated as cash flow hedging instruments: Three Months Ended March 31, Derivatives Designated as Cash Flow Hedging Instruments 2018 2017 Forward exchange contracts: Net gain (loss) recognized in OCI (1) $ 66 $ (4,271 ) Net (loss) gain reclassified from accumulated OCI into income (2) $ (2,539 ) $ 452 (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 months ended March 31, 2018 and 2017. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial.
Summary of Losses on Derivatives Not Designated as Cash Flow Hedging Instruments	The following table provides a summary of the losses on derivatives not designated as hedging instruments: Three Months Ended March 31, Derivatives Not Designated as Hedging Instruments 2018 2017 Forward exchange contracts: Net loss recognized in income (1) $ (1,253 ) $ (1,463 ) (1) The Company enters into foreign exchange contracts to hedge against changes in the balance sheet for certain subsidiaries to mitigate the risk associated with certain foreign currency transactions in the ordinary course of business. These derivatives are not designated as hedging instruments and gains or losses from these derivatives are recorded immediately in other (expense) income.

Inventories, net (Tables)

Inventories, net (Tables)	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consist of the following: March 31, 2018 December 31, 2017 Raw materials $ 203,520 $ 191,351 Work-in-process 62,212 54,050 Finished goods 99,977 93,680 $ 365,709 $ 339,081

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	The changes in the carrying amount of goodwill and accumulated impairment (loss) during the three months ended March 31, 2018 and year ended December 31, 2017 were as follows: Three Months Ended March 31, 2018 Twelve Months Ended December 31, 2017 Gross Accumulated Net Gross Accumulated Net Beginning balance at January 1 $ 735,323 $ (144,276 ) $ 591,047 $ 727,999 $ (139,414 ) $ 588,585 Sale of business (1) — — — (3,115 ) — (3,115 ) Impairment loss (2) — — — — (4,862 ) (4,862 ) Foreign currency translation 2,447 — 2,447 10,439 — 10,439 Ending balance at March 31, 2018 and December 31, 2017 $ 737,770 $ (144,276 ) $ 593,494 $ 735,323 $ (144,276 ) $ 591,047 (1) In 2017, the Company sold its Data Analytics business and, as a result, charged the related goodwill of $(3,115) to the gain on sale of business. (2) In 2017, the Company recorded an impairment loss of $(4,862) related to the write-off of goodwill related to the discontinuation of a product line and consolidation of two manufacturing plants.
Intangible Assets	Components of the Company’s intangible assets are comprised of the following: As of March 31, 2018: Gross Impairment Accumulated Foreign Net Completed technology $ 172,431 $ (105 ) $ (120,898 ) $ 425 $ 51,853 Customer relationships 282,744 (1,406 ) (50,138 ) 2,682 233,882 Patents, trademarks, trade names and other 110,523 — (39,958 ) 45 70,610 $ 565,698 $ (1,511 ) $ (210,994 ) $ 3,152 $ 356,345 As of December 31, 2017: Gross Impairment (2) Accumulated Foreign Net Completed technology (1) $ 172,431 $ (105 ) $ (115,371 ) $ 333 $ 57,288 Customer relationships (1) 282,744 (1,406 ) (45,518 ) 1,571 237,391 Patents, trademarks, trade names and other (1) 110,523 — (38,730 ) (74 ) 71,719 $ 565,698 $ (1,511 ) $ (199,619 ) $ 1,830 $ 366,398 (1) In 2017, the Company sold its Data Analytics business and, as a result, wrote off the related intangibles of $4,155 of completed technology, $2,300 of customer relationships and $1,200 of patents, trademarks, trade names and other, which were fully amortized at the time of sale. (2) In 2017, the Company recorded impairment charges of $1,511 related to the write-off of intangible assets as a result of the discontinuation of a product line and consolidation of two manufacturing plants.
Estimated Net Amortization Expense	Aggregate net amortization expense related to acquired intangible assets and unfavorable lease commitments for future years is as follows: Year Amount 2018 (remaining) $ 32,596 2019 40,511 2020 28,393 2021 20,485 2022 17,811 2023 17,427 Thereafter 140,413

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Schedule of Short-Term Debt	March 31, 2018 December 31, 2017 Short-term debt: Japanese lines of credit $ 3,915 $ 2,750 Japanese receivables financing facility 854 215 Austrian loans due through March 2019 681 — Other debt 6 7 $ 5,456 $ 2,972
Schedule of Long-Term Debt	March 31, 2018 December 31, 2017 Long-term debt: Austrian loans due through March 2020 $ 52 $ 714 Term Loan Facility, net (1) 341,238 389,279 $ 341,290 $ 389,993 (1) Net of deferred financing fees, original issuance discount and repricing fee of $7,226 and $9,185 as of March 31, 2018 and December 31, 2017, respectively.
Schedule of Contractual Maturities of Debt Obligations	Contractual maturities of the Company’s debt obligations as of March 31, 2018 are as follows: Year Amount 2018 (remaining) $ 4,788 2019 668 2020 52 2021 — 2022 — Thereafter 348,464

Product Warranties (Tables)

Product Warranties (Tables)	3 Months Ended
	Mar. 31, 2018
Guarantees and Product Warranties [Abstract]
Product Warranty Activities	Product warranty activities were as follows: Three Months Ended March 31, 2018 2017 Beginning of period $ 10,104 $ 8,261 Provision for product warranties 5,184 3,014 Direct and other charges to warranty liability (4,073 ) (2,790 ) End of period (1) $ 11,215 $ 8,485 (1) Short-term product warranty of $10,856 and long-term product warranty of $359 as of March 31, 2018, are included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet. Short-term product warranty of $8,071 and long-term product warranty of $414 as of March 31, 2017, are included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet.

Net Income Per Share (Tables)

Net Income Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income Per Share	The following table sets forth the computation of basic and diluted net income per share: Three Months Ended March 31, 2018 2017 Numerator: Net income $ 105,121 $ 65,060 Denominator: Shares used in net income per common share — basic 54,423,000 53,769,000 Effect of dilutive securities: Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 863,000 1,189,000 Shares used in net income per common share — diluted 55,286,000 54,958,000 Net income per common share: Basic $ 1.93 $ 1.21 Diluted $ 1.90 $ 1.18

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income	The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows: Three Months Ended Three Months Ended Cost of revenue $ 1,005 $ 930 Research and development expense 722 745 Selling, general and administrative expense 8,699 7,107 Total pre-tax stock-based compensation expense $ 10,426 $ 8,782
Summary of Activity for RSUs	The following table presents the activity for RSUs under the Plan: Three Months Ended March 31, 2018 Outstanding RSUs Weighted Average RSUs — beginning of period 943,379 $ 47.57 Accrued dividend shares 18 124.85 Granted 122,831 109.62 Vested (204,290 ) 40.96 Forfeited (23,740 ) 61.63 RSUs — end of period 838,198 $ 57.88
Stock Appreciation Rights (SARs) [Member]
Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights	The following table presents the activity for SARs under the Plan: Three Months Ended March 31, 2018 Outstanding SARs Weighted Average SARs — beginning of period 282,907 $ 28.62 Exercised (17,775 ) 27.90 Forfeited or expired (773 ) 31.13 SARs Outstanding — end of period 264,359 $ 28.66

Business Segment, Geographic 38

Business Segment, Geographic Area, Product and Significant Customer Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Net Revenues, Assets and Goodwill by Reportable Segment	The following are net revenues by reportable segment: Three Months Ended March 31, 2018 2017 Vacuum & Analysis $ 348,344 $ 277,984 Light & Motion 205,931 159,169 $ 554,275 $ 437,153 The following are segment assets by reportable segment: March 31, 2018: Vacuum & Analysis Light & Motion Corporate, Total Segment assets: Accounts receivable $ 225,822 $ 131,677 $ (15,781 ) $ 341,718 Inventory, net 216,237 149,472 — 365,709 Total segment assets $ 442,059 $ 281,149 $ (15,781 ) $ 707,427 December 31, 2017: Vacuum & Analysis Light & Motion Corporate, Total Segment assets: Accounts receivable $ 201,318 $ 119,934 $ (20,944 ) $ 300,308 Inventory, net 197,831 141,250 — 339,081 Total segment assets $ 399,149 $ 261,184 $ (20,944 ) $ 639,389 Goodwill associated with each of the Company’s reportable segments is as follows: March 31, 2018 December 31, 2017 Reportable segment: Vacuum & Analysis $ 197,689 $ 197,617 Light & Motion 395,805 393,430 Total goodwill $ 593,494 $ 591,047
Reconciliation of Segment Gross Profit to Consolidated Net Income	The following is a reconciliation of segment gross profit to consolidated net income: Three Months Ended March 31, 2018 2017 Gross profit by reportable segment: Vacuum & Analysis $ 158,500 $ 128,924 Light & Motion 104,355 76,623 Total gross profit by reportable segment 262,855 205,547 Operating expenses: Research and development 34,857 33,282 Selling, general and administrative 82,949 74,220 Acquisition and integration costs — 1,442 Restructuring 1,220 522 Environmental costs 1,000 — Amortization of intangible assets 11,190 12,501 Income from operations 131,639 83,580 Interest and other expense, net (4,897 ) (6,295 ) Income before income taxes 126,742 77,285 Provision for income taxes 21,621 12,225 Net income $ 105,121 $ 65,060
Schedule of Capital Expenditures, Depreciation and Amortization Expense of Intangible Assets by Reportable Segment	The following are capital expenditures by reportable segment for the three months ended March 31, 2018 and 2017: Vacuum & Analysis Light & Motion Total Three Months Ended March 31, 2018: Capital expenditures $ 6,197 $ 3,193 $ 9,390 Three Months Ended March 31, 2017: Capital expenditures $ 2,374 $ 1,725 $ 4,099 The following are depreciation and amortization of intangible assets by reportable segment for the three months ended March 31, 2018 and 2017: Vacuum & Analysis Light & Motion Total Three Months Ended March 31, 2018: Depreciation and amortization $ 5,129 $ 15,363 $ 20,492 Three Months Ended March 31, 2017: Depreciation and amortization $ 5,122 $ 16,711 $ 21,833
Reconciliation of Segment Assets to Consolidated Total Assets	A reconciliation of segment assets to consolidated total assets is as follows: March 31, 2018 December 31, 2017 Total segment assets $ 707,427 $ 639,389 Cash and cash equivalents, restricted cash and investments 552,343 553,976 Other current assets 59,093 53,543 Property, plant and equipment, net 172,802 171,782 Goodwill and intangible assets, net 949,839 957,445 Other assets 39,952 37,883 Consolidated total assets $ 2,481,456 $ 2,414,018
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 March 31, 2018 2017 Net revenues: United States $ 276,720 $ 218,050 Korea 54,011 44,878 Japan 58,274 37,792 Asia (excluding Korea and Japan) 101,384 88,243 Europe 63,886 48,190 $ 554,275 $ 437,153 March 31, 2018 December 31, 2017 Long-lived assets: (1) United States $ 127,637 $ 124,689 Europe 28,787 28,820 Asia 49,566 49,645 $ 205,990 $ 203,154 (1) Long-lived assets include property, plant and equipment, net and certain other long-term assets, excluding long-term tax related accounts.
Worldwide Net Revenue for Each Group of Products	The following table sets forth worldwide net revenue for each group of products: Three Months Ended March 31, 2018 2017 Analytical and Control Solutions Products $ 33,712 $ 31,820 Power, Plasma and Reactive Gas Solutions Products 167,052 122,800 Vacuum Solutions Products 147,580 123,364 Lasers Products 74,797 44,944 Optics Products 54,379 46,505 Photonics Products 76,755 67,720 $ 554,275 $ 437,153
Customers with Net Revenues Greater than 10% of Total Net Revenues	The Company had two customers with net revenues greater than 10% of total net revenues in the periods shown below: Three Months Ended March 31, 2018 2017 LAM Research Corporation. 12.6 % 12.6 % Applied Materials, Inc. 12.2 % 13.0 %

Restructuring (Tables)

Restructuring (Tables)	3 Months Ended
	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Schedule of Company's Restructuring Activity	Restructuring activities were as follows: Three Months Ended March 31, 2018 2017 Beginning of period $ 3,244 $ 540 Charged to expense 1,220 522 Payments and adjustments (1,806 ) (347 ) End of period $ 2,658 $ 715

Basis of Presentation - Revised

Basis of Presentation - Revised Presentation of Previously Issued Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net revenues:
Products	$ 496,677	$ 387,938
Services	57,598	49,215
Total net revenues	554,275	437,153
Cost of revenues:
Cost of products	261,321	205,834
Cost of services	30,099	25,772
Total cost of revenues	$ 291,420	231,606
As Previously Reported [Member]
Net revenues:
Products		392,922
Services		44,231
Total net revenues		437,153
Cost of revenues:
Cost of products		205,060
Cost of services		26,546
Total cost of revenues		231,606
Adjustment [Member]
Net revenues:
Products		(4,984)
Services		4,984
Cost of revenues:
Cost of products		774
Cost of services		$ (774)

Revenue From Contracts With C41

Revenue From Contracts With Customers - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Retained earnings opening balance sheet adjustment for Topic 606 adoption	$ 892,820		$ 795,698
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Retained earnings opening balance sheet adjustment for Topic 606 adoption		$ 1,809
Accounting Standards Update 2014-09 [Member] | Maximum [Member]
Disaggregation of Revenue [Line Items]
Term of installation services	14 days
Company's normal payment terms	60 days
Warranty period	24 months
Term of separately priced contracts	60 months
Accounting Standards Update 2014-09 [Member] | Minimum [Member]
Disaggregation of Revenue [Line Items]
Company's normal payment terms	30 days
Warranty period	12 months
Term of separately priced contracts	12 months

Revenue From Contracts With C42

Revenue From Contracts With Customers - Schedule of Deferred Revenue by Arrangement (Detail)	3 Months Ended
	Mar. 31, 2018USD ($)
Deferred Revenue [Abstract]
Beginning balance, January 1,	$ 14,448
Amount of deferred revenue recognized in income	(4,757)
Additions to deferred revenue	7,639
Ending balance, March 31,	$ 17,330

Revenue From Contracts With C43

Revenue From Contracts With Customers - Schedule of Deferred Revenue by Arrangement (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Deferred Revenue [Abstract]
Deferred revenue, current	$ 14,003	$ 11,322	$ 12,842
Long-term deferred revenue	$ 3,327	$ 3,126

Revenue From Contracts With C44

Revenue From Contracts With Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	$ 554,275	$ 437,153
Products [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	496,677	387,938
Services [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	57,598	49,215
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	348,344	277,984
Vacuum & Analysis [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	304,336	241,455
Vacuum & Analysis [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	44,008	36,529
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	205,931	159,169
Light & Motion [Member] | Products [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	192,341	146,483
Light & Motion [Member] | Services [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	$ 13,590	$ 12,686

Revenue From Contracts With C45

Revenue From Contracts With Customers - Summary of Revenue from Contracts with Customers by Major Market (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	$ 554,275	$ 437,153
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	348,344	277,984
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	205,931	159,169
Semiconductor [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	313,514	248,504
Semiconductor [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	275,701	218,804
Semiconductor [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	37,813	29,700
Advanced Markets [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	240,761	188,649
Advanced Markets [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	72,643	59,180
Advanced Markets [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue	$ 168,118	$ 129,469

Investments - Investments Class

Investments - Investments Classified as Short-Term Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 200,614	$ 209,434
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	10,459	9,757
Bankers Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	2,179	5,330
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	38,012	36,990
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	16,010	13,750
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	78,767	77,821
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	2,618	1,970
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	30,220	28,078
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 22,349	$ 35,738

Investments - Investments Cla47

Investments - Investments Classified as Long-Term Available-for-Sale Investments and Long-Term Cost Method Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities and Cost-method Investments [Line Items]
Investments classified as long-term	$ 10,841	$ 10,655
Available-for-Sale Investments [Member] | Group Insurance Contracts [Member]
Schedule of Available-for-sale Securities and Cost-method Investments [Line Items]
Investments classified as long-term	6,441	6,255
Cost-method Investments [Member] | Minority Interest in Private Company [Member]
Schedule of Available-for-sale Securities and Cost-method Investments [Line Items]
Investments classified as long-term	$ 4,400	$ 4,400

Investments - Gross Unrealized

Investments - Gross Unrealized Gains and (Losses) Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	$ 200,695	$ 209,453
Investments, Gross Unrealized Gains	82	108
Investments, Gross Unrealized (Losses)	(163)	(127)
Investments, Estimated Fair Value	200,614	209,434
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	10,458	9,756
Investments, Gross Unrealized Gains	1	1
Investments, Estimated Fair Value	10,459	9,757
Bankers Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	2,179	5,330
Investments, Estimated Fair Value	2,179	5,330
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	38,056	37,017
Investments, Gross Unrealized Gains	13	15
Investments, Gross Unrealized (Losses)	(57)	(42)
Investments, Estimated Fair Value	38,012	36,990
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	16,065	13,810
Investments, Gross Unrealized (Losses)	(55)	(60)
Investments, Estimated Fair Value	16,010	13,750
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	78,778	77,788
Investments, Gross Unrealized Gains	38	58
Investments, Gross Unrealized (Losses)	(49)	(25)
Investments, Estimated Fair Value	78,767	77,821
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	2,620	1,970
Investments, Gross Unrealized (Losses)	(2)
Investments, Estimated Fair Value	2,618	1,970
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	30,196	28,054
Investments, Gross Unrealized Gains	24	24
Investments, Estimated Fair Value	30,220	28,078
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	22,343	35,728
Investments, Gross Unrealized Gains	6	10
Investments, Estimated Fair Value	22,349	35,738
Group Insurance Contracts [Member] | Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	6,382	6,006
Investments, Gross Unrealized Gains	59	249
Investments, Estimated Fair Value	$ 6,441	$ 6,255

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities		$ 6,198
Available-for-sale investments	$ 200,614	209,434
Short-term investments	200,614	209,434
Derivatives - contracts		168
Other assets	39,952	37,883
Derivatives - liabilities		6,198
Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - contracts	8,170	6,179
Derivatives - interest rate hedge - non-current	8,170	6,179
Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	274,666	274,765
Cash and cash equivalents	44,207	37,562
Restricted cash	118	119
Short-term investments	200,614	209,434
Derivatives - contracts	85	168
Total current assets	245,024	247,283
Available-for-sale investments	6,441	6,255
Other assets	23,201	21,227
Total long-term assets	29,642	27,482
Derivatives - liabilities	8,273	6,198
Fair Value Measurements, Recurring [Member] | Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - contracts	85	168
Derivatives - liabilities	8,273	6,198
Fair Value Measurements, Recurring [Member] | Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - interest rate hedge - non-current	8,170	6,179
Money Market Funds [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,075	4,987
Restricted cash	118	119
Time Deposits and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		9,757
Time Deposits and Certificates of Deposit [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		2,100
Available-for-sale investments	10,459
Bankers Acceptance Drafts [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2,179	5,330
U.S. Agency Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	9,509
Available-for-sale investments	22,349	35,738
Asset-Backed Securities [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	38,012	36,990
U.S. Treasury Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	12,953
Available-for-sale investments	30,220	28,078
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,193	5,106
Cash and cash equivalents	1,075	4,987
Restricted cash	118	119
Total current assets	1,193	5,106
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] | Money Market Funds [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,075	4,987
Restricted cash	118	119
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities		6,198
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	273,473	269,659
Cash and cash equivalents	43,132	32,575
Short-term investments	200,614	209,434
Derivatives - contracts	85	168
Total current assets	243,831	242,177
Available-for-sale investments	6,441	6,255
Other assets	23,201	21,227
Total long-term assets	29,642	27,482
Derivatives - liabilities	8,273	6,198
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member] | Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - contracts	85	168
Derivatives - liabilities	8,273	6,198
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - interest rate hedge - non-current	8,170	6,179
Significant Other Observable Inputs (Level 2) [Member] | Time Deposits and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		9,757
Significant Other Observable Inputs (Level 2) [Member] | Time Deposits and Certificates of Deposit [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		2,100
Available-for-sale investments	10,459
Significant Other Observable Inputs (Level 2) [Member] | Bankers Acceptance Drafts [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2,179	5,330
Significant Other Observable Inputs (Level 2) [Member] | U.S. Agency Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	9,509
Available-for-sale investments	22,349	35,738
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	38,012	36,990
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	12,953
Available-for-sale investments	30,220	28,078
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	16,010	13,750
Commercial Paper [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	18,385	30,475
Available-for-sale investments	16,010	13,750
Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	18,385	30,475
Available-for-sale investments	16,010	13,750
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	78,767	77,821
Corporate Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	950
Available-for-sale investments	78,767	77,821
Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	950
Available-for-sale investments	78,767	77,821
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	2,618	1,970
Municipal Bonds [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,335
Available-for-sale investments	2,618	1,970
Municipal Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,335
Available-for-sale investments	2,618	1,970
Group Insurance Contracts [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	6,441	6,255
Group Insurance Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	6,441	6,255
Israeli Pension Assets [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	15,031	15,048
Israeli Pension Assets [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	$ 15,031	$ 15,048

Fair Value Measurements - Sch50

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements	$ 294,903	$ 292,808
Non-Negotiable Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash/Non-negotiable time deposits - not subject to fair value disclosure requirements	$ 1,660	$ 3,398

Derivatives - Additional Inform

Derivatives - Additional Information (Detail) - USD ($)	Sep. 30, 2016	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum period for hedging a portion of forecasted foreign currency denominated intercompany sales of inventory		18 months
Gross notional values of outstanding forward foreign exchange contracts		$ 228,463,000	$ 208,922,000
Accumulated other comprehensive income realization period		12 months
Interest Rate Hedge [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Percentage of debt which is subject to interest rate swap fixed rate	50.00%
Interest rate swap agreement, credit spread rate		2.00%
Interest rate swap agreement, maturity date	Sep. 30, 2020
Interest rate swap agreement, notional amount		$ 305,000,000	305,000,000
Interest rate swap agreement, interest rate description		The Company entered into an interest rate swap agreement to fix the rate on approximately 50% of its then-outstanding balance under the Credit Agreement, as described further in Note 10. This hedge fixes the interest rate paid on the hedged debt at 1.198% per annum plus the applicable credit spread, which was 2.00% as of March 31, 2018, through September 30, 2020.
Interest rate swap agreement, fair value		$ 8,170,000	$ 6,179,000
Cash Flow Hedging [Member] | Interest Rate Hedge [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap agreement, interest rate	1.198%

Derivatives - Summary of Primar

Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 228,463	$ 208,922
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(8,188)	(6,030)
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	75,339	70,175
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(3,212)	(233)
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	85,680	79,672
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(2,772)	(3,799)
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	33,186	26,140
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(1,068)	(1,047)
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	13,807	12,104
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(512)	(337)
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	20,451	20,831
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	$ (624)	$ (614)

Derivatives - Summary of Fair V

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative assets		$ 168
Derivative liabilities		(6,198)
Total net derivative (liability) asset designated as hedging instruments	$ (8,188)	(6,030)
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total net derivative (liability) asset designated as hedging instruments	(18)	149
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	85
Derivative liabilities	(8,273)
Foreign Exchange Contracts [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	85	168
Derivative liabilities	(8,273)	(6,198)
Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	8,170	6,179
Interest Rate Hedge [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	$ 8,170	$ 6,179

Derivatives - Summary of Fair54

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative asset classified in other current assets		$ 168
Derivative liability classified in other current liabilities		(6,198)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative asset classified in other current assets	$ 85
Derivative liability classified in other current liabilities	(8,273)
Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Derivative asset classified in other current assets	$ 8,170	$ 6,179

Derivatives - Summary of (Losse

Derivatives - Summary of (Losses) Gains on Derivatives Designated as Cash Flow Hedging Instruments (Detail) - Forward Exchange Contracts [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in OCI	$ 66	$ (4,271)
Net (loss) gain reclassified from accumulated OCI into income	$ (2,539)	$ 452

Derivatives - Summary of Losses

Derivatives - Summary of Losses on Derivatives Not Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Forward Exchange Contracts [Member]
Derivative Instruments Gain Loss Not Designated As Hedging Instruments [Line Items]
Net loss recognized in income	$ (1,253)	$ (1,463)

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 203,520	$ 191,351
Work-in-process	62,212	54,050
Finished goods	99,977	93,680
Inventories	$ 365,709	$ 339,081

Dispositions - Additional Infor

Dispositions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 30, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Total proceeds from sale of business unit, net of cash sold	$ 72,509
Pre-tax gain	$ 74,856
Net revenues		$ 554,275	$ 437,153
Data Analytics Solutions Business [Member]
Business Acquisition [Line Items]
Net revenues				$ 12,700

Goodwill and Intangible Asset59

Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance, Goodwill Gross Carrying Amount	$ 735,323	$ 727,999
Sale of business, Gross Carrying Amount		(3,115)
Foreign currency translation, Gross Carrying Amount	2,447	10,439
Ending balance, Goodwill Gross Carrying Amount	737,770	735,323
Beginning balance, Accumulated Impairment (Loss)	(144,276)	(139,414)
Impairment loss, Accumulated Impairment (Loss)		(4,862)
Foreign currency translation, Accumulated Impairment (Loss)	0	0
Ending balance, Accumulated Impairment (Loss)	(144,276)	(144,276)
Beginning balance, Goodwill Net	591,047	588,585
Sale of business, Net		(3,115)
Impairment loss, Net		(4,862)
Foreign currency translation, Net	2,447	10,439
Ending balance, Goodwill Net	$ 593,494	$ 591,047

Goodwill and Intangible Asset60

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

Goodwill and Intangible Asset61

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 565,698	$ 565,698
Impairment Charges	(1,511)	(1,511)
Accumulated Amortization	(210,994)	(199,619)
Foreign Currency Translation	3,152	1,830
Intangible assets, net	356,345	366,398
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	172,431	172,431
Impairment Charges	(105)	(105)
Accumulated Amortization	(120,898)	(115,371)
Foreign Currency Translation	425	333
Intangible assets, net	51,853	57,288
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	282,744	282,744
Impairment Charges	(1,406)	(1,406)
Accumulated Amortization	(50,138)	(45,518)
Foreign Currency Translation	2,682	1,571
Intangible assets, net	233,882	237,391
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	110,523	110,523
Accumulated Amortization	(39,958)	(38,730)
Foreign Currency Translation	45	(74)
Intangible assets, net	$ 70,610	$ 71,719

Goodwill and Intangible Asset62

Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 11,190	$ 12,501
Impairment Charges	1,511		$ 1,511
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment Charges	105		105
Completed Technology [Member] | Data Analytics Solutions Business [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets			4,155
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment Charges	$ 1,406		1,406
Customer Relationships [Member] | Data Analytics Solutions Business [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets			2,300
Patents, Trademarks, Trade Names and Other [Member] | Data Analytics Solutions Business [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets			$ 1,200

Goodwill and Intangible Asset63

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 11,190	$ 12,501
Amortization income from unfavorable lease commitments	$ 185	$ 177

Goodwill and Intangible Asset64

Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail) $ in Thousands	Mar. 31, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2018 (remaining)	$ 32,596
2,019	40,511
2,020	28,393
2,021	20,485
2,022	17,811
2,023	17,427
Thereafter	$ 140,413

Debt - Additional Information (

Debt - Additional Information (Detail)

Apr. 11, 2018

Jul. 06, 2017

Dec. 14, 2016

Sep. 30, 2016USD ($)

Jun. 09, 2016USD ($)

Sep. 30, 2016USD ($)

Mar. 31, 2018USD ($)Institution

Dec. 31, 2017USD ($)

Nov. 30, 2017USD ($)

Aug. 31, 2017USD ($)

Jul. 31, 2017USD ($)

Mar. 31, 2017USD ($)

Nov. 30, 2016USD ($)

Debt Instrument [Line Items]

Applicable margin for Term Loan Credit agreement

2.25%

Leverage ratio

1.25%

LIBOR floor rate

0.75%

Decrease in base rate borrowings margin

1.25%

Description of applicable margin

The Repricing Amendment 3 decreased the applicable margin for the Company's term loan under the Credit Agreement to 2.25% for LIBOR rate loans when the Total Leverage Ratio(as defined in the Credit Agreement) was at or above 1.251 and decreased to 2.00% when the Total Leverage Ratio was below 1.251, both with a LIBOR floor of 0.75%. The margin for base rate borrowings decreased to 1.25% when the Total Leverage Ratio is at or above 1.251 and to 1.00% when the Total Leverage Ratio is below 1.251.

Interest expense

$ 5,430,000

$ 8,832,000

Interest Rate Hedge [Member]

Debt Instrument [Line Items]

Interest rate swap agreement, maturity date

Sep. 30, 2020

Interest rate swap agreement, notional amount

$ 305,000,000

305,000,000

Interest rate swap agreement, credit spread rate

2.00%

Austria [Member]

Debt Instrument [Line Items]

Interest on loans payable

Semi-annually

Japan [Member]

Debt Instrument [Line Items]

Borrowing capacity in the form of letters of credit

$ 21,641,000

Number of financial institutions for available lines of credit and borrowing arrangements | Institution

2

Aggregate borrowings expire and renewed

3 month intervals

Total borrowings outstanding

$ 0

0

Minimum [Member] | Austria [Member]

Debt Instrument [Line Items]

Loan interest rate

0.75%

Maximum [Member] | Austria [Member]

Debt Instrument [Line Items]

Loan interest rate

2.00%

Revolving Lines of Credit [Member]

Debt Instrument [Line Items]

Borrowing capacity in the form of letters of credit

$ 9,879,000

Revolving Lines of Credit [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Line of credit base interest rate

1.25%

Subsequent Event [Member]

Debt Instrument [Line Items]

Applicable margin for Term Loan Credit agreement

1.75%

LIBOR floor rate

0.75%

Decrease in base rate borrowings margin

0.75%

Description of applicable margin

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

Newport [Member] | Revolving Lines of Credit [Member]

Debt Instrument [Line Items]

Total borrowings outstanding

$ 3,828,000

$ 2,965,000

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

2.50%

Debt instrument, pre-payment premium percentage

1.00%

Debt instrument, pre-payment premium

$ 7,300,000

Debt instrument, prepaid principal amount

$ 50,000,000

Debt instrument, prepaid amount

$ 60,000,000

Deferred finance fees, original issue discount and re-pricing fee, gross

28,747,000

Deferred finance fees, original issue discount and re-pricing fee, net

7,226,000

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member] | Interest Rate Hedge [Member]

Debt Instrument [Line Items]

Interest rate swap agreement, maturity date

Sep. 30, 2020

Interest rate swap agreement, notional amount

$ 335,000,000

$ 335,000,000

$ 305,000,000

Interest rate swap agreement, interest rate

1.198%

1.198%

Interest rate swap agreement, credit spread rate

2.00%

Interest rate swap agreement, fair value

$ 8,170

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member] | Maximum [Member]

Debt Instrument [Line Items]

Debt instrument, quarterly payment percentage

0.25

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

3.50%

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 2 [Member]

Debt Instrument [Line Items]

Secured term loan, face amount

$ 348,464,000

Debt instrument, prepaid principal amount

425,000,000

$ 50,000,000

$ 75,000,000

$ 50,000,000

$ 50,000,000

$ 40,000,000

Debt instrument, prepaid principal amount

$ 6,536,000

Debt instrument, stated percentage

3.648%

Base rate floor

1.75%

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 2 [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

2.75%

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 2 [Member] | Base Rate [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

1.75%

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt [Member]

Debt Instrument [Line Items]

Secured term loan, face amount

$ 780,000,000

Debt instrument, interest rate terms

Borrowings under the Term Loan Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, and (4) a floor of 1.75%, plus, in each case, an applicable margin based on the Company’s leverage ratio (1.25% as of March 31, 2018); or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR rate floor of 0.75%, plus an applicable margin based on our leverage ratio (2.00% as of March 31, 2018). The Company has elected the interest rate as described in clause (b). The Credit Agreement provides that all loans will be determined by reference to the Base Rate if the LIBOR rate cannot be ascertained, if regulators impose material restrictions on the authority of a lender to make LIBOR rate loans, and for other reasons. The Term Loan Facility was issued with original issue discount of 1.00% of the principal amount thereof.

Debt instrument, issue discount percentage on principal

1.00%

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt [Member] | Federal Funds Rate [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

0.50%

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt [Member] | Adjusted One Month LIBOR [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

1.00%

Period of Libor measurement

1 month

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt [Member] | Floor Rate [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

1.75%

Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt [Member] | LIBOR Floor Rate [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

0.75%

Newport [Member] | Asset Based Credit Agreement [Member]

Debt Instrument [Line Items]

Debt issuance cost capitalized

$ 1,201,000

Contractual term

5 years

Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member]

Debt Instrument [Line Items]

Secured term loan, face amount

$ 50,000,000

Debt instrument, interest rate terms

Borrowings under the ABL Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, and (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, plus, in each case, an initial applicable margin of 0.75%; and (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, plus an initial applicable margin of 1.75%.

Percentage of borrowing based on eligible accounts

85.00%

Percentage of borrowing based on lower of cost or market value of certain eligible inventory

65.00%

Percentage of borrowing based on net orderly liquidation value of certain eligible inventory

85.00%

Percentage of borrowing base

30.00%

Initial commitment fee percentage

0.375%

Total commitment fee recognized in interest expense

$ 95,000

Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Maximum [Member]

Debt Instrument [Line Items]

Percentage of borrowing based on book value of certain eligible accounts

70.00%

Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

1.75%

Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Federal Funds Rate [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

0.50%

Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Adjusted One Month LIBOR [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

1.00%

Period of Libor measurement

1 month

Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Initial Margin Rate [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

0.75%

Newport [Member] | Asset Based Credit Agreement [Member] | Letter of Credit [Member]

Debt Instrument [Line Items]

Borrowing capacity in the form of letters of credit

$ 15,000,000

Debt - Schedule of Short Term D

Debt - Schedule of Short Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Short term debt	$ 5,456	$ 2,972
Other Debt [Member]
Short-term Debt [Line Items]
Short term debt	6	7
Japan [Member] | Line of Credit [Member]
Short-term Debt [Line Items]
Short term debt	3,915	2,750
Japan [Member] | Receivables Financing Facility [Member]
Short-term Debt [Line Items]
Short term debt	854	$ 215
Austria [Member] | Loans Due Through March 2019 [Member]
Short-term Debt [Line Items]
Short term debt	$ 681

Debt - Schedule of Long Term De

Debt - Schedule of Long Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long term debt	$ 341,290	$ 389,993
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Long term debt	341,238	389,279
Austria [Member] | Loans Due Through March 2020 [Member]
Debt Instrument [Line Items]
Long term debt	$ 52	$ 714

Debt - Schedule of Long Term 68

Debt - Schedule of Long Term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Deferred financing fees, original issuance discount and re-pricing fee	$ 7,226	$ 9,185

Debt - Schedule of Contractual

Debt - Schedule of Contractual Maturities of Debt Obligations (Detail) $ in Thousands	Mar. 31, 2018USD ($)
Maturities of Long-term Debt [Abstract]
2018 (remaining)	$ 4,788
2,019	668
2,020	52
2,021	0
2,022	0
Thereafter	$ 348,464

Product Warranties - Product Wa

Product Warranties - Product Warranty Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Guarantees [Abstract]
Beginning of period	$ 10,104	$ 8,261
Provision for product warranties	5,184	3,014
Direct and other charges to warranty liability	(4,073)	(2,790)
End of period	$ 11,215	$ 8,485

Product Warranties - Product 71

Product Warranties - Product Warranty Activities (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Guarantees [Abstract]
Short-term product warranty	$ 10,856	$ 8,071
Long-term product warranty	$ 359	$ 414

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal corporate income tax rate	21.00%		35.00%
Adjustment to provisional tax benefit	$ 790,000
Adjustment increase of effective tax rate	1.00%
Effective tax rate	17.10%	15.80%
Accrued interest on unrecognized tax benefits	$ 532,000		$ 327,000
Gross unrecognized tax benefits excluding interest and penalties	27,938		$ 27,345
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate	20,525
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions	$ 1,047

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
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income	$ 105,121	$ 65,060
Denominator:
Shares used in net income per common share - basic	54,423,000	53,769,000
Effect of dilutive securities:
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan	863,000	1,189,000
Shares used in net income per common share - diluted	55,286,000	54,958,000
Net income per common share:
Basic	$ 1.93	$ 1.21
Diluted	$ 1.90	$ 1.18

Net Income Per Share - Addition

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Number of shares excluded from computation of diluted earnings per share	380	0
Stock Appreciation Rights (SARs) [Member]
Earnings Per Share [Line Items]
Number of shares excluded from computation of diluted earnings per share	0	0

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Jul. 25, 2011	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Common stock, value of shares authorized to repurchase	$ 200,000,000
Stock repurchase, shares	1,770,000	0	0
Value of shares repurchased	$ 52,000,000
Cash dividends per common share		$ 0.180	$ 0.175
Dividend payment to common shareholders		$ 9,808,000	$ 9,419,000

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense related to unvested stock-based awards granted to employees, officers and directors	$ 22,844
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted	122,831	171,179
Restricted stock units, weighted average grant date fair value	$ 109.62	$ 66.06
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted	0	0

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 10,426	$ 8,782
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	1,005	930
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	722	745
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 8,699	$ 7,107

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Activity for RSUs (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs - beginning of period	943,379
Granted	122,831	171,179
Vested	(204,290)
Forfeited or expired	(23,740)
RSUs - end of period	838,198
RSUs/SARs, Weighted Average Grant Date Fair Value, Beginning of period	$ 47.57
Weighted Average Grant Date Fair Value, Granted	109.62	$ 66.06
Weighted Average Grant Date Fair Value, Vested	40.96
Weighted Average Grant Date Fair Value, Forfeited or expired	61.63
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period	$ 57.88
Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued dividend shares	18
Weighted Average Grant Date Fair Value, Accrued dividend shares	$ 124.85

Stock-Based Compensation - Su79

Stock-Based Compensation - Summary of Activity for SARs (Detail) - Stock Appreciation Rights (SARs) [Member]	3 Months Ended
	Mar. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs - beginning of period | shares	282,907
Exercised, Outstanding SARs | shares	(17,775)
Forfeited or expired, Outstanding SARs | shares	(773)
RSUs - end of period | shares	264,359
RSUs/SARs, Weighted Average Grant Date Fair Value, Beginning of period | $ / shares	$ 28.62
Exercised, Weighted Average Grant Date Fair Value | $ / shares	27.90
Forfeited or expired, Weighted Average Grant Date Fair Value | $ / shares	31.13
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period | $ / shares	$ 28.66

Business Segment, Geographic 80

Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018SegmentCustomerProduct
Segment Reporting [Abstract]
Number of reportable segments | Segment	2
Number of product groups | Product	6
Number of customers with net revenues greater than 10% of total net revenues | Customer	2
Entity wide net revenue major customer percentage minimum	10.00%

Business Segment, Geographic 81

Business Segment, Geographic Area, Product and Significant Customer Information - Net Revenues by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total net revenues	$ 554,275	$ 437,153
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Total net revenues	348,344	277,984
Light & Motion [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 205,931	$ 159,169

Business Segment, Geographic 82

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
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Gross profit	$ 262,855	$ 205,547
Research and development	34,857	33,282
Selling, general and administrative	82,949	74,220
Acquisition and integration costs		1,442
Restructuring	1,220	522
Environmental costs	1,000
Amortization of intangible assets	11,190	12,501
Income from operations	131,639	83,580
Interest and other expense, net	(4,897)	(6,295)
Income before income taxes	126,742	77,285
Provision for income taxes	21,621	12,225
Net income	105,121	65,060
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit	158,500	128,924
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 104,355	$ 76,623

Business Segment, Geographic 83

Business Segment, Geographic Area, Product and Significant Customer Information - Schedule of Capital Expenditures, Depreciation and Amortization Expense of Intangible Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Capital expenditures	$ 9,390	$ 4,099
Depreciation and amortization	20,492	21,833
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Capital expenditures	6,197	2,374
Depreciation and amortization	5,129	5,122
Light & Motion [Member]
Segment Reporting Information [Line Items]
Capital expenditures	3,193	1,725
Depreciation and amortization	$ 15,363	$ 16,711

Business Segment, Geographic 84

Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Accounts receivable	$ 341,718	$ 300,308
Inventory, net	365,709	339,081
Total assets	2,481,456	2,414,018
Operating Segments [Member]
Segment Reporting Information [Line Items]
Accounts receivable	341,718	300,308
Inventory, net	365,709	339,081
Total assets	707,427	639,389
Operating Segments [Member] | Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	225,822	201,318
Inventory, net	216,237	197,831
Total assets	442,059	399,149
Operating Segments [Member] | Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	131,677	119,934
Inventory, net	149,472	141,250
Total assets	281,149	261,184
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(15,781)	(20,944)
Total assets	$ (15,781)	$ (20,944)

Business Segment, Geographic 85

Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 2,481,456	$ 2,414,018
Other current assets	59,093	53,543
Property, plant and equipment, net	172,802	171,782
Other assets	39,952	37,883
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	707,427	639,389
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents, restricted cash and investments	552,343	553,976
Other current assets	59,093	53,543
Property, plant and equipment, net	172,802	171,782
Goodwill and intangible assets, net	949,839	957,445
Other assets	$ 39,952	$ 37,883

Business Segment, Geographic 86

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
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 554,275	$ 437,153
Long-lived assets	205,990		$ 203,154
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	276,720	218,050
Long-lived assets	127,637		124,689
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	54,011	44,878
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	58,274	37,792
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	101,384	88,243
Long-lived assets	28,787		28,820
Asia (Excluding Korea and Japan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	63,886	$ 48,190
Long-lived assets	$ 49,566		$ 49,645

Business Segment, Geographic 87

Business Segment, Geographic Area, Product and Significant Customer Information - Summary of Goodwill Associated with Reportable Segments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Goodwill	$ 593,494	$ 591,047	$ 588,585
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Goodwill	197,689	197,617
Light & Motion [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 395,805	$ 393,430

Business Segment, Geographic 88

Business Segment, Geographic Area, Product and Significant Customer Information - Worldwide Net Revenue for Each Group of Products (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Net sales from product groups	$ 554,275	$ 437,153
Analytical and Control Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	33,712	31,820
Power Plasma and Reactive Gas Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	167,052	122,800
Vacuum Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	147,580	123,364
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	74,797	44,944
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	54,379	46,505
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 76,755	$ 67,720

Business Segment, Geographic 89

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
	Mar. 31, 2018	Mar. 31, 2017
LAM Research Corporation [Member]
Revenue, Major Customer [Line Items]
Percentage of total net revenues	12.60%	12.60%
Applied Materials, Inc [Member]
Revenue, Major Customer [Line Items]
Percentage of total net revenues	12.20%	13.00%

Restructuring - Additional Info

Restructuring - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)Facilities
Reorganizations [Abstract]
Restructuring charges | $	$ 1,220	$ 522
Number of facilities consolidated | Facilities		1

Restructuring - Schedule of Com

Restructuring - Schedule of Company's Restructuring Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring and Related Activities [Abstract]
Beginning of period	$ 3,244	$ 540
Charged to expense	1,220	522
Payments and adjustments	(1,806)	(347)
End of period	$ 2,658	$ 715