MKS Instruments (MKSI) 10-Q 8 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 01, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	MKSI
Entity Registrant Name	MKS INSTRUMENTS INC
Entity Central Index Key	0001049502
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		54,357,260

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 418,016	$ 644,345
Short-term investments	44,326	73,826
Trade accounts receivable, net of allowance for doubtful accounts of $4,968 and $5,243 at March 31, 2019 and December 31, 2018, respectively	335,990	295,454
Inventories	475,633	384,689
Other current assets	86,387	65,790
Total current assets	1,360,352	1,464,104
Property, plant and equipment, net	251,424	194,367
Right-of-use asset	65,628
Goodwill	1,057,331	586,996
Intangible assets, net	619,091	319,807
Long-term investments	10,350	10,290
Other assets	48,562	38,682
Total assets	3,412,738	2,614,246
Current liabilities:
Short-term debt	10,281	3,986
Accounts payable	95,317	83,825
Accrued compensation	61,523	82,350
Income taxes payable	14,355	16,358
Lease liability	19,459
Deferred revenue and customer advances	21,056	14,246
Other current liabilities	74,568	62,520
Total current liabilities	296,559	263,285
Long-term debt, net	976,823	343,842
Non-current deferred taxes	78,904	48,223
Non-current accrued compensation	60,337	55,598
Non-current lease liability	49,392
Other liabilities	29,862	30,111
Total liabilities	1,491,877	741,059
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; 54,231,772 and 54,039,554 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	113	113
Additional paid-in capital	844,261	793,932
Retained earnings	1,086,409	1,084,797
Accumulated other comprehensive loss	(9,922)	(5,655)
Total stockholders' equity	1,920,861	1,873,187
Total liabilities and stockholders' equity	$ 3,412,738	$ 2,614,246

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4,968	$ 5,243
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	54,231,772	54,039,554
Common stock, shares outstanding	54,231,772	54,039,554

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Net revenues:
Net revenues		$ 463,561	$ 554,275
Cost of revenues
Cost of revenues		265,443	291,420
Gross profit		198,118	262,855
Research and development		38,933	34,857
Selling, general and administrative		82,455	82,949
Fees and expenses related to incremental term loan		5,847
Acquisition and integration costs		30,167
Restructuring		223	1,220
Customer contract obligation		1,700
Environmental costs			1,000
Amortization of intangible assets		15,727	11,190
Income from operations		23,066	131,639
Interest income		1,714	1,105
Interest expense		9,119	5,430
Other expense, net		325	572
Income before income taxes		15,336	126,742
Provision for income taxes		2,881	21,621
Net income		12,455	105,121
Other comprehensive income:
Changes in value of financial instruments designated as cash flow hedges, net of tax expense (benefit)	[1]	52	178
Foreign currency translation adjustments, net of tax of $0		(4,268)	10,771
Unrecognized pension loss, net of tax benefit	[2]	(1)	(85)
Unrealized loss on investments, net of tax benefit	[3]	(50)	(59)
Total comprehensive income		$ 8,188	$ 115,926
Net income per share:
Basic		$ 0.23	$ 1.93
Diluted		$ 0.23	$ 1.90
Weighted average common shares outstanding:
Basic		54,147	54,423
Diluted		54,848	55,286
Products [Member]
Net revenues:
Net revenues		$ 397,363	$ 496,677
Cost of revenues
Cost of revenues		229,710	261,321
Services [Member]
Net revenues:
Net revenues		66,198	57,598
Cost of revenues
Cost of revenues		$ 35,733	$ 30,099
[1]	Tax expense (benefit) was $15 and ($112) for the three months ended March 31, 2019 and 2018, respectively.
[2]	Tax benefit was $21 and $36 for the three months ended March 31, 2019 and 2018, respectively.
[3]	Tax benefit was $16 and $17 for the three months ended March 31, 2019 and 2018, respectively.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges	$ 15	$ (112)
Tax on foreign currency translation adjustments	0	0
Tax benefit on unrecognized pension loss	21	36
Tax benefit on unrealized loss on investments	$ 16	$ 17

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]
Beginning Balance at Dec. 31, 2017	$ 1,588,907	$ 113	$ 789,644	$ 795,698	$ 3,452
Beginning Balance, Shares at Dec. 31, 2017		54,355,535
Net issuance under stock-based plans	(8,920)		(8,920)
Net issuance under stock-based plans, Shares		136,568
Stock-based compensation	10,426		10,426
Cash dividend	(9,808)			(9,808)
Comprehensive income (net of tax):
Net income	105,121			105,121
Other comprehensive gain	10,805				10,805
Ending Balance at Mar. 31, 2018	1,698,340	$ 113	791,150	892,820	14,257
Ending Balance, Shares at Mar. 31, 2018		54,492,103
Accounting standards codification topic 606 adjustment	1,809			1,809
Beginning Balance at Dec. 31, 2018	1,873,187	$ 113	793,932	1,084,797	(5,655)
Beginning Balance, Shares at Dec. 31, 2018		54,039,554
Net issuance under stock-based plans	22,491		22,491
Net issuance under stock-based plans, Shares		192,218
Stock-based compensation	27,838		27,838
Cash dividend	(10,843)			(10,843)
Comprehensive income (net of tax):
Net income	12,455			12,455
Other comprehensive gain	(4,267)				(4,267)
Ending Balance at Mar. 31, 2019	$ 1,920,861	$ 113	$ 844,261	$ 1,086,409	$ (9,922)
Ending Balance, Shares at Mar. 31, 2019		54,231,772

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividend, per common share	$ 0.20	$ 0.18

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 12,455	$ 105,121
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	25,211	20,492
Amortization of inventory step-up adjustment to fair value	5,140
Amortization of debt issuance costs, original issue discount, and soft call premium	1,202	2,019
Stock-based compensation	27,838	10,426
Provision for excess and obsolete inventory	5,063	5,333
(Recovery) provision for doubtful accounts	(440)	335
Deferred income taxes	(2,445)	(705)
Other	66	34
Changes in operating assets and liabilities, net of business acquired:
Trade accounts receivable	4,028	(37,336)
Inventories	(10,327)	(28,177)
Income taxes	(3,653)	8,822
Other current and non-current assets	4,804	(942)
Accrued compensation	(22,957)	(32,531)
Other current and non-current liabilities	359	10,544
Accounts payable	(17,294)	9,321
Net cash provided by operating activities	29,050	72,756
Cash flows used in investing activities:
Acquisition of business, net of cash acquired	(988,599)
Purchases of investments	(44,212)	(49,753)
Maturities of investments	18,684	49,596
Sales of investments	154,489	8,930
Proceeds from sale of assets	35
Purchases of property, plant and equipment	(14,529)	(9,390)
Net cash used in investing activities	(874,132)	(617)
Cash flows provided by (used in) financing activities:
Net proceeds from short and long-term borrowings	638,638	11,907
Payments on short-term borrowings	(176)	(10,274)
Payments on long-term borrowings		(50,000)
Net payments related to employee stock awards	(8,987)	(8,921)
Dividend payments to common stockholders	(10,843)	(9,808)
Net cash provided by (used in) financing activities	618,632	(67,096)
Effect of exchange rate changes on cash and cash equivalents	121	1,958
(Decrease) Increase in cash and cash equivalents and restricted cash	(226,329)	7,001
Cash and cash equivalents at beginning of period	644,345	333,887
Cash and cash equivalents at end of period	$ 418,016	$ 340,888

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2019
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, 2019, and for the three months ended March 31, 2019 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, 2018 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 10-K 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

Recently Issued Accounting Pron

Recently Issued Accounting Pronouncements	3 Months Ended
	Mar. 31, 2019
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	2) Recently Issued Accounting Pronouncements In October 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-16, In August 2018, the FASB issued ASU 2018-15, Other-Internal-Use 350-40): internal-use internal-use In August 2017, the FASB issued ASU 2017-12, In February 2016, the FASB issued ASU 2016-02, 2016-02 2016-02 right-of-use right-of-use re-classified right-of-use

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Text Block [Abstract]
Leases	3) Leases The Company has operating leases for real estate and non-real The Company has lease arrangements with lease and non-lease non-lease non-lease non-lease right-of-use The Company has existing leases that include variable lease and non-lease right-of-use A right-of-use The elements of lease expense were as follows: Three Months Ended March 31, 2019 Lease Cost: Operating lease cost $ 5,377 Other Information: Operating cash flows used for operating leases $ 5,711 Weighted average discount rate 3.81 % Weighted average remaining lease term 4.9 years Future lease payments under non-cancelable 2019 (remaining) $ 16,831 2020 18,608 2021 12,687 2022 7,518 2023 6,315 Thereafter 13,761 Total lease payments 75,720 Less: imputed interest 6,869 Total operating lease liabilities $ 68,851 Minimum lease payments under operating leases prior to adoption of ASU 2016-02 Year Ending December 31, Operating Leases 2019 $ 20,106 2020 17,142 2021 10,325 2022 5,573 2023 4,411 Thereafter 8,739 Total minimum lease payments $ 66,296

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	4) Revenue from Contracts with Customers Contract assets as of March 31, 2019 and December 31, 2018 were $3,624 and $3,624, respectively, and included in other current assets. A rollforward of the Company’s deferred revenue and customer advances is as follows: Three Months Ended Beginning balance, January 1 (1) $ 17,474 Deferred revenue and customer advances assumed in ESI Merger 3,314 Additions to deferred revenue and customer advances 17,219 Amount of deferred revenue and customer advances recognized in income (13,933 ) Ending balance, March 31 (2) $ 24,074 (1) Beginning deferred revenue and customer advances as of January 1, 2019 included $8,134 of current deferred revenue, $3,228 of long-term deferred revenue and $6,112 of current customer advances. (2) Ending deferred revenue as of March 31, 2019 included $13,322 of current deferred revenue, $3,018 of long-term deferred revenue and $7,734 of current customer advances. Disaggregation of Revenue The following table summarizes revenue from contracts with customers: Three Months Ended March 31, 2019 Vacuum & Light & Equipment & Total Net revenues: Products $ 192,648 $ 178,697 $ 26,018 $ 397,363 Services 41,707 15,291 9,200 66,198 Total net revenues $ 234,355 $ 193,988 $ 35,218 $ 463,561 Three Months Ended March 31, 2018 Vacuum & Light & Equipment & 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 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 is recorded over time. Refer to Note 17 for revenue by reportable segment, geography and groupings of similar products.

Investments

Investments	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investments	5) Investments The fair value of investments classified as short-term consists of the following: March 31, 2019 December 31, 2018 Available-for-sale Time deposits and certificates of deposit $ 101 $ 102 Bankers’ acceptance drafts 1,722 989 Asset-backed securities — 9,113 Commercial paper 33,509 19,359 Corporate obligations 8,994 9,352 U.S. treasury obligations — 13,298 U.S. agency obligations — 21,613 $ 44,326 $ 73,826 Investments classified as long-term consist of the following: March 31, 2019 December 31, 2018 Available-for-sale Group insurance contracts $ 5,950 $ 5,890 Cost method investments: Minority interest in a private company 4,400 4,400 $ 10,350 $ 10,290 The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale As of March 31, 2019: Cost Gross Gross Estimated Short-term investments: Available-for-sale Time deposits and certificates of deposit $ 99 $ 2 $ — $ 101 Bankers’ acceptance drafts 1,722 — — 1,722 Commercial paper 33,752 1 (244 ) 33,509 Corporate obligations 8,996 1 (3 ) 8,994 $ 44,569 $ 4 $ (247 ) $ 44,326 As of March 31, 2019: Cost Gross Gross Estimated Long-term investments: Available-for-sale Group insurance contracts $ 5,582 $ 368 $ — $ 5,950 As of December 31, 2018: Cost Gross Gross Estimated Short-term investments: Available-for-sale Time deposits and certificates of deposit $ 102 $ — $ — $ 102 Bankers’ acceptance drafts 989 — — 989 Asset-backed securities 9,121 1 (9 ) 9,113 Commercial paper 19,504 — (145 ) 19,359 Corporate obligations 9,367 — (15 ) 9,352 U.S. treasury obligations 13,294 4 — 13,298 U.S. agency obligations 21,617 2 (6 ) 21,613 $ 73,994 $ 7 $ (175 ) $ 73,826 As of December 31, 2018: Cost Gross Gross Estimated Long-term investments: Available-for-sale Group insurance contracts $ 5,546 $ 344 $ — $ 5,890 The tables above, which show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale 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, 2019 and December 31, 2018 were temporary. Interest income is accrued as earned. Dividend income is recognized as income on the date the stock trades “ex-dividend.”

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	6) 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, 2019 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description March 31, 2019 Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 294 $ 294 $ — $ — Time deposits and certificates of deposit 3,852 — 3,852 — Commercial paper 82,584 — 82,584 — Corporate obligations 12,570 — 12,570 — U.S. agency obligations 49,084 — 49,084 — Restricted cash – money market funds 317 317 — — Available-for-sale Time deposits and certificates of deposit 101 — 101 — Bankers’ acceptance drafts 1,722 — 1,722 — Commercial paper 33,509 — 33,509 — Corporate obligations 8,994 — 8,994 — Group insurance contracts 5,950 — 5,950 — Derivatives – currency forward contracts 3,492 — 3,492 — Funds in investments and other assets: Israeli pension assets 14,481 — 14,481 — Derivatives – interest rate hedge – non-current 4,459 — 4,459 — Deferred compensation plan assets: Mutual funds and exchange traded funds 1,799 — 1,799 — Money market securities 274 — 274 — Total assets $ 223,482 $ 611 $ 222,871 $ — Liabilities: Derivatives – currency forward contracts $ 322 $ — $ 322 $ — Reported as follows: Assets: Cash and cash equivalents, including restricted cash (1) $ 148,701 $ 611 $ 148,090 $ — Short-term investments 44,326 — 44,326 — Other current assets 3,492 — 3,492 — Total current assets $ 196,519 $ 611 $ 195,908 $ — Long-term investments (2) $ 5,950 $ — $ 5,950 $ — Other assets 21,013 — 21,013 — Total long-term assets $ 26,963 $ — $ 26,963 $ — Liabilities: Other current liabilities $ 322 $ — $ 322 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $269,315 as of March 31, 2019. (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, 2018 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description December 31, 2018 Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 180,340 $ 180,340 $ — $ — Time deposits and certificates of deposit 850 — 850 — Commercial paper 2,687 — 2,687 — U.S. agency obligations 3,418 — 3,418 — Restricted cash – money market funds 110 110 — — Available-for-sale Time deposits and certificates of deposit 102 — 102 — Bankers’ acceptance drafts 989 — 989 — Asset-backed securities 9,113 — 9,113 — Commercial paper 19,359 — 19,359 — Corporate obligations 9,352 — 9,352 — U.S. treasury obligations 13,298 — 13,298 — U.S. agency obligations 21,613 — 21,613 — Group insurance contracts 5,890 — 5,890 — Derivatives – currency forward contracts 2,485 — 2,485 — Funds in investments and other assets: Israeli pension assets 14,408 — 14,408 — Derivatives – interest rate hedge – non-current 6,083 — 6,083 — Total assets $ 290,097 $ 180,450 $ 109,647 $ — Liabilities: Derivatives – currency forward contracts $ 1,168 $ — $ 1,168 $ — Reported as follows: Assets: Cash and cash equivalents, including restricted cash (1) $ 187,405 $ 180,450 $ 6,955 $ — Short-term investments 73,826 — 73,826 — Other current assets 2,485 — 2,485 — Total current assets $ 263,716 $ 180,450 $ 83,266 $ — Long-term investments (2) $ 5,890 $ — $ 5,890 $ — Other assets 20,491 — 20,491 — Total long-term assets $ 26,381 $ — $ 26,381 $ — Liabilities: Other current liabilities $ 1,168 $ — $ 1,168 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $456,940 as of December 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. 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 Available-for-sale The Company measures its debt and equity investments at fair value. The Company’s available-for-sale 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

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	7) 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 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 11. This hedge fixes the interest rate paid on the hedged debt at 1.198% per annum plus the applicable credit spread, which was 2.0% as of March 31, 2019, 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. At March 31, 2019, the notional amount of this transaction was $290,000 and had a fair value of $4,459. At December 31, 2018, the notional amount of this transaction was $290,000 and had a fair value of $6,083. 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 As of March 31, 2019 and December 31, 2018, the Company had outstanding forward foreign exchange contracts with gross notional values of $144,002 and $159,394, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of March 31, 2019 and December 31, 2018: March 31, 2019 Currency Hedged (Buy/Sell) Gross Notional Fair Value (1) U.S. Dollar/Japanese Yen $ 39,022 $ 302 U.S. Dollar/South Korean Won 54,077 1,424 U.S. Dollar/Euro 20,146 916 U.S. Dollar/U.K. Pound Sterling 10,921 125 U.S. Dollar/Taiwan Dollar 19,836 403 Total $ 144,002 $ 3,170 December 31, 2018 Currency Hedged (Buy/Sell) Gross Notional Fair Value (1) U.S. Dollar/Japanese Yen $ 43,770 $ (478 ) U.S. Dollar/South Korean Won 59,149 570 U.S. Dollar/Euro 23,515 688 U.S. Dollar/U.K. Pound Sterling 11,827 323 U.S. Dollar/Taiwan Dollar 21,133 214 Total $ 159,394 $ 1,317 (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, 2019 December 31, 2018 Derivative assets: Foreign exchange contracts (1) $ 3,492 $ 2,485 Foreign currency interest rate hedge (2) 4,459 6,083 Derivative liabilities: Foreign exchange contracts (1) (322 ) (1,168 ) Total net derivative asset designated as hedging instruments $ 7,629 $ 7,400 (1) The derivative assets of $3,492 and $2,485 as of March 31, 2019 and December 31, 2018, respectively, related to foreign exchange contracts and are classified in other current assets in the consolidated balance sheet. The derivative liabilities of $322 and $1,168 as of March 31, 2019 and December 31, 2018, respectively, 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 foreign currency interest rate hedge assets of $4,459 and $6,083 as of March 31, 2019 and December 31, 2018, respectively, are classified in other assets in the consolidated balance sheet. The net amount of existing gains as of March 31, 2019 that the Company expects to reclassify from OCI into earnings within the next twelve months is immaterial. The following table provides a summary of the gains (losses) on derivatives designated as cash flow hedging instruments: Three Months Ended Derivatives Designated as Cash Flow Hedging Instruments 2019 2018 Forward exchange contracts: Net gain recognized in OCI (1) $ 67 $ 66 Net gain (loss) reclassified from accumulated OCI into income (2) $ 949 $ (2,539 ) (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 March 31, 2019 and 2018. The tax effect of the gains or losses reclassified from accumulated OCI into income is immaterial. The following table provides a summary of the gain (loss) on derivatives not designated as hedging instruments: Three Months Ended Derivatives Not Designated as Hedging Instruments 2019 2018 Forward exchange contracts: Net gain (loss) recognized in income (1) $ 57 $ (1,253 ) (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

Inventories	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventories	8) Inventories Inventories consist of the following: March 31, 2019 December 31, 2018 Raw materials $ 303,588 $ 235,593 Work-in-process 76,560 61,908 Finished goods 95,485 87,188 $ 475,633 $ 384,689

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Acquisitions	9) Acquisitions Electro Scientific Industries, Inc. On February 1, 2019, the Company completed its acquisition of Electro Scientific Industries, Inc. (“ESI”) pursuant to an Agreement and Plan of Merger, dated as of October 29, 2018 (the “Merger Agreement”), by and among the Company, EAS Equipment, Inc., formerly a Delaware corporation and a wholly-owned subsidiary of the Company, and ESI (the “ESI Merger”). At the effective time of the ESI Merger and pursuant to the terms and conditions of the Merger Agreement, each share of ESI’s common stock that was issued and outstanding immediately prior to the effective time of the ESI Merger was converted into the right to receive $30.00 in cash, without interest and subject to deduction of any required withholding tax. The aggregate consideration of approximately $1,032,671, excluding related transaction fees and expenses, and non-cash ESI provides laser-based manufacturing solutions for the micro-machining industry that enable customers to optimize production. It’s market is composed primarily of flexible and rigid PCB processing/fabrication, semiconductor wafer processing and passive component manufacturing and testing. ESI solutions incorporate specialized laser technology and proprietary control software to efficiently process the materials and components that are an integral part of electronic devices and systems. The purchase price of ESI consisted of the following: Cash paid for outstanding shares (1) $ 1,032,671 Settlement of share-based compensation awards (2) 30,630 Total purchase price 1,063,301 Less: Cash and cash equivalents acquired (44,072 ) Total purchase price, net of cash and cash equivalents acquired $ 1,019,229 (1) Represents cash paid of $30.00 per share for approximately 34,422,361 shares of ESI common stock, without interest and subject to a deduction for any required withholding tax. (2) Represents the vested but not issued portion of ESI share-based compensation awards as of the acquisition date of February 1, 2019. Under the acquisition method of accounting, the total estimated acquisition consideration is allocated to the acquired tangible and intangible assets and assumed liabilities of ESI based on their fair values as of the acquisition date. Any excess of the acquisition consideration over the fair value of assets acquired and liabilities assumed is allocated to goodwill. The Company expects that none of such goodwill and intangible assets will be deductible for tax purposes. The following table summarizes the allocation of the preliminary purchase price to the fair values assigned to assets acquired and liabilities assumed at the date of the ESI Merger: Current assets (excluding inventory) $ 209,194 Inventory 92,364 Intangible assets 318,600 Goodwill 471,403 Property, plant and equipment 52,891 Long-term assets 9,633 Total assets acquired 1,154,085 Current liabilities 51,479 Non-current 32,146 Other long-term liabilities 7,159 Total liabilities assumed 90,784 Fair value of assets acquired and liabilities assumed 1,063,301 Less: Cash and cash equivalents acquired (44,072 ) Total purchase price, net of cash and cash equivalents acquired $ 1,019,229 The fair value write-up write-up The fair value write-up value-in-use, The acquired intangible assets are being amortized on a straight-line basis, which approximates the economic use of the asset. The following table reflects the allocation of the acquired intangible assets and related estimate of useful lives: Completed technology - Laser $ 257,900 12 years Completed technology - Non-Laser 18,500 10 years Trademarks and trade names 14,400 7 years Customer relationships 25,400 10 years Backlog 2,400 1 year $ 318,600 The net fair value of the acquired intangibles was determined using the income approach. In performing these valuations, the key underlying probability-adjusted assumptions of the discounted cash flows were projected revenues, gross margin expectations and operating cost estimates. The valuations were based on the information that was available as of the acquisition date and the expectations and assumptions that have been deemed reasonable by the Company’s management. There are inherent uncertainties and management judgment required in these determinations. This acquisition resulted in a purchase price that exceeded the estimated fair value of tangible and intangible assets, the excess amount of which was allocated to goodwill. While the Company uses its best estimates and assumptions as part of the purchase price allocation process to value the assets acquired and liabilities assumed on the acquisition date, its estimates and assumptions are subject to refinement. Fair value estimates are based on a complex series of judgments about future events and uncertainties and rely heavily on estimates and assumptions. The judgments used to determine the estimated fair value assigned to each class of assets acquired and liabilities assumed, as well as asset lives, can materially impact the Company’s results of operations. The finalization of the purchase accounting assessment will result in a change in the valuation of assets acquired and liabilities assumed and may have a material impact on the Company’s results of operations and financial position. As a result, during the measurement period, which may be up to one year from the acquisition date, the Company records adjustments to the assets acquired and liabilities assumed with a corresponding offset to goodwill to reflect additional information received about facts and circumstances which existed at the date of acquisition. The Company records adjustments to the assets acquired and liabilities assumed subsequent to the purchase price allocation period in the Company’s operating results in the period in which the adjustments are determined. The size and breadth of the ESI Merger will necessitate the use of this measurement period to adequately analyze and assess a number of the factors used in establishing the fair value of certain tangible and intangible assets acquired and liabilities assumed as of the acquisition date and the related tax impacts of any changes made. Any potential adjustments made could be material in relation to the preliminary values presented above. The Company believes the amount of goodwill relative to identifiable intangible assets relates to several factors including: (1) broadening its position in key industrial end markets to complementary solutions; and (2) leveraging component and systems expertise to provide robust solutions to meet customer evolving technology needs. The results of this acquisition were included in the Company’s consolidated statement of operations beginning on February 1, 2019. ESI constitutes the Company’s Equipment & Solutions reportable segment (see Note 17). Certain executives from ESI had severance provisions in their respective ESI employment agreements. The agreements included terms that were accounted for as dual-trigger arrangements. Through the Company’s acquisition accounting, the expense relating to these benefits was recognized in the combined entity’s financial statements. The Company recorded costs of $2,701 and $14,023 in acquisition and integration costs as compensation expense and stock-based compensation expense, respectively, for the three months ended March 31, 2019 associated with these severance provisions. The restricted stock units and stock appreciation rights that were eligible for accelerated vesting if the executive exercised his or her rights but were not issued as of each reporting period-end, will be excluded from the computation of basic earnings per share and included in the computation of diluted earnings per share for such reporting period. In addition, the Company recorded $6,764 in acquisition and integration costs, which were primarily advisory services costs. The Company’s consolidated net revenue and earnings for the three months ended March 31, 2019 include the following amounts of revenue and earnings of ESI since the acquisition date: Three Months Ended Total net revenues $ 35,218 Net loss $ (31,716 ) Net loss per share: Basic $ (0.59 ) Diluted $ (0.59 ) Pro Forma Results The following unaudited pro forma financial information presents the combined results of operations of the Company as if the ESI Merger had occurred on January 1, 2018. The unaudited pro forma financial information is not necessarily indicative of what the Company’s condensed consolidated results of operations actually would have been had the acquisition occurred at the beginning of each year. In addition, the unaudited pro forma financial information does not attempt to project the future results of operations of the combined Company. Three Months Ended 2019 2018 Total net revenues $ 478,069 $ 660,513 Net income $ 49,135 $ 101,633 Net income per share: Basic $ 0.91 $ 1.87 Diluted $ 0.90 $ 1.84 The unaudited pro forma financial information above gives effect primarily to the following: (1) Incremental amortization and depreciation expense related to the estimated fair value of identifiable intangible assets and property, plant and equipment, respectively from the purchase price allocation. (2) Revenue and cost of goods sold, adjustments as a result of the reduction in deferred revenue and the cost related to their estimated fair value. (3) Incremental interest expense related to the Company’s Incremental Term Loan Facility, as discussed in Note 11. (4) The exclusion of acquisition costs and inventory and demonstration inventory step-up (5) The exclusion of debt issuance costs due to the modification of the Incremental Term Loan Facility from the three month period ended March 31, 2019 and the addition of this item to the three month period ended March 31, 2018. (6) The estimated tax impact of the above adjustments.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	10) 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. Effective July 1, 2018, the Company reassigned goodwill to certain reporting units within the Light & Motion reportable segment resulting from a reorganization of the composition of goodwill reporting units. The goodwill was reassigned to the reporting units affected using the relative fair value approach. In conjunction with this goodwill reassignment, the Company performed an interim quantitative impairment test as of July 1, 2018 for all of its reporting units and concluded that the fair values of each reporting unit exceeded their respective carrying values. Effective January 1, 2019, the Company reassigned goodwill to certain reporting units within the Light & Motion reportable segment resulting from a reorganization of the composition of goodwill reporting units. The goodwill was reassigned to the reporting units affected using the relative fair value approach. The Company also concluded that the fair value of each reporting unit exceeded its respective carrying value. The changes in the carrying amount of goodwill and accumulated impairment loss during the three months ended March 31, 2019 and year ended December 31, 2018 were as follows: Three Months Ended March 31, 2019 Twelve Months Ended December 31, 2018 Gross Accumulated Net Gross Accumulated Net Beginning balance at January 1 $ 731,272 $ (144,276 ) $ 586,996 $ 735,323 $ (144,276 ) $ 591,047 Acquired goodwill (1) 471,403 — 471,403 — — — Foreign currency translation (1,068 ) — (1,068 ) (4,051 ) — (4,051 ) Ending balance at March 31, 2019 and December 31, 2018 $ 1,201,607 $ (144,276 ) $ 1,057,331 $ 731,272 $ (144,276 ) $ 586,996 (1) During the three months ended March 31, 2019, the Company recorded $471,403 of goodwill related to the ESI Merger. Intangible Assets Components of the Company’s intangible assets are comprised of the following: As of March 31, 2019: Gross Accumulated Accumulated Foreign Net Completed technology (1) $ 448,831 $ (105 ) $ (146,614 ) $ (162 ) $ 301,950 Customer relationships (1) 308,144 (1,406 ) (68,738 ) (819 ) 237,181 Patents, trademarks, trade names and other (1) 120,895 — (40,976 ) 41 79,960 $ 877,870 $ (1,511 ) $ (256,328 ) $ (940 ) $ 619,091 (1) During the three months ended March 31, 2019, the Company recorded $318,600 of separately identified intangible assets related to the ESI Merger, of which $276,400 was completed technology, $25,400 was customer relationships and $16,800 was trademarks, trade names and backlog. Separately, on January 1, 2019, the Company reclassified $6,428 of gross favorable lease assets and $3,445 of related accumulated amortization from patents, trademarks, trade names and other to the right-of-use As of December 31, 2018: Gross Impairment Accumulated Foreign Net Completed technology $ 172,431 $ (105 ) $ (137,283 ) $ (73 ) $ 34,970 Customer relationships 282,744 (1,406 ) (63,788 ) (269 ) 217,281 Patents, trademarks, trade names and other 110,523 — (42,954 ) (13 ) 67,556 $ 565,698 $ (1,511 ) $ (244,025 ) $ (355 ) $ 319,807 Aggregate amortization expense related to acquired intangibles for the three months ended March 31, 2019 and 2018 was $15,727 and $11,190, respectively. The net amortization expense from favorable lease commitments for the three months ended March 31, 2019 and 2018 was net of $0 and $407, respectively. Aggregate net amortization expense related to acquired intangible assets for future years is as follows: Year Amount 2019 (remaining) $ 51,638 2020 55,751 2021 47,958 2022 45,480 2023 45,121 2024 44,204 Thereafter 273,039

Debt

Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt	11) Debt Term Loan Credit Agreement In connection with the completion of the acquisition of Newport Corporation in 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 in the original principal amount of $780,000 (the “2016 Term Loan Facility”), subject to increase at the Company’s option and subject to receipt of lender commitments in accordance with the Credit Agreement (the 2016 Term Loan Facility, together with the 2019 Incremental Term Loan Facility (as defined below), “Term Loan Facility”). The 2016 Term Loan Facility matures on April 29, 2023. 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, unless an alternate rate of interest is agreed, 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 2016 Term Loan Facility was issued with original issue discount of 1.00% of the principal amount thereof. The Company subsequently entered into four separate repricing amendments to the 2016 Term Loan Facility, which decreased the applicable margin for LIBOR borrowings from 4.0% to 1.75%, with a LIBOR rate floor of 0.75%. As a consequence of the pricing of the 2019 Incremental Term Loan Facility (defined below), the applicable margin for the 2016 Term Loan Facility was increased to 2.00% (from 1.75%) with respect to LIBOR borrowings and 1.00% (from 0.75%) with respect to base rate borrowings. The interest rate on the 2016 Term Loan Facility as of March 31, 2019 was 4.5%. 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 2016 Term Loan Facility. The rate is fixed at 1.198% per annum plus the applicable credit spread, which was 2.0% at March 31, 2019. At March 31, 2019, the notional amount of this transaction was $290,000 and had a fair value of $4,459. As of March 31, 2019, after total principal prepayments of $425,000 and regularly scheduled principal payments of $6,536, the total outstanding principal balance of the 2016 Term Loan Facility was $348,464. As a result of making these prepayments, the Company is no longer required to make any regularly scheduled principal payments on the 2016 Term Loan Facility until the maturity date of the loan. The Company incurred $28,747 of deferred finance fees, original issue discount and repricing fees related to the term loans under the 2016 Term Loan Facility, which are 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 have been accelerated in connection with the various debt prepayments during 2016, 2017 and 2018. As of March 31, 2019, the remaining balance of the deferred finance fees, original issue discount and repricing fees related to the 2016 Term Loan Facility was $3,980. On February 1, 2019, in connection with the completion of the ESI Merger, the Company entered into an amendment (“Amendment No. 5”) to the Credit Agreement. Amendment No. 5 provided an additional tranche B-5 The Company incurred $11,362 of deferred finance fees and original issue discount fees related to the term loans under the 2019 Incremental Term Loan Facility, which are 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. As of March 31, 2019, the remaining balance of the deferred finance fees and original issue discount related to the 2019 Incremental Term Loan Facility was $11,244. The Company is required to make scheduled quarterly payments each equal to 0.25% of the original principal amount of the 2019 Incremental Term Loan Facility, with the balance due on February 1, 2026. If on or prior to the date that is six months after the closing date of Amendment No. 5, the Company prepays any loans under the 2019 Incremental Term Loan Facility in connection with a repricing transaction, the Company must pay a prepayment premium of 1.00% of the aggregate principal amount of the loans so prepaid. At March 31, 2019, the total balance outstanding of the 2019 Incremental Term Loan Facility was $650,000 and the interest rate was 4.7%. Under the Credit Agreement, the Company is required to prepay outstanding term loans under the 2016 Term Loan Facility and the 2019 Incremental Term Loan Facility, 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. As a result the Company’s Total Leverage Ratio, it was not required to make a prepayment of excess cash flow for the fiscal year ended December 31, 2018. 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, 2019, 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 in April 2016, the Company 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, that provided senior secured financing of up to $50,000, which the Company never borrowed against. On February 1, 2019, in connection with the completion of the ESI Merger, the Company terminated the $50,000 asset-based credit agreement with Deutsche Bank AG New York Branch and entered into an asset-based credit agreement with Barclays Bank PLC, 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 Credit Agreement”), that provides senior secured revolving credit financing of up to $100,000, subject to a borrowing base limitation (the “ABL Facility”). The borrowing base for the ABL Facility at any time equals the sum of: (a) 85% of certain eligible accounts; plus (b) prior to certain notice and filed examination and appraisal requirements, the lesser of (i) 20% of net book value of eligible inventory in the United States and (ii) 30% of the borrowing base, and after the satisfaction of such 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. The ABL Facility includes borrowing capacity in the form of letters of credit up to $25,000. Borrowings under the ABL Facility bear interest at a rate per annum equal to, at the Company’s option, any of the following, plus, in each case, an applicable margin: (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 0.00%; 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, with a floor of 0.00%. The initial applicable margin for borrowings under the ABL Facility is 0.50% with respect to base rate borrowings and 1.50% with respect to LIBOR borrowings. 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. In addition to paying interest on any outstanding principal under the ABL Facility, the Company is required to pay a commitment fee in respect of the unutilized commitments thereunder equal to 0.25% per annum. The Company must also pay customary letter of credit fees and agency fees. The Company incurred $785 of costs in connection with the new ABL Facility, which were capitalized and included in other assets in the accompanying consolidated balance sheet and are being amortized to interest expense over the contractual term of five years of the ABL Facility. As a result of the prior asset-based facility being terminated, the Company wrote off $216 of previously capitalized debt issuance costs. The ABL Credit Agreement also contains customary representations and warranties, affirmative covenants and provisions relating to events of default. If an event of default occurs, the lenders under the ABL Facility will be entitled to take various actions, including the acceleration of amounts due under the ABL Facility and all actions permitted to be taken by a secured creditor. 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, 2019 of up to an equivalent of $20,747. One of the borrowing arrangements has an interest rate based on the Tokyo Interbank Offer Rate at the time of borrowing and the other has an interest rate based on the Japanese Short-Term Prime Lending Rate. There were no borrowings outstanding under these arrangements at March 31, 2019 and December 31, 2018, respectively. The Company has various revolving lines of credit and a financing facility. These revolving lines of credit and financing facility have no expiration date and as of March 31, 2019, provided for aggregate borrowings of up to an equivalent of $11,275. 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 $3,195 and $3,389 at March 31, 2019 and December 31, 2018, respectively. 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% to 0.75%. March 31, 2019 December 31, 2018 Short-term debt: Japanese lines of credit $ 2,175 $ 2,724 Japanese receivables financing facility 1,020 665 Austrian loans due through March 2020 586 597 Term Loan Facility 6,500 — $ 10,281 $ 3,986 March 31, 2019 December 31, 2018 Long-term debt: Austrian loans due through March 2020 and other debt $ 83 $ 86 Term Loan Facility, net (1) 976,740 343,756 $ 976,823 $ 343,842 (1) Net of deferred financing fees, original issuance discount and repricing fee of $15,224 and $4,708 as of March 31, 2019 and December 31, 2018, respectively. The Company recognized interest expense of $9,119 and $5,430 for the three months ended March 31, 2019 and 2018, respectively. Contractual maturities of the Company’s debt obligations as of March 31, 2019 are as follows: Year Amount 2019 (remaining $ 8,656 2020 6,583 2021 6,500 2022 6,500 2023 354,964 2024 6,500 Thereafter 612,625

Product Warranties

Product Warranties	3 Months Ended
	Mar. 31, 2019
Guarantees and Product Warranties [Abstract]
Product Warranties	12) Product Warranties The Company records the estimated costs to fulfill customer warranty obligations upon the recognition of the related revenue. While the Company engages in extensive product quality programs and processes, including actively monitoring and evaluating the quality of its component suppliers, the Company’s warranty obligation is affected by shipment volume, product failure rates, utilization levels, material usage, and supplier warranties on parts delivered to the Company. Should actual product failure rates, utilization levels, material usage, or supplier warranties on parts differ from the Company’s estimates, revisions to the estimated warranty liability would be required. Product warranty activities were as follows: Three Months Ended March 31, 2019 2018 Beginning of period $ 10,399 $ 10,104 Assumed product warranty liability from ESI Merger 7,177 — Provision for product warranties 6,062 5,184 Direct and other charges to warranty liability (6,705 ) (4,073 ) End of period (1) $ 16,933 $ 11,215 (1) As of March 31, 2019, short-term product warranty of $13,843 and long-term product warranty of $3,090 were included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet. As of March 31, 2018, short-term product warranty of $10,856 and long-term product warranty of $359 were 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, 2019
Income Tax Disclosure [Abstract]
Income Taxes	13) Income Taxes The Company’s effective tax rates for the three months ended March 31, 2019 and 2018 were 18.8% and 17.1%, respectively. The effective tax rate for the three months ended March 31, 2019 and the related income tax expense were lower than the U.S. statutory tax rate due to the U.S. deduction for foreign derived intangible income, the federal tax credit for research activities and the geographic mix of income earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory tax rate, offset by the global intangible low-taxed The Company’s effective tax rate for the three months ended March 31, 2018 and the related income tax expense were 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 deduction for foreign derived intangible income offset by the tax effects from global intangible low-taxed As of March 31, 2019, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $40,725. At December 31, 2018, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $32,684. The net increase was primarily attributable to the addition of historical gross unrecognized tax benefits for ESI as a result of the ESI Merger during the quarter ended March 31, 2019. As of March 31, 2019, excluding interest and penalties, there were approximately $33,085 of net unrecognized tax benefits that, if recognized, 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, 2019 and December 31, 2018, the Company had accrued interest on unrecognized tax benefits of approximately $543 and $568, respectively. Over the next 12 months it is reasonably possible that the Company may recognize approximately $1,452 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 U.S. 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 ended March 31, 2018, the Company received notification from the U.S. Internal Revenue Service of their intent to audit its U.S. subsidiary, Newport Corporation, for tax year 2015. This audit commenced during the quarter ended June 30, 2018 and there have been no proposed adjustments through March 31, 2019. The U.S. statute of limitations remains open for tax years 2015 through present. The statute of limitations for the Company’s tax filings in other jurisdictions varies between fiscal years 2013 through present. The Company also has 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.

Net Income Per Share

Net Income Per Share	3 Months Ended
	Mar. 31, 2019
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, 2019 2018 Numerator: Net income $ 12,455 $ 105,121 Denominator: Shares used in net income per common share – basic 54,147,000 54,423,000 Effect of dilutive securities: Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 701,000 863,000 Shares used in net income per common share – diluted 54,848,000 55,286,000 Net income per common share: Basic $ 0.23 $ 1.93 Diluted $ 0.23 $ 1.90 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, 2019 and 2018 there were approximately 128,200 and 380 weighted-average restricted stock units, respectively, that would have had an anti-dilutive effect on EPS, and would thus need to be excluded from the computation of diluted weighted-average shares.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	15) Stock-Based Compensation The Company grants restricted stock units (“RSUs”) to employees and directors under the 2014 Stock Incentive Plan (the “2014 Plan”). The 2014 Plan is administered by the Compensation Committee of the Company’s Board of Directors. The 2014 Plan is intended to attract and retain employees and directors, and to provide an incentive for these individuals to assist the Company to achieve long-range performance goals and to enable these individuals to participate in the long-term growth of the Company. In connection with the completion of the ESI Merger, the Company assumed: • all RSUs that vest based solely on the satisfaction of service conditions, granted under any ESI equity plan, arrangement or agreement (“ESI Plan”) that were outstanding immediately prior to the effective time of the ESI Merger, and as to which shares of ESI common stock were not fully distributed in connection with the closing of the ESI Merger, • all RSUs that were granted subject to vesting based on both the achievement of performance goals and the satisfaction of service conditions granted under any ESI Plan that were outstanding immediately prior to the effective time of the ESI Merger, and • all stock appreciation rights (“SARs”) granted under any ESI Plan, whether vested or unvested, that were outstanding immediately prior to the effective time of the ESI Merger and held by an individual who was a service provider of ESI as of the date on which the effective time of the ESI Merger occurred. As of the effective time of the ESI Merger, based on a formula in the Merger Agreement, (a) such RSUs were converted automatically into RSUs with respect to 736,133 shares of the Company’s common stock (the “Assumed RSUs”), and (b) all SARs were converted automatically into SARs with respect to 12,787 shares of the Company’s common stock (the “Assumed SARs”). Included in the total number of assumed RSUs are 326,283 shares of the Company’s common stock for employees and outside directors that are part of the ESI Deferred Compensation plan. These shares will not become issued shares until their respective release dates. The shares of the Company’s common stock that are subject to the Assumed SARs and the Assumed RSUs are issuable pursuant to the Company’s 2014 Plan. The 748,920 shares of the Company’s common stock that are issuable pursuant to the Assumed RSUs and the Assumed SARs under the Company’s 2014 Plan were registered under the Securities Act of 1933 on the Registration Statement on Form S-8. S-8. During the three months ended March 31, 2019, the Company granted 182,212 RSUs with a weighted average grant date fair value of $82.58. 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. There were no SARs granted during the three months ended March 31, 2019 or 2018. The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows: Three Months Ended March 31, 2019 2018 Cost of revenues $ 422 $ 1,005 Research and development expense 810 722 Selling, general and administrative expense 8,038 8,699 Acquisition and integration related expense 18,568 — Total pre-tax $ 27,838 $ 10,426 At March 31, 2019, the total compensation expense related to unvested stock-based awards granted to employees and directors under the 2014 Plan that had not been recognized was $31,356, net of estimated forfeitures. The future compensation expense for time-based awards is recognized on a straight-line basis and the future compensation expense for performance-based awards is recognized using the accelerated graded vesting method, both of which expense over the requisite service period, net of estimated forfeitures, except for retirement eligible employees, in which case 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, 2019 Outstanding RSUs Weighted Average RSUs – beginning of period 647,394 $ 74.04 Assumed shares from ESI Merger 736,133 $ 84.10 Accrued dividend shares 1,558 $ 78.45 Granted 182,212 $ 82.58 Vested (274,898 ) $ 67.57 Forfeited (76,096 ) $ 91.14 RSUs – end of period 1,216,303 $ 81.81 The following table presents the activity for SARs under the Plan: Three Months Ended March 31, 2019 Outstanding SARs Weighted Average SARs – beginning of period 177,538 $ 28.52 Assumed SARs from ESI Merger 12,787 $ 17.38 Exercised (23,569 ) $ 27.34 Forfeited or expired (184 ) $ 27.89 SARs Outstanding – end of period 166,572 $ 27.86

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2019
Federal Home Loan Banks [Abstract]
Stockholders' Equity	16) 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 2,588,000 shares of common stock for approximately $127,000 pursuant to the program since its adoption. During the three months ended March 31, 2019 and 2018, there were no repurchases of common stock. Cash Dividends Holders of the Company’s common stock are entitled to receive dividends when they are declared by the Company’s Board of Directors. In addition, the Company accrues dividend equivalents on the RSUs the Company assumed in the ESI Merger described in Note 15 above when dividends are declared by the Company’s Board of Directors. During the three months ended March 31, 2019, the Company’s Board of Directors declared a quarterly cash dividend of $0.20 per share, which totaled $10,843. During the three months ended March 31, 2018, the Company’s Board of Directors declared a quarterly cash dividend of $0.18 per share, which totaled $9,808. On May 8, 2019, the Company’s Board of Directors declared a quarterly cash dividend of $0.20 per share to be paid on June 7, 2019 to shareholders of record as of May 27, 2019. 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 Term Loan Facility and its ABL Facility, the Company may be restricted from paying dividends under certain circumstances.

Business Segment, Geographic Ar

Business Segment, Geographic Area, Product and Significant Customer Information	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Business Segment, Geographic Area, Product and Significant Customer Information	17) Business Segment, Geographic Area, Product and Significant Customer Information The Company is a global provider of instruments, subsystems and process control solutions that measure, monitor, deliver, analyze, power and control critical parameters of advanced manufacturing processes to improve process performance and productivity for its customers. The Company’s products are derived from its core competencies in pressure measurement and control, flow measurement and control, gas and vapor delivery, gas composition analysis, residual gas analysis, leak detection, control technology, ozone generation and delivery, power, reactive gas generation, vacuum technology, lasers, photonics, sub-micron positioning, vibration control, optics and laser-based manufacturing solutions. The Company also provides services relating to the maintenance and repair of its products, installation services and training. The Company’s primary served markets include semiconductor, industrial technologies, life and health sciences, research and defense. The Company’s Chief Operating Decision Maker (“CODM”) utilizes financial information to make decisions about allocating resources and assessing performance for the entire Company, which is used in the decision making process to assess performance. Effective February 1, 2019, in conjunction with its acquisition of ESI, the Company created a third reportable segment known as the Equipment & Solutions segment in addition to its existing two reportable segments: the Vacuum & Analysis segment and the Light & Motion segment. 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 The Equipment & Solutions segment provides laser-based manufacturing solutions for the micro-machining industry that enable customers to optimize production. The segment’s market is composed primarily of flexible and rigid PCB processing/fabrication, semiconductor wafer processing and passive component manufacturing & test. Equipment & Solutions incorporate specialized laser technology and proprietary control software to efficiently process the materials and components that are an integral part of electronic devices and systems. 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 table sets forth net revenues by reportable segment: Three Months Ended March 31, 2019 2018 Vacuum & Analysis $ 234,355 $ 348,344 Light & Motion 193,988 205,931 Equipment & Solutions 35,218 — $ 463,561 $ 554,275 The following table sets forth a reconciliation of segment gross profit to consolidated net income: Three Months Ended March 31, 2019 2018 Gross profit by reportable segment: Vacuum & Analysis $ 98,139 $ 158,500 Light & Motion 92,741 104,355 Equipment & Solutions 7,238 — Total gross profit by reportable segment 198,118 262,855 Operating expenses: Research and development 38,933 34,857 Selling, general and administrative 82,455 82,949 Fees and expenses related to incremental term loan 5,847 — Acquisition and integration costs 30,167 — Restructuring 223 1,220 Customer contract obligation 1,700 — Environmental costs — 1,000 Amortization of intangible assets 15,727 11,190 Income from operations 23,066 131,639 Interest and other expense, net 7,730 4,897 Income before income taxes 15,336 126,742 Provision for income taxes 2,881 21,621 Net income $ 12,455 $ 105,121 The following table sets forth capital expenditures by reportable segment for the three months ended March 31, 2019 and 2018: Vacuum & Analysis Light & Motion Equipment & Total Three Months Ended March 31, 2019: Capital expenditures $ 7,488 $ 5,154 $ 1,887 $ 14,529 Three Months Ended March 31, 2018: Capital expenditures $ 6,197 $ 3,193 $ — $ 9,390 The following table sets forth depreciation and amortization by reportable segment for the three months ended March 31, 2019 and 2018: Vacuum & Analysis Light & Motion Equipment & Total Three Months Ended March 31, 2019: Depreciation and amortization $ 4,045 $ 14,140 $ 7,026 $ 25,211 Three Months Ended March 31, 2018 Depreciation and amortization $ 5,129 $ 15,363 $ — $ 20,492 Total income tax expense is not presented by reportable segment because the necessary information is not available or used by the CODM. The following table sets forth segment assets by reportable segment: March 31, 2019: Vacuum & Analysis Light & Motion Equipment Corporate, Total Segment assets: Accounts receivable $ 160,040 $ 139,592 $ 51,088 $ (14,730 ) $ 335,990 Inventory, net 225,431 164,603 85,690 (91 ) 475,633 Total segment assets $ 385,471 $ 304,195 $ 136,778 $ (14,821 ) $ 811,623 December 31, 2018: Vacuum & Analysis Light & Motion Equipment Corporate, Total Segment assets: Accounts receivable $ 171,604 $ 140,658 $ — $ (16,808 ) $ 295,454 Inventory, net 222,965 161,658 — 66 384,689 Total segment assets $ 394,569 $ 302,316 $ — $ (16,742 ) $ 680,143 The following is a reconciliation of segment assets to consolidated total assets: March 31, 2019 December 31, 2018 Total segment assets $ 811,623 $ 680,143 Cash and cash equivalents and investments 472,692 728,461 Other current assets 86,387 65,790 Property, plant and equipment, net 251,424 194,367 Right-of-use 65,628 — Goodwill and intangible assets, net 1,676,422 906,803 Other assets 48,562 38,682 Consolidated total assets $ 3,412,738 $ 2,614,246 Geographic Information about the Company’s operations in different geographic regions is presented in the tables below. Net revenues to unaffiliated customers are based on the location in which the sale originated. Transfers between geographic areas are at tax transfer prices and have been eliminated from consolidated net revenues. Three Months Ended March 31, 2019 2018 Net revenues: United States $ 224,347 $ 276,720 Korea 35,802 54,011 Japan 42,102 58,274 Asia (excluding Korea and Japan) 101,327 101,384 Europe 59,983 63,886 $ 463,561 $ 554,275 March 31, 2019 December 31, 2018 Long-lived assets: (1) United States $ 198,747 $ 146,687 Europe 29,983 26,794 Asia 57,523 50,572 $ 286,253 $ 224,053 (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, 2019 December 31, 2018 Reportable segment: Vacuum & Analysis $ 196,937 $ 197,126 Light & Motion 388,896 389,870 Equipment & Solutions 471,498 — Total goodwill $ 1,057,331 $ 586,996 Worldwide Product Information The Company groups its product offerings into three groups based upon the similarity of product function as follows: Three Months Ended March 31, 2019 2018 Advanced Manufacturing Components $ 371,345 $ 496,677 Global Service 66,198 57,598 Advanced Manufacturing Systems 26,018 — $ 463,561 $ 554,275 Advanced manufacturing components are comprised of product revenues from the Company’s Vacuum & Analysis and Light & Motion segments. Global service is comprised of total service revenues for all three of the Company’s reportable segments. Advanced manufacturing systems is comprised of product revenues for the Company’s Equipment & Solutions segment.

Restructuring

Restructuring	3 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Restructuring	18) Restructuring The Company recorded restructuring charges of $223 during the three months ended March 31, 2019, primarily related to severance costs related to the consolidation of certain functions in Asia. The Company recorded restructuring charges of $1,220 during the three months ended March 31, 2018 primarily related to severance costs related to streamlining and consolidating certain administrative functions. Restructuring activities were as follows: Three Months Ended March 31, 2019 2018 Beginning of period $ 2,632 $ 3,244 Charged to expense 223 1,220 Payments and adjustments (252 ) (1,806 ) End of period $ 2,603 $ 2,658

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	19) Commitments and Contingencies Newport Litigation In March 2016, two putative class actions lawsuit captioned Dixon Chung v. Newport Corp., et al., Case No. A-16-733154-C, A-16-734039-B, On October 19, 2016, plaintiffs in the consolidated action filed an amended complaint captioned In re Newport Corporation Shareholder Litigation, Case No. A-16-733154-B, pre- On July 27, 2017, plaintiffs filed a second amended complaint containing substantially similar allegations but naming only Newport’s former directors as defendants. On August 8, 2017, the Court dismissed the Company and Newport from the action. The second amended complaint seeks monetary damages, including pre- ESI Litigation On November 29, 2018, a complaint captioned Brian Morris et. al. v. Electro Scientific Industries, Inc. et al. was filed in the U.S. District Court for the District of Oregon by alleged former stockholders of ESI in connection with the ESI Merger. The complaint named the Company’s subsidiary, ESI, and the former members of ESI’s board of directors as defendants. Five additional complaints were subsequently filed, two in the U.S. District Court for the District of Oregon and three in the Multnomah County Circuit Court in the State of Oregon. The cases filed in the U.S. District Court were dated December 6, 2018 and December 12, 2018 and captioned Melvyn Klein et. al. v. Electro Scientific Industries, Inc. et al. and Donald Mager et. al. v. Electro Scientific Industries, Inc. et al., respectively. The complaints filed in Multnomah County Circuit Court were dated December 5, 2018, December 5, 2018 and December 13, 2018 and captioned Michael Kent et. al v. Electro Scientific Industries, Inc. et al., Christopher Stanley et. al v. Electro Scientific Industries, Inc. et al. and Eduardo Colmenares et. al. v. Electro Scientific Industries, Inc., MKS Instruments, Inc., et al., respectively (collectively with Brian Morris et. al. v. Electro Scientific Industries, Inc. et. al., the “Lawsuits”). The Lawsuits are purported class actions brought on behalf of former ESI stockholders, asserting various claims against the former members of the ESI board of directors, ESI, the Company and the Company’s merger subsidiary, including breach of fiduciary duty and aiding and abetting the breach of fiduciary duty. The Lawsuits allege that the consideration paid to the ESI shareholders did not appropriately value ESI, and that merger related disclosures failed to disclose certain material information regarding the merger. The Lawsuits purported to seek unspecified damages. On February 26, 2019, the parties entered into a settlement agreement, pursuant to which plaintiffs dismissed their individual claims with prejudice and class claims without prejudice in return for ESI’s previous supplemental merger related disclosures in connection with the transaction. ESI provided supplemental merger related disclosures to eliminate the burden and expense of litigation and to avoid any possible disruption to the merger that could result from further litigation. 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 our results of operations, financial condition or cash flows.

Recently Issued Accounting Pr_2

Recently Issued Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Changes and Error Corrections [Abstract]
Recently Issued Accounting Pronouncements	In October 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2018-16, In August 2018, the FASB issued ASU 2018-15, Other-Internal-Use 350-40): internal-use internal-use In August 2017, the FASB issued ASU 2017-12, In February 2016, the FASB issued ASU 2016-02, 2016-02 2016-02 right-of-use right-of-use re-classified right-of-use

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Text Block [Abstract]
Schedule Of Elements Of Lease Payments	The elements of lease expense were as follows: Three Months Ended March 31, 2019 Lease Cost: Operating lease cost $ 5,377 Other Information: Operating cash flows used for operating leases $ 5,711 Weighted average discount rate 3.81 % Weighted average remaining lease term 4.9 years
Future Lease Payment Under Non-Cancelable Lease	Future lease payments under non-cancelable 2019 (remaining) $ 16,831 2020 18,608 2021 12,687 2022 7,518 2023 6,315 Thereafter 13,761 Total lease payments 75,720 Less: imputed interest 6,869 Total operating lease liabilities $ 68,851
Minimum Lease Payments under Operating Lease	Minimum lease payments under operating leases prior to adoption of ASU 2016-02 Year Ending December 31, Operating Leases 2019 $ 20,106 2020 17,142 2021 10,325 2022 5,573 2023 4,411 Thereafter 8,739 Total minimum lease payments $ 66,296

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Schedule of Deferred Revenue and Customer Advances by Arrangement	A rollforward of the Company’s deferred revenue and customer advances is as follows: Three Months Ended Beginning balance, January 1 (1) $ 17,474 Deferred revenue and customer advances assumed in ESI Merger 3,314 Additions to deferred revenue and customer advances 17,219 Amount of deferred revenue and customer advances recognized in income (13,933 ) Ending balance, March 31 (2) $ 24,074 (1) Beginning deferred revenue and customer advances as of January 1, 2019 included $8,134 of current deferred revenue, $3,228 of long-term deferred revenue and $6,112 of current customer advances. (2) Ending deferred revenue as of March 31, 2019 included $13,322 of current deferred revenue, $3,018 of long-term deferred revenue and $7,734 of current customer advances.
Summary of Revenue from Contracts with Customers	The following table summarizes revenue from contracts with customers: Three Months Ended March 31, 2019 Vacuum & Light & Equipment & Total Net revenues: Products $ 192,648 $ 178,697 $ 26,018 $ 397,363 Services 41,707 15,291 9,200 66,198 Total net revenues $ 234,355 $ 193,988 $ 35,218 $ 463,561 Three Months Ended March 31, 2018 Vacuum & Light & Equipment & 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

Investments (Tables)

Investments (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 December 31, 2018 Available-for-sale Time deposits and certificates of deposit $ 101 $ 102 Bankers’ acceptance drafts 1,722 989 Asset-backed securities — 9,113 Commercial paper 33,509 19,359 Corporate obligations 8,994 9,352 U.S. treasury obligations — 13,298 U.S. agency obligations — 21,613 $ 44,326 $ 73,826 Investments classified as long-term consist of the following: March 31, 2019 December 31, 2018 Available-for-sale Group insurance contracts $ 5,950 $ 5,890 Cost method investments: Minority interest in a private company 4,400 4,400 $ 10,350 $ 10,290
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 As of March 31, 2019: Cost Gross Gross Estimated Short-term investments: Available-for-sale Time deposits and certificates of deposit $ 99 $ 2 $ — $ 101 Bankers’ acceptance drafts 1,722 — — 1,722 Commercial paper 33,752 1 (244 ) 33,509 Corporate obligations 8,996 1 (3 ) 8,994 $ 44,569 $ 4 $ (247 ) $ 44,326 As of March 31, 2019: Cost Gross Gross Estimated Long-term investments: Available-for-sale Group insurance contracts $ 5,582 $ 368 $ — $ 5,950 As of December 31, 2018: Cost Gross Gross Estimated Short-term investments: Available-for-sale Time deposits and certificates of deposit $ 102 $ — $ — $ 102 Bankers’ acceptance drafts 989 — — 989 Asset-backed securities 9,121 1 (9 ) 9,113 Commercial paper 19,504 — (145 ) 19,359 Corporate obligations 9,367 — (15 ) 9,352 U.S. treasury obligations 13,294 4 — 13,298 U.S. agency obligations 21,617 2 (6 ) 21,613 $ 73,994 $ 7 $ (175 ) $ 73,826 As of December 31, 2018: Cost Gross Gross Estimated Long-term investments: Available-for-sale Group insurance contracts $ 5,546 $ 344 $ — $ 5,890

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description March 31, 2019 Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 294 $ 294 $ — $ — Time deposits and certificates of deposit 3,852 — 3,852 — Commercial paper 82,584 — 82,584 — Corporate obligations 12,570 — 12,570 — U.S. agency obligations 49,084 — 49,084 — Restricted cash – money market funds 317 317 — — Available-for-sale Time deposits and certificates of deposit 101 — 101 — Bankers’ acceptance drafts 1,722 — 1,722 — Commercial paper 33,509 — 33,509 — Corporate obligations 8,994 — 8,994 — Group insurance contracts 5,950 — 5,950 — Derivatives – currency forward contracts 3,492 — 3,492 — Funds in investments and other assets: Israeli pension assets 14,481 — 14,481 — Derivatives – interest rate hedge – non-current 4,459 — 4,459 — Deferred compensation plan assets: Mutual funds and exchange traded funds 1,799 — 1,799 — Money market securities 274 — 274 — Total assets $ 223,482 $ 611 $ 222,871 $ — Liabilities: Derivatives – currency forward contracts $ 322 $ — $ 322 $ — Reported as follows: Assets: Cash and cash equivalents, including restricted cash (1) $ 148,701 $ 611 $ 148,090 $ — Short-term investments 44,326 — 44,326 — Other current assets 3,492 — 3,492 — Total current assets $ 196,519 $ 611 $ 195,908 $ — Long-term investments (2) $ 5,950 $ — $ 5,950 $ — Other assets 21,013 — 21,013 — Total long-term assets $ 26,963 $ — $ 26,963 $ — Liabilities: Other current liabilities $ 322 $ — $ 322 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $269,315 as of March 31, 2019. (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, 2018 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description December 31, 2018 Quoted Prices in Significant Significant Assets: Cash equivalents: Money market funds $ 180,340 $ 180,340 $ — $ — Time deposits and certificates of deposit 850 — 850 — Commercial paper 2,687 — 2,687 — U.S. agency obligations 3,418 — 3,418 — Restricted cash – money market funds 110 110 — — Available-for-sale Time deposits and certificates of deposit 102 — 102 — Bankers’ acceptance drafts 989 — 989 — Asset-backed securities 9,113 — 9,113 — Commercial paper 19,359 — 19,359 — Corporate obligations 9,352 — 9,352 — U.S. treasury obligations 13,298 — 13,298 — U.S. agency obligations 21,613 — 21,613 — Group insurance contracts 5,890 — 5,890 — Derivatives – currency forward contracts 2,485 — 2,485 — Funds in investments and other assets: Israeli pension assets 14,408 — 14,408 — Derivatives – interest rate hedge – non-current 6,083 — 6,083 — Total assets $ 290,097 $ 180,450 $ 109,647 $ — Liabilities: Derivatives – currency forward contracts $ 1,168 $ — $ 1,168 $ — Reported as follows: Assets: Cash and cash equivalents, including restricted cash (1) $ 187,405 $ 180,450 $ 6,955 $ — Short-term investments 73,826 — 73,826 — Other current assets 2,485 — 2,485 — Total current assets $ 263,716 $ 180,450 $ 83,266 $ — Long-term investments (2) $ 5,890 $ — $ 5,890 $ — Other assets 20,491 — 20,491 — Total long-term assets $ 26,381 $ — $ 26,381 $ — Liabilities: Other current liabilities $ 1,168 $ — $ 1,168 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $456,940 as of December 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.

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 and December 31, 2018: March 31, 2019 Currency Hedged (Buy/Sell) Gross Notional Fair Value (1) U.S. Dollar/Japanese Yen $ 39,022 $ 302 U.S. Dollar/South Korean Won 54,077 1,424 U.S. Dollar/Euro 20,146 916 U.S. Dollar/U.K. Pound Sterling 10,921 125 U.S. Dollar/Taiwan Dollar 19,836 403 Total $ 144,002 $ 3,170 December 31, 2018 Currency Hedged (Buy/Sell) Gross Notional Fair Value (1) U.S. Dollar/Japanese Yen $ 43,770 $ (478 ) U.S. Dollar/South Korean Won 59,149 570 U.S. Dollar/Euro 23,515 688 U.S. Dollar/U.K. Pound Sterling 11,827 323 U.S. Dollar/Taiwan Dollar 21,133 214 Total $ 159,394 $ 1,317 (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, 2019 December 31, 2018 Derivative assets: Foreign exchange contracts (1) $ 3,492 $ 2,485 Foreign currency interest rate hedge (2) 4,459 6,083 Derivative liabilities: Foreign exchange contracts (1) (322 ) (1,168 ) Total net derivative asset designated as hedging instruments $ 7,629 $ 7,400 (1) The derivative assets of $3,492 and $2,485 as of March 31, 2019 and December 31, 2018, respectively, related to foreign exchange contracts and are classified in other current assets in the consolidated balance sheet. The derivative liabilities of $322 and $1,168 as of March 31, 2019 and December 31, 2018, respectively, 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 foreign currency interest rate hedge assets of $4,459 and $6,083 as of March 31, 2019 and December 31, 2018, respectively, are classified in other assets in the consolidated balance sheet.
Summary of Gains (Losses) on Derivatives Designated as Cash Flow Hedging Instruments	The following table provides a summary of the gains (losses) on derivatives designated as cash flow hedging instruments: Three Months Ended Derivatives Designated as Cash Flow Hedging Instruments 2019 2018 Forward exchange contracts: Net gain recognized in OCI (1) $ 67 $ 66 Net gain (loss) reclassified from accumulated OCI into income (2) $ 949 $ (2,539 ) (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 March 31, 2019 and 2018. 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 gain (loss) on derivatives not designated as hedging instruments: Three Months Ended Derivatives Not Designated as Hedging Instruments 2019 2018 Forward exchange contracts: Net gain (loss) recognized in income (1) $ 57 $ (1,253 ) (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 (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consist of the following: March 31, 2019 December 31, 2018 Raw materials $ 303,588 $ 235,593 Work-in-process 76,560 61,908 Finished goods 95,485 87,188 $ 475,633 $ 384,689

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2019
Electro Scientific Industries Inc [Member]
Summary of Purchase Price	The purchase price of ESI consisted of the following: Cash paid for outstanding shares (1) $ 1,032,671 Settlement of share-based compensation awards (2) 30,630 Total purchase price 1,063,301 Less: Cash and cash equivalents acquired (44,072 ) Total purchase price, net of cash and cash equivalents acquired $ 1,019,229 (1) Represents cash paid of $30.00 per share for approximately 34,422,361 shares of ESI common stock, without interest and subject to a deduction for any required withholding tax. (2) Represents the vested but not issued portion of ESI share-based compensation awards as of the acquisition date of February 1, 2019.
Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed	The following table summarizes the allocation of the preliminary purchase price to the fair values assigned to assets acquired and liabilities assumed at the date of the ESI Merger: Current assets (excluding inventory) $ 209,194 Inventory 92,364 Intangible assets 318,600 Goodwill 471,403 Property, plant and equipment 52,891 Long-term assets 9,633 Total assets acquired 1,154,085 Current liabilities 51,479 Non-current 32,146 Other long-term liabilities 7,159 Total liabilities assumed 90,784 Fair value of assets acquired and liabilities assumed 1,063,301 Less: Cash and cash equivalents acquired (44,072 ) Total purchase price, net of cash and cash equivalents acquired $ 1,019,229
Schedule of Consolidated Net Revenue and Earnings	The Company’s consolidated net revenue and earnings for the three months ended March 31, 2019 include the following amounts of revenue and earnings of ESI since the acquisition date: Three Months Ended Total net revenues $ 35,218 Net loss $ (31,716 ) Net loss per share: Basic $ (0.59 ) Diluted $ (0.59 )
Schedule of Unaudited Pro Forma Financial Information	The following unaudited pro forma financial information presents the combined results of operations of the Company as if the ESI Merger had occurred on January 1, 2018. The unaudited pro forma financial information is not necessarily indicative of what the Company’s condensed consolidated results of operations actually would have been had the acquisition occurred at the beginning of each year. In addition, the unaudited pro forma financial information does not attempt to project the future results of operations of the combined Company. Three Months Ended 2019 2018 Total net revenues $ 478,069 $ 660,513 Net income $ 49,135 $ 101,633 Net income per share: Basic $ 0.91 $ 1.87 Diluted $ 0.90 $ 1.84
Precisive, LLC [Member]
Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives	The following table reflects the allocation of the acquired intangible assets and related estimate of useful lives: Completed technology - Laser $ 257,900 12 years Completed technology - Non-Laser 18,500 10 years Trademarks and trade names 14,400 7 years Customer relationships 25,400 10 years Backlog 2,400 1 year $ 318,600

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 and year ended December 31, 2018 were as follows: Three Months Ended March 31, 2019 Twelve Months Ended December 31, 2018 Gross Accumulated Net Gross Accumulated Net Beginning balance at January 1 $ 731,272 $ (144,276 ) $ 586,996 $ 735,323 $ (144,276 ) $ 591,047 Acquired goodwill (1) 471,403 — 471,403 — — — Foreign currency translation (1,068 ) — (1,068 ) (4,051 ) — (4,051 ) Ending balance at March 31, 2019 and December 31, 2018 $ 1,201,607 $ (144,276 ) $ 1,057,331 $ 731,272 $ (144,276 ) $ 586,996 (1) During the three months ended March 31, 2019, the Company recorded $471,403 of goodwill related to the ESI Merger.
Intangible Assets	Components of the Company’s intangible assets are comprised of the following: As of March 31, 2019: Gross Accumulated Accumulated Foreign Net Completed technology (1) $ 448,831 $ (105 ) $ (146,614 ) $ (162 ) $ 301,950 Customer relationships (1) 308,144 (1,406 ) (68,738 ) (819 ) 237,181 Patents, trademarks, trade names and other (1) 120,895 — (40,976 ) 41 79,960 $ 877,870 $ (1,511 ) $ (256,328 ) $ (940 ) $ 619,091 (1) During the three months ended March 31, 2019, the Company recorded $318,600 of separately identified intangible assets related to the ESI Merger, of which $276,400 was completed technology, $25,400 was customer relationships and $16,800 was trademarks, trade names and backlog. Separately, on January 1, 2019, the Company reclassified $6,428 of gross favorable lease assets and $3,445 of related accumulated amortization from patents, trademarks, trade names and other to the right-of-use As of December 31, 2018: Gross Impairment Accumulated Foreign Net Completed technology $ 172,431 $ (105 ) $ (137,283 ) $ (73 ) $ 34,970 Customer relationships 282,744 (1,406 ) (63,788 ) (269 ) 217,281 Patents, trademarks, trade names and other 110,523 — (42,954 ) (13 ) 67,556 $ 565,698 $ (1,511 ) $ (244,025 ) $ (355 ) $ 319,807
Estimated Net Amortization Expense	Aggregate net amortization expense related to acquired intangible assets for future years is as follows: Year Amount 2019 (remaining) $ 51,638 2020 55,751 2021 47,958 2022 45,480 2023 45,121 2024 44,204 Thereafter 273,039

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Schedule of Short-Term Debt	March 31, 2019 December 31, 2018 Short-term debt: Japanese lines of credit $ 2,175 $ 2,724 Japanese receivables financing facility 1,020 665 Austrian loans due through March 2020 586 597 Term Loan Facility 6,500 — $ 10,281 $ 3,986
Schedule of Long-Term Debt	March 31, 2019 December 31, 2018 Long-term debt: Austrian loans due through March 2020 and other debt $ 83 $ 86 Term Loan Facility, net (1) 976,740 343,756 $ 976,823 $ 343,842 (1) Net of deferred financing fees, original issuance discount and repricing fee of $15,224 and $4,708 as of March 31, 2019 and December 31, 2018, respectively.
Schedule of Contractual Maturities of Debt Obligations	Contractual maturities of the Company’s debt obligations as of March 31, 2019 are as follows: Year Amount 2019 (remaining $ 8,656 2020 6,583 2021 6,500 2022 6,500 2023 354,964 2024 6,500 Thereafter 612,625

Product Warranties (Tables)

Product Warranties (Tables)	3 Months Ended
	Mar. 31, 2019
Guarantees and Product Warranties [Abstract]
Product Warranty Activities	Product warranty activities were as follows: Three Months Ended March 31, 2019 2018 Beginning of period $ 10,399 $ 10,104 Assumed product warranty liability from ESI Merger 7,177 — Provision for product warranties 6,062 5,184 Direct and other charges to warranty liability (6,705 ) (4,073 ) End of period (1) $ 16,933 $ 11,215 (1) As of March 31, 2019, short-term product warranty of $13,843 and long-term product warranty of $3,090 were included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet. As of March 31, 2018, short-term product warranty of $10,856 and long-term product warranty of $359 were 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, 2019
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, 2019 2018 Numerator: Net income $ 12,455 $ 105,121 Denominator: Shares used in net income per common share – basic 54,147,000 54,423,000 Effect of dilutive securities: Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 701,000 863,000 Shares used in net income per common share – diluted 54,848,000 55,286,000 Net income per common share: Basic $ 0.23 $ 1.93 Diluted $ 0.23 $ 1.90

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 2018 Cost of revenues $ 422 $ 1,005 Research and development expense 810 722 Selling, general and administrative expense 8,038 8,699 Acquisition and integration related expense 18,568 — Total pre-tax $ 27,838 $ 10,426
Summary of Activity for RSUs	The following table presents the activity for RSUs under the Plan: Three Months Ended March 31, 2019 Outstanding RSUs Weighted Average RSUs – beginning of period 647,394 $ 74.04 Assumed shares from ESI Merger 736,133 $ 84.10 Accrued dividend shares 1,558 $ 78.45 Granted 182,212 $ 82.58 Vested (274,898 ) $ 67.57 Forfeited (76,096 ) $ 91.14 RSUs – end of period 1,216,303 $ 81.81
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, 2019 Outstanding SARs Weighted Average SARs – beginning of period 177,538 $ 28.52 Assumed SARs from ESI Merger 12,787 $ 17.38 Exercised (23,569 ) $ 27.34 Forfeited or expired (184 ) $ 27.89 SARs Outstanding – end of period 166,572 $ 27.86

Business Segment, Geographic _2

Business Segment, Geographic Area, Product and Significant Customer Information (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Net Revenues, Assets and Goodwill by Reportable Segment	The following table sets forth net revenues by reportable segment: Three Months Ended March 31, 2019 2018 Vacuum & Analysis $ 234,355 $ 348,344 Light & Motion 193,988 205,931 Equipment & Solutions 35,218 — $ 463,561 $ 554,275 The following table sets forth segment assets by reportable segment: March 31, 2019: Vacuum & Analysis Light & Motion Equipment Corporate, Total Segment assets: Accounts receivable $ 160,040 $ 139,592 $ 51,088 $ (14,730 ) $ 335,990 Inventory, net 225,431 164,603 85,690 (91 ) 475,633 Total segment assets $ 385,471 $ 304,195 $ 136,778 $ (14,821 ) $ 811,623 December 31, 2018: Vacuum & Analysis Light & Motion Equipment Corporate, Total Segment assets: Accounts receivable $ 171,604 $ 140,658 $ — $ (16,808 ) $ 295,454 Inventory, net 222,965 161,658 — 66 384,689 Total segment assets $ 394,569 $ 302,316 $ — $ (16,742 ) $ 680,143 Goodwill associated with each of the Company’s reportable segments is as follows: March 31, 2019 December 31, 2018 Reportable segment: Vacuum & Analysis $ 196,937 $ 197,126 Light & Motion 388,896 389,870 Equipment & Solutions 471,498 — Total goodwill $ 1,057,331 $ 586,996
Reconciliation of Segment Gross Profit to Consolidated Net Income	The following table sets forth a reconciliation of segment gross profit to consolidated net income: Three Months Ended March 31, 2019 2018 Gross profit by reportable segment: Vacuum & Analysis $ 98,139 $ 158,500 Light & Motion 92,741 104,355 Equipment & Solutions 7,238 — Total gross profit by reportable segment 198,118 262,855 Operating expenses: Research and development 38,933 34,857 Selling, general and administrative 82,455 82,949 Fees and expenses related to incremental term loan 5,847 — Acquisition and integration costs 30,167 — Restructuring 223 1,220 Customer contract obligation 1,700 — Environmental costs — 1,000 Amortization of intangible assets 15,727 11,190 Income from operations 23,066 131,639 Interest and other expense, net 7,730 4,897 Income before income taxes 15,336 126,742 Provision for income taxes 2,881 21,621 Net income $ 12,455 $ 105,121
Schedule of Capital Expenditures, Depreciation and Amortization Expense of Intangible Assets by Reportable Segment	The following table sets forth capital expenditures by reportable segment for the three months ended March 31, 2019 and 2018: Vacuum & Analysis Light & Motion Equipment & Total Three Months Ended March 31, 2019: Capital expenditures $ 7,488 $ 5,154 $ 1,887 $ 14,529 Three Months Ended March 31, 2018: Capital expenditures $ 6,197 $ 3,193 $ — $ 9,390 The following table sets forth depreciation and amortization by reportable segment for the three months ended March 31, 2019 and 2018: Vacuum & Analysis Light & Motion Equipment & Total Three Months Ended March 31, 2019: Depreciation and amortization $ 4,045 $ 14,140 $ 7,026 $ 25,211 Three Months Ended March 31, 2018 Depreciation and amortization $ 5,129 $ 15,363 $ — $ 20,492
Reconciliation of Segment Assets to Consolidated Total Assets	The following is a reconciliation of segment assets to consolidated total assets: March 31, 2019 December 31, 2018 Total segment assets $ 811,623 $ 680,143 Cash and cash equivalents and investments 472,692 728,461 Other current assets 86,387 65,790 Property, plant and equipment, net 251,424 194,367 Right-of-use 65,628 — Goodwill and intangible assets, net 1,676,422 906,803 Other assets 48,562 38,682 Consolidated total assets $ 3,412,738 $ 2,614,246
Schedule of Net Revenues and Long-Lived Assets by Geographic Regions	Transfers between geographic areas are at tax transfer prices and have been eliminated from consolidated net revenues. Three Months Ended March 31, 2019 2018 Net revenues: United States $ 224,347 $ 276,720 Korea 35,802 54,011 Japan 42,102 58,274 Asia (excluding Korea and Japan) 101,327 101,384 Europe 59,983 63,886 $ 463,561 $ 554,275 March 31, 2019 December 31, 2018 Long-lived assets: (1) United States $ 198,747 $ 146,687 Europe 29,983 26,794 Asia 57,523 50,572 $ 286,253 $ 224,053 (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 Company groups its product offerings into three groups based upon the similarity of product function as follows: Three Months Ended March 31, 2019 2018 Advanced Manufacturing Components $ 371,345 $ 496,677 Global Service 66,198 57,598 Advanced Manufacturing Systems 26,018 — $ 463,561 $ 554,275

Restructuring (Tables)

Restructuring (Tables)	3 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Schedule of Company's Restructuring Activity	Restructuring activities were as follows: Three Months Ended March 31, 2019 2018 Beginning of period $ 2,632 $ 3,244 Charged to expense 223 1,220 Payments and adjustments (252 ) (1,806 ) End of period $ 2,603 $ 2,658

Recently Issued Accounting Pr_3

Recently Issued Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 65,628
Short-term lease liability	19,459
Long-term lease liability	$ 49,392
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 71,042
Short-term lease liability		20,192
Long-term lease liability		$ 54,147

Leases - Additional Information

Leases - Additional Information (Detail) $ in Thousands	Mar. 31, 2019USD ($)
Leases [Abstract]
Right-of-Use Asset,Operating Lease	$ 65,628
Short-term lease liability	19,459
Long-term lease liability	$ 49,392

Leases - Schedule Of Elements O

Leases - Schedule Of Elements Of Lease Expense (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 5,377
Operating cash flows used for operating leases	$ 5,711
Weighted average discount rate	3.81%
Weighted average remaining lease term	4 years 10 months 24 days

Leases - Schedule Of Future Lea

Leases - Schedule Of Future Lease Payments (Detail) $ in Thousands	Mar. 31, 2019USD ($)
Leases [Abstract]
2019 (remaining)	$ 16,831
2020	18,608
2021	12,687
2022	7,518
2023	6,315
Thereafter	13,761
Total lease payments	75,720
Total lease payments	75,720
Less: imputed interest	6,869
Total operating lease liabilities	$ 68,851

Leases - Minimum Lease Payments

Leases - Minimum Lease Payments under Operating Leases (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 20,106
2020	17,142
2021	10,325
2022	5,573
2023	4,411
Thereafter	8,739
Total minimum lease payments	$ 66,296

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounting Standards Codification Topic 606 adjustment [Member]
Change in Contract with Customer, Liability [Line Items]
Contract assets	$ 3,624	$ 3,624

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Change in Contract with Customer, Liability [Line Items]
Beginning balance, January 1	$ 17,474
Additions to deferred revenue and customer advances	17,219
Amount of deferred revenue and customer advances recognized in income	(13,933)
Ending balance, March 31	24,074
Electro Scientific Industries Inc [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances assumed	$ 3,314

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Schedule of Deferred Revenue and Customer Advances by Arrangement (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	$ 21,056		$ 14,246
Long-term deferred revenue	3,018	$ 3,228
Deferred Revenue [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	13,322	8,134
Customer Advances [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	$ 7,734	$ 6,112

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Net revenues	$ 463,561	$ 554,275
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	234,355	348,344
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	193,988	205,931
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	35,218
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	397,363	496,677
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	192,648	304,336
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	178,697	192,341
Products [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	26,018
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	66,198	57,598
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	41,707	44,008
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	15,291	$ 13,590
Services [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ 9,200

Investments - Investments Class

Investments - Investments Classified as Short-Term Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 44,326	$ 73,826
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	101	102
Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	1,722	989
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments		9,113
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	33,509	19,359
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 8,994	9,352
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments		13,298
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments		$ 21,613

Investments - Investments Cla_2

Investments - Investments Classified as Long-Term Available-for-Sale Investments and Long-Term Cost Method Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities and Cost-method Investments [Line Items]
Investments classified as long-term	$ 10,350	$ 10,290
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	5,950	5,890
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, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	$ 44,569	$ 73,994
Investments, Gross Unrealized Gains	4	7
Investments, Gross Unrealized (Losses)	(247)	(175)
Investments, Estimated Fair Value	44,326	73,826
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	99	102
Investments, Gross Unrealized Gains	2
Investments, Estimated Fair Value	101	102
Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	1,722	989
Investments, Estimated Fair Value	1,722	989
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost		9,121
Investments, Gross Unrealized Gains		1
Investments, Gross Unrealized (Losses)		(9)
Investments, Estimated Fair Value		9,113
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	33,752	19,504
Investments, Gross Unrealized Gains	1
Investments, Gross Unrealized (Losses)	(244)	(145)
Investments, Estimated Fair Value	33,509	19,359
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	8,996	9,367
Investments, Gross Unrealized Gains	1
Investments, Gross Unrealized (Losses)	(3)	(15)
Investments, Estimated Fair Value	8,994	9,352
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost		13,294
Investments, Gross Unrealized Gains		4
Investments, Estimated Fair Value		13,298
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost		21,617
Investments, Gross Unrealized Gains		2
Investments, Gross Unrealized (Losses)		(6)
Investments, Estimated Fair Value		21,613
Group Insurance Contracts [Member] | Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	5,582	5,546
Investments, Gross Unrealized Gains	368	344
Investments, Estimated Fair Value	$ 5,950	$ 5,890

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, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	$ 44,326	$ 73,826
Short-term investments	44,326	73,826
Derivatives - currency forward contracts		2,485
Other assets	48,562	38,682
Derivatives - liabilities		1,168
Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts	3,492
Derivatives - liabilities	322
Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - interest rate hedge - non-current	4,459	6,083
Derivatives - currency forward contracts	4,459	6,083
Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	223,482	290,097
Cash and cash equivalents, including restricted cash (1)	148,701	187,405
Short-term investments	44,326	73,826
Derivatives - currency forward contracts	3,492	2,485
Total current assets	196,519	263,716
Available-for-sale investments	5,950	5,890
Other assets	21,013	20,491
Total long-term assets	26,963	26,381
Derivatives - liabilities	322	1,168
Fair Value Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts	3,492
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	4,459	6,083
Fair Value Measurements, Recurring [Member] | Currency Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts		2,485
Derivatives - liabilities	322	1,168
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	294	180,340
Restricted cash - money market funds	317	110
Deferred compensation plan assets	274
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	3,852	850
Available-for-sale investments	101	102
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	49,084	3,418
Available-for-sale investments		21,613
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	1,722	989
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		9,113
U.S. Treasury Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments		13,298
Mutual Funds and Exchange Traded Funds [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	1,799
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	611	180,450
Cash and cash equivalents, including restricted cash (1)	611	180,450
Total current assets	611	180,450
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	294	180,340
Restricted cash - money market funds	317	110
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	222,871	109,647
Cash and cash equivalents, including restricted cash (1)	148,090	6,955
Short-term investments	44,326	73,826
Derivatives - currency forward contracts	3,492	2,485
Total current assets	195,908	83,266
Available-for-sale investments	5,950	5,890
Other assets	21,013	20,491
Total long-term assets	26,963	26,381
Derivatives - liabilities	322	1,168
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member] | Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts	3,492
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	4,459	6,083
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 - currency forward contracts		2,485
Derivatives - liabilities	322	1,168
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	274
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	3,852	850
Available-for-sale investments	101	102
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	49,084	3,418
Available-for-sale investments		21,613
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	1,722	989
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		9,113
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments		13,298
Significant Other Observable Inputs (Level 2) [Member] | Mutual Funds and Exchange Traded Funds [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	1,799
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	33,509	19,359
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	82,584	2,687
Available-for-sale investments	33,509	19,359
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	82,584	2,687
Available-for-sale investments	33,509	19,359
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	8,994	9,352
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	12,570
Available-for-sale investments	8,994	9,352
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	12,570
Available-for-sale investments	8,994	9,352
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	5,950
Available-for-sale investments		5,890
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	5,950
Available-for-sale investments		5,890
Israeli Pension Assets [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	14,481	14,408
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	$ 14,481	$ 14,408

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
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	$ 418,016	$ 644,345	$ 340,888	$ 333,887
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	$ 269,315	$ 456,940

Derivatives - Additional Inform

Derivatives - Additional Information (Detail) - USD ($)	Sep. 30, 2016	Mar. 31, 2019	Dec. 31, 2018
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		$ 144,002,000	$ 159,394,000
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		$ 290,000,000	290,000,000
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 11. This hedge fixes the interest rate paid on the hedged debt at 1.198% per annum plus the applicable credit spread, which was 2.0% as of March 31, 2019, through September 30, 2020.
Interest rate swap agreement, fair value		$ 4,459,000	$ 6,083,000
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, 2019	Dec. 31, 2018
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 144,002	$ 159,394
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	3,170	1,317
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	39,022	43,770
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	302	(478)
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	54,077	59,149
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	1,424	570
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	20,146	23,515
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	916	688
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	10,921	11,827
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	125	323
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	19,836	21,133
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	$ 403	$ 214

Derivatives - Summary of Fair V

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative assets		$ 2,485
Derivative liabilities		(1,168)
Total net derivative asset designated as hedging instruments	$ 3,170	1,317
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total net derivative asset designated as hedging instruments	7,629	7,400
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	3,492
Derivative liabilities	(322)
Foreign Exchange Contracts [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	3,492	2,485
Derivative liabilities	(322)	(1,168)
Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	4,459	6,083
Interest Rate Hedge [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	$ 4,459	$ 6,083

Derivatives - Summary of Fair_2

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative assets classified in other current assets		$ 2,485
Derivative liabilities classified in other current liabilities		1,168
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets classified in other current assets	$ 3,492
Derivative liabilities classified in other current liabilities	322
Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Derivative assets classified in other current assets	$ 4,459	$ 6,083

Derivatives - Summary of Gains

Derivatives - Summary of Gains (Losses) on Derivatives Designated as Cash Flow Hedging Instruments (Detail) - Forward Exchange Contracts [Member] - Cash Flow Hedging [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Net gain recognized in OCI	$ 67	$ 66
Net gain (loss) reclassified from accumulated OCI into income	$ 949	$ (2,539)

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, 2019	Mar. 31, 2018
Forward Exchange Contracts [Member]
Derivative Instruments Gain Loss Not Designated As Hedging Instruments [Line Items]
Net gain (loss) recognized in income	$ 57	$ (1,253)

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 303,588	$ 235,593
Work-in-process	76,560	61,908
Finished goods	95,485	87,188
Inventories	$ 475,633	$ 384,689

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 01, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Business acquisition share price	$ 30
Stock-based compensation expense		$ 27,838	$ 10,426
Acquisition and integration costs		6,764
Electro Scientific Industries Inc [Member]
Business Acquisition [Line Items]
Business acquisition share price	$ 30
Business acquisition, total cash consideration	$ 1,032,671
Non Cash Consideration related to share based compensation awards	30,630
Total Purchase Consideration	$ 1,063,301
Fair value write-up of acquired finished goods inventory		8,383
Incremental costs of sales charge		5,140
Fair value write-up of acquired property, plant and equipment				$ 26,667
Compensation expense		2,701
Stock-based compensation expense		$ 14,023

Acquisitions - Summary of Purch

Acquisitions - Summary of Purchase Price (Detail) - USD ($) $ in Thousands	Feb. 01, 2019	Mar. 31, 2019
Acquisition Date [Line Items]
Total purchase price, net of cash and cash equivalents acquired		$ 988,599
Electro Scientific Industries Inc [Member]
Acquisition Date [Line Items]
Cash paid for outstanding shares	$ 1,032,671
Settlement of share-based compensation awards	30,630
Total purchase price	1,063,301
Less: Cash and cash equivalents acquired	(44,072)
Total purchase price, net of cash and cash equivalents acquired	$ 1,019,229

Acquisitions - Summary of Pur_2

Acquisitions - Summary of Purchase Price (Parenthetical) (Detail)	Feb. 01, 2019$ / sharesshares
Business Combinations [Abstract]
Business acquisition share price | $ / shares	$ 30
Business acquisition number of shares acquired | shares	34,422,361

Acquisitions - Summary of Estim

Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Feb. 01, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquisition Date [Line Items]
Goodwill		$ 1,057,331	$ 586,996	$ 591,047
Total purchase price, net of cash and cash equivalents acquired		$ 988,599
Electro Scientific Industries Inc [Member]
Acquisition Date [Line Items]
Current assets (excluding inventory)	$ 209,194
Inventory	92,364
Intangible assets	318,600
Goodwill	471,403
Property, plant and equipment	52,891
Long-term assets	9,633
Total assets acquired	1,154,085
Current liabilities	51,479
Non-current deferred taxes	32,146
Other long-term liabilities	7,159
Total liabilities assumed	90,784
Fair value of assets acquired and liabilities assumed	1,063,301
Less: Cash and cash equivalents acquired	(44,072)
Total purchase price, net of cash and cash equivalents acquired	$ 1,019,229

Acquisitions and Dispositions -

Acquisitions and Dispositions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ in Thousands	Feb. 01, 2019	Mar. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 318,600	$ 318,600
Completed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		276,400
Completed Technology [Member] | Lasers Products [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 257,900
Estimated useful life of finite-lived intangible assets	12 years
Completed Technology [Member] | Non Laser Products [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 18,500
Estimated useful life of finite-lived intangible assets	10 years
Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 14,400
Estimated useful life of finite-lived intangible assets	7 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 25,400	$ 25,400
Estimated useful life of finite-lived intangible assets	10 years
Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 2,400
Estimated useful life of finite-lived intangible assets	1 year

Acquisitions and Dispositions_2

Acquisitions and Dispositions - Schedule of Consolidated Net Revenue and Earnings (Detail) - Electro Scientific Industries Inc [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)$ / shares
Acquisition Date [Line Items]
Total net revenues | $	$ 35,218
Net loss | $	$ (31,716)
Net loss per share:
Basic | $ / shares	$ (0.59)
Diluted | $ / shares	$ (0.59)

Acquisitions and Dispositions_3

Acquisitions and Dispositions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Acquisition Date [Line Items]
Total net revenues	$ 478,069	$ 660,513
Net income	$ 49,135	$ 101,633
Net income per share:
Basic	$ 0.91	$ 1.87
Diluted	$ 0.90	$ 1.84

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance, Goodwill Gross Carrying Amount	$ 731,272	$ 735,323
Acquired goodwill	471,403
Foreign currency translation, Gross Carrying Amount	(1,068)	(4,051)
Ending balance, Goodwill Gross Carrying Amount	1,201,607	731,272
Beginning balance, Accumulated Impairment Loss	(144,276)	(144,276)
Acquired goodwill	0	0
Foreign currency translation, Accumulated Impairment Loss	0	0
Ending balance, Accumulated Impairment Loss	(144,276)	(144,276)
Beginning balance, Goodwill Net	586,996	591,047
Foreign currency translation, Net	(1,068)	(4,051)
Ending balance, Goodwill Net	$ 1,057,331	$ 586,996

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Goodwill (Parenthetical) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Goodwill [Line Items]
Acquired goodwill	$ 471,403
Electro Scientific Industries Inc [Member]
Goodwill [Line Items]
Acquired goodwill	$ 471,403

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 877,870	$ 565,698
Impairment Charges	(1,511)	(1,511)
Accumulated Amortization	(256,328)	(244,025)
Foreign Currency Translation	(940)	(355)
Intangible assets, net	619,091	319,807
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	448,831	172,431
Impairment Charges	(105)	(105)
Accumulated Amortization	(146,614)	(137,283)
Foreign Currency Translation	(162)	(73)
Intangible assets, net	301,950	34,970
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	308,144	282,744
Impairment Charges	(1,406)	(1,406)
Accumulated Amortization	(68,738)	(63,788)
Foreign Currency Translation	(819)	(269)
Intangible assets, net	237,181	217,281
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	120,895	110,523
Accumulated Amortization	(40,976)	(42,954)
Foreign Currency Translation	41	(13)
Intangible assets, net	$ 79,960	$ 67,556

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	Feb. 01, 2019	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization		$ 256,328	$ 244,025
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization		68,738	63,788
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization		40,976	$ 42,954
Electro Scientific Industries Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 318,600	318,600
Finite lived intangible asset , gross favorable lease		6,428
Electro Scientific Industries Inc [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price	$ 25,400	25,400
Electro Scientific Industries Inc [Member] | Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization		3,445
Electro Scientific Industries Inc [Member] | Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		276,400
Electro Scientific Industries Inc [Member] | Trademarks Tradenames and Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 16,800

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 15,727	$ 11,190
Amortization income from unfavorable lease commitments	$ 0	$ 407

Goodwill and Intangible Asset_7

Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail) $ in Thousands	Mar. 31, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2019 (remaining)	$ 51,638
2020	55,751
2021	47,958
2022	45,480
2023	45,121
2024	44,204
Thereafter	$ 273,039

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	Feb. 01, 2019	Sep. 30, 2016	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Interest expense			$ 9,119,000	$ 5,430,000
Interest Rate Hedge [Member]
Debt Instrument [Line Items]
Interest rate swap agreement, maturity date		Sep. 30, 2020
Interest rate swap agreement, notional amount			$ 290,000,000		$ 290,000,000
Interest rate swap agreement, credit spread rate			2.00%
Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit			$ 11,275,000
Revolving Lines of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Line of credit base interest rate			1.25%
Austrian [Member]
Debt Instrument [Line Items]
Interest on loans payable			Semi-annually
Austrian [Member] | Minimum [Member]
Debt Instrument [Line Items]
Loan interest rate			0.00%
Austrian [Member] | Maximum [Member]
Debt Instrument [Line Items]
Loan interest rate			0.75%
2016 Term Loan Facility [Member] | Repricing Amendment [Member]
Debt Instrument [Line Items]
Number of repricing amendments			4
2016 Term Loan Facility [Member] | Repricing Amendment [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			1.75%
2016 Term Loan Facility [Member] | Repricing Amendment [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			4.00%
2016 Term Loan Facility [Member] | Repricing Amendment [Member] | LIBOR Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			0.75%
2016 Term Loan Facility [Member] | 2019 Incremental Term Loan Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
LIBOR floor rate			1.00%		0.75%
2016 Term Loan Facility [Member] | 2019 Incremental Term Loan Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			2.00%		1.75%
2016 Term Loan Facility [Member] | Secured Debt Repricing Amendment 2 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			4.50%
Newport [Member] | Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Total borrowings outstanding			$ 3,195,000		$ 3,389,000
Newport [Member] | Asset Based Credit Agreement [Member]
Debt Instrument [Line Items]
Debt issuance cost capitalized			$ 785,000
Contractual term			5 years
Capitalized debt issuance cost			$ 216,000
Newport [Member] | Asset Based Credit Agreement [Member] | Deutsche Bank AG New York [Member]
Debt Instrument [Line Items]
Termination of loans			50,000,000
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 at a rate per annum equal to, at the Company’s option, any of the following, plus, in each case, an applicable margin: (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 0.00%; 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, with a floor of 0.00%. The initial applicable margin for borrowings under the ABL Facility is 0.50% with respect to base rate borrowings and 1.50% with respect to LIBOR borrowings.
Percentage of borrowing based on eligible accounts			85.00%
Percentage of net book value of eligible inventory			20.00%
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			0.25%
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] | Interest Rate Floor [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			0.00%
Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Initial Margin Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			0.50%
Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			1.50%
Newport [Member] | Asset Based Credit Agreement [Member] | Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Secured term loan, face amount			$ 100,000,000
Newport [Member] | Asset Based Credit Agreement [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit			25,000,000
Newport [Member] | 2016 Term Loan Facility [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured term loan, face amount			$ 780,000,000
Debt instrument, interest rate terms			Borrowings under the Term Loan Facility bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, (3) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, and (4) a floor of 1.75%, plus, in each case, an applicable margin; or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR rate floor of 0.75%, plus an applicable margin. The Company has elected the interest rate as described in clause (b). The Credit Agreement provides that all loans will be determined by reference to the Base Rate if the LIBOR rate cannot be ascertained, if regulators impose material restrictions on the authority of a lender to make LIBOR rate loans, or for other reasons. The Term Loan Facility was issued with original issue discount of 1.00% of the principal amount thereof.
Debt instrument, issue discount percentage on principal			1.00%
Debt instrument, maturity date			Apr. 29, 2023
Newport [Member] | 2016 Term Loan Facility [Member] | Secured Debt [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			0.50%
Newport [Member] | 2016 Term Loan Facility [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] | 2016 Term Loan Facility [Member] | Secured Debt [Member] | Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			1.75%
Newport [Member] | 2016 Term Loan Facility [Member] | Secured Debt [Member] | LIBOR Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			0.75%
Newport [Member] | 2016 Term Loan Facility [Member] | 2019 Incremental Term Loan Facility [Member]
Debt Instrument [Line Items]
Deferred finance fees, original issue discount and re-pricing fee, gross			$ 11,362,000
Deferred finance fees, original issue discount and re-pricing fee, net			11,244,000
Newport [Member] | 2016 Term Loan Facility [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
Debt instrument, prepaid principal amount			6,536,000
Newport [Member] | 2016 Term Loan Facility [Member] | Secured Debt Repricing Amendment 1 [Member]
Debt Instrument [Line Items]
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			3,980,000
Newport [Member] | 2016 Term Loan Facility [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	$ 290,000,000
Interest rate swap agreement, interest rate		1.198%
Interest rate swap agreement, credit spread rate			2.00%
Interest rate swap agreement, fair value			$ 4,459,000
Newport [Member] | 2019 Incremental Term Loan Facility [Member] | Secured Debt Repricing Amendment 1 [Member]
Debt Instrument [Line Items]
Secured term loan, face amount			$ 650,000,000
Debt instrument, interest rate			4.70%
Term loan maturity date			Feb. 1, 2026
Debt instrument, pre-payment premium percentage			1.00%
Newport [Member] | 2019 Incremental Term Loan Facility [Member] | Secured Debt Repricing Amendment 1 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, quarterly payment percentage			0.25
Electro Scientific Industries Inc [Member] | 2019 Incremental Term Loan Facility [Member] | Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Debt instrument, interest rate terms	The 2019 Incremental Term Loan Facility matures on February 1, 2026 and bears interest at a rate per annum equal to, at the Company's option, a base rate or LIBOR rate (as described above) plus, in each case, an applicable margin equal to 1.25% with respect to base rate borrowings and 2.25% with respect to LIBOR borrowings.
Debt instrument, issue discount percentage on principal	1.00%
Term loan maturity date	Feb. 1, 2026
Electro Scientific Industries Inc [Member] | 2019 Incremental Term Loan Facility [Member] | Maximum [Member] | Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Business acquisition, term loan debt financing	$ 650,000
Electro Scientific Industries Inc [Member] | 2019 Incremental Term Loan Facility [Member] | LIBOR [Member] | Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	2.25%
Electro Scientific Industries Inc [Member] | 2019 Incremental Term Loan Facility [Member] | Base Rate [Member] | Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.25%

Debt - Schedule of Short Term D

Debt - Schedule of Short Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Short term debt	$ 10,281	$ 3,986
Short term debt	10,281	3,986
Term Loan Facility [Member]
Short-term Debt [Line Items]
Short term debt	6,500
Japan [Member] | Line of Credit [Member]
Short-term Debt [Line Items]
Short term debt	2,175	2,724
Japan [Member] | Receivables Financing Facility [Member]
Short-term Debt [Line Items]
Short term debt	1,020	665
Austrian [Member] | Loans Due Through March 2020 and other debt [Member]
Short-term Debt [Line Items]
Short term debt	$ 586	$ 597

Debt - Schedule of Long Term De

Debt - Schedule of Long Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long term debt	$ 976,823	$ 343,842
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Long term debt	976,740	343,756
Loans Due Through March 2020 and other debt [Member] | Austrian [Member]
Debt Instrument [Line Items]
Long term debt	$ 83	$ 86

Debt - Schedule of Long Term _2

Debt - Schedule of Long Term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Deferred financing fees, original issuance discount and re-pricing fee	$ 15,224	$ 4,708

Debt - Schedule of Contractual

Debt - Schedule of Contractual Maturities of Debt Obligations (Detail)	Mar. 31, 2019USD ($)
Maturities of Long-term Debt [Abstract]
2019 (remaining)	$ 8,656
2020	6,583
2021	6,500
2022	6,500
2023	354,964
2024	6,500
Thereafter	$ 612,625

Product Warranties - Product Wa

Product Warranties - Product Warranty Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Product Warranty Liability [Line Items]
Beginning balance	$ 10,399	$ 10,104
Provision for product warranties	6,062	5,184
Direct and other charges to warranty liability	(6,705)	(4,073)
Ending balance	16,933	$ 11,215
Electro Scientific Industries Inc [Member]
Product Warranty Liability [Line Items]
Assumed product warranty liability from ESI Merger	$ 7,177

Product Warranties - Product _2

Product Warranties - Product Warranty Activities (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Guarantees [Abstract]
Short-term product warranty	$ 13,843	$ 10,856
Long-term product warranty	$ 3,090	$ 359

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	18.80%	17.10%
Accrued interest on unrecognized tax benefits	$ 543		$ 568
Gross unrecognized tax benefits excluding interest and penalties	40,725		$ 32,684
Net unrecognized tax benefits excluding interest and penalties	33,085
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions	$ 1,452

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, 2019	Mar. 31, 2018
Numerator:
Net income	$ 12,455	$ 105,121
Denominator:
Shares used in net income per common share - basic	54,147,000	54,423,000
Effect of dilutive securities:
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan	701,000	863,000
Shares used in net income per common share - diluted	54,848,000	55,286,000
Net income per common share:
Basic	$ 0.23	$ 1.93
Diluted	$ 0.23	$ 1.90

Net Income Per Share - Addition

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Number of shares excluded from computation of diluted earnings per share	128,200	380

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	Apr. 29, 2016	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance		18,000,000
Total compensation expense related to unvested stock-based awards granted to employees, officers and directors		$ 31,356
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted		182,212	122,831
Restricted stock units, weighted average grant date fair value		$ 82.58	$ 109.62
Restricted Stock Units (RSUs) [Member] | Newport Deferred Compensation [Member] | Outside Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Newport RSUs converted to MKS RSUs at Merger date		326,283
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted		0	0
Newport [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued as per merger agreement		748,920
Newport [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued as per merger agreement	736,133
Newport [Member] | Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued as per merger agreement	12,787

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, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 27,838	$ 10,426
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	422	1,005
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	810	722
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	8,038	$ 8,699
Acquisition and Integration Related Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 18,568

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Activity for RSUs (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs/SARs - beginning of period	647,394
Granted	182,212	122,831
Vested	(274,898)
Forfeited	(76,096)
RSUs/SARs - end of period	1,216,303
RSUs/SARs, Weighted Average Grant Date Fair Value, Beginning of period	$ 74.04
Weighted Average Grant Date Fair Value, Granted	82.58	$ 109.62
Weighted Average Grant Date Fair Value, Vested	67.57
Weighted Average Grant Date Fair Value, Forfeited	91.14
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period	$ 81.81
Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued dividend shares	1,558
Weighted Average Grant Date Fair Value, Accrued dividend shares	$ 78.45
Electro Scientific Industries Inc [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed shares from ESI Merger	736,133
Weighted Average Grant Date Fair Value, Assumed shares from ESI Merger	$ 84.10

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Activity for SARs (Detail) - Stock Appreciation Rights (SARs) [Member]	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs/SARs - beginning of period | shares	177,538
Assumed SARs from ESI Merger, Outstanding SARs | shares	12,787
Exercised, Outstanding SARs | shares	(23,569)
Forfeited or expired, Outstanding SARs | shares	(184)
RSUs/SARs - end of period | shares	166,572
RSUs/SARs, Weighted Average Grant Date Fair Value, Beginning of period | $ / shares	$ 28.52
Assumed SARs from ESI Merger, Weighted Average Grant Date Fair Value | $ / shares	17.38
Exercised, Weighted Average Grant Date Fair Value | $ / shares	27.34
Forfeited or expired, Weighted Average Grant Date Fair Value | $ / shares	27.89
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period | $ / shares	$ 27.86

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	May 08, 2019	Jul. 25, 2011	Mar. 31, 2019	Mar. 31, 2018
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		2,588,000	0	0
Value of shares repurchased		$ 127,000,000
Cash dividends per common share			$ 0.20	$ 0.18
Dividend payment to common shareholders			$ 10,843,000	$ 9,808,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Feb. 11, 2019
Cash dividend to be paid	$ 0.20
Dividend to be paid date	Jun. 7, 2019
Dividend declared, shareholders of record date	May 27, 2019

Business Segment, Geographic _3

Business Segment, Geographic Area, Product and Significant Customer Information - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2019Segment	Dec. 31, 2018Product
Segment Reporting [Abstract]
Number of reportable segments | Segment	2
Number of product groups | Product		3

Business Segment, Geographic _4

Business Segment, Geographic Area, Product and Significant Customer Information - Net Revenues by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 463,561	$ 554,275
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Net revenues	234,355	348,344
Light & Motion [Member]
Segment Reporting Information [Line Items]
Net revenues	193,988	$ 205,931
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 35,218

Business Segment, Geographic _5

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, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Gross profit	$ 198,118	$ 262,855
Research and development	38,933	34,857
Selling, general and administrative	82,455	82,949
Fees and expenses related to incremental term loan	5,847
Acquisition and integration costs	30,167
Restructuring	223	1,220
Customer contract obligation	1,700
Environmental costs		1,000
Amortization of intangible assets	15,727	11,190
Income from operations	23,066	131,639
Interest and other expense, net	7,730	4,897
Income before income taxes	15,336	126,742
Provision for income taxes	2,881	21,621
Net income	12,455	105,121
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit	98,139	158,500
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit	92,741	$ 104,355
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 7,238

Business Segment, Geographic _6

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, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Capital expenditures	$ 14,529	$ 9,390
Depreciation and amortization	25,211	20,492
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Capital expenditures	7,488	6,197
Depreciation and amortization	4,045	5,129
Light & Motion [Member]
Segment Reporting Information [Line Items]
Capital expenditures	5,154	3,193
Depreciation and amortization	14,140	$ 15,363
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1,887
Depreciation and amortization	$ 7,026

Business Segment, Geographic _7

Business Segment, Geographic Area, Product and Significant Customer Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Accounts receivable	$ 335,990	$ 295,454
Inventory, net	475,633	384,689
Total assets	3,412,738	2,614,246
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Accounts receivable	160,040	171,604
Inventory, net	225,431	222,965
Total assets	385,471	394,569
Light & Motion [Member]
Segment Reporting Information [Line Items]
Accounts receivable	139,592	140,658
Inventory, net	164,603	161,658
Total assets	304,195	302,316
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Accounts receivable	51,088
Inventory, net	85,690
Total assets	136,778
Operating Segments [Member]
Segment Reporting Information [Line Items]
Accounts receivable	335,990	295,454
Inventory, net	475,633	384,689
Total assets	811,623	680,143
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Accounts receivable	(14,730)	(16,808)
Inventory, net	(91)	66
Total assets	$ (14,821)	$ (16,742)

Business Segment, Geographic _8

Business Segment, Geographic Area, Product and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 3,412,738	$ 2,614,246
Other current assets	86,387	65,790
Property, plant and equipment, net	251,424	194,367
Other assets	48,562	38,682
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	811,623	680,143
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents and investments	472,692	728,461
Other current assets	86,387	65,790
Property, plant and equipment, net	251,424	194,367
Right-of-use asset	65,628
Goodwill and intangible assets, net	1,676,422	906,803
Other assets	$ 48,562	$ 38,682

Business Segment, Geographic _9

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, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 463,561	$ 554,275
Long-lived assets	286,253		$ 224,053
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	224,347	276,720
Long-lived assets	198,747		146,687
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	35,802	54,011
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	42,102	58,274
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	59,983	63,886
Long-lived assets	29,983		26,794
Asia (Excluding Korea and Japan) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	101,327	$ 101,384
Long-lived assets	$ 57,523		$ 50,572

Business Segment, Geographic_10

Business Segment, Geographic Area, Product and Significant Customer Information - Summary of Goodwill Associated with Reportable Segments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Goodwill	$ 1,057,331	$ 586,996	$ 591,047
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Goodwill	196,937	197,126
Light & Motion [Member]
Segment Reporting Information [Line Items]
Goodwill	388,896	$ 389,870
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 471,498

Business Segment, Geographic_11

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, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Net revenues	$ 463,561	$ 554,275
Advanced Manufacturing Components [Member]
Revenue from External Customer [Line Items]
Net revenues	371,345	496,677
Global Service [Member]
Revenue from External Customer [Line Items]
Net revenues	66,198	$ 57,598
Advanced Manufacturing Systems [Member]
Revenue from External Customer [Line Items]
Net revenues	$ 26,018

Restructuring - Additional Info

Restructuring - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reorganizations [Abstract]
Restructuring charges	$ 223	$ 1,220

Restructuring - Schedule of Com

Restructuring - Schedule of Company's Restructuring Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Beginning of period	$ 2,632	$ 3,244
Charged to expense	223	1,220
Payments and adjustments	(252)	(1,806)
End of period	$ 2,603	$ 2,658