MKS Instruments (MKSI) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2019	Oct. 30, 2019
Cover [Abstract]
Amendment Flag	false
Document Type	10-Q
Document Fiscal Year Focus	2019
Document Quarterly Report	true
Document Fiscal Period Focus	Q3
Document Transition Report	false
Current Fiscal Year End Date	--12-31
Document Period End Date	Sep. 30, 2019
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Registrant Name	MKS INSTRUMENTS INC
Entity Central Index Key	0001049502
Trading Symbol	MKSI
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		54,510,355
Entity File Number	0-23621
Entity Tax Identification Number	04-2277512
Entity Address, Address Line One	2 Tech Drive, Suite 201
Entity Address, City or Town	Andover
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01810
Entity Incorporation, State or Country Code	MA
City Area Code	978
Local Phone Number	645-5500
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 386,281	$ 644,345
Short-term investments	88,847	73,826
Trade accounts receivable, net of allowance for doubtful accounts of $5,190 and $5,243 at September 30, 2019 and December 31, 2018, respectively	327,983	295,454
Inventories	463,263	384,689
Other current assets	94,011	65,790
Total current assets	1,360,385	1,464,104
Property, plant and equipment, net	236,124	194,367
Right-of-use asset	67,632
Goodwill	1,054,091	586,996
Intangible assets, net	580,880	319,807
Long-term investments	10,146	10,290
Other assets	45,286	38,682
Total assets	3,354,544	2,614,246
Current liabilities:
Short-term debt	12,623	3,986
Accounts payable	88,078	83,825
Accrued compensation	87,045	82,350
Income taxes payable	11,048	16,358
Lease liability	20,575
Deferred revenue and customer advances	22,363	14,246
Other current liabilities	68,925	62,520
Total current liabilities	310,657	263,285
Long-term debt, net	873,450	343,842
Non-current deferred taxes	69,190	48,223
Non-current accrued compensation	43,704	55,598
Non-current lease liability	47,294
Other liabilities	36,718	30,111
Total liabilities	1,381,013	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; 54,496,664 and 54,039,554 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	113	113
Additional paid-in capital	856,437	793,932
Retained earnings	1,149,457	1,084,797
Accumulated other comprehensive loss	(32,476)	(5,655)
Total stockholders' equity	1,973,531	1,873,187
Total liabilities and stockholders' equity	$ 3,354,544	$ 2,614,246

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 5,190	$ 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	54,496,664	54,039,554
Common stock, shares outstanding	54,496,664	54,039,554

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net revenues:
Net revenues		$ 462,451	$ 487,152	$ 1,400,122	$ 1,614,567
Cost of revenues:
Cost of revenues		257,447	255,292	785,973	844,975
Gross profit		205,004	231,860	614,149	769,592
Research and development		41,566	31,898	122,354	103,259
Selling, general and administrative		82,101	70,822	247,792	229,952
Fees and expenses related to term loan		642		6,489	378
Acquisition and integration costs		2,103	36	35,510	(1,132)
Restructuring and other		1,525	1,364	4,690	4,374
Amortization of intangible assets		17,020	10,695	50,299	32,786
Gain on sale of long-lived assets		(6,773)		(6,773)
Income from operations		66,820	117,045	153,788	399,975
Interest income		1,230	1,516	4,367	4,077
Interest expense		13,542	3,719	35,335	13,071
Other (income) expense, net		(914)	326	199	1,179
Income before income taxes		55,422	114,516	122,621	389,802
Provision for income taxes		7,994	21,239	24,999	68,542
Net income		47,428	93,277	97,622	321,260
Other comprehensive income:
Changes in value of financial instruments designated as cash flow hedges, net of tax (benefit) expense	[1]	(782)	163	(8,554)	8,053
Foreign currency translation adjustments, net of tax of $0		(14,553)	(3,576)	(18,229)	(11,314)
Unrecognized pension gain (loss), net of tax expense (benefit)	[2]	91	24	92	(13)
Unrealized gain (loss) on investments, net of tax expense (benefit)	[3]	16	230	(130)	(95)
Total comprehensive income		$ 32,200	$ 90,118	$ 70,801	$ 317,891
Net income per share:
Basic		$ 0.86	$ 1.71	$ 1.79	$ 5.89
Diluted		$ 0.86	$ 1.70	$ 1.77	$ 5.82
Weighted average common shares outstanding:
Basic		54,945,000	54,476,000	54,636,000	54,539,000
Diluted		55,204,000	54,954,000	55,045,000	55,171,000
Products [Member]
Net revenues:
Net revenues		$ 386,173	$ 426,255	$ 1,184,862	$ 1,432,931
Cost of revenues:
Cost of revenues		216,238	219,311	672,161	747,522
Services [Member]
Net revenues:
Net revenues		76,278	60,897	215,260	181,636
Cost of revenues:
Cost of revenues		$ 41,209	$ 35,981	$ 113,812	$ 97,453
[1]	Tax (benefit) expense was $(242) and $49 for the three months ended September 30, 2019 and 2018, respectively. Tax (benefit) expense was $(2,635) and $2,304 for the nine months ended September 30, 2019 and 2018, respectively
[2]	Tax expense was $31 and $7 for the three months ended September 30, 2019 and 2018, respectively. Tax expense (benefit) was $51 and $(17) for the nine months ended September 30, 2019 and 2018, respectively
[3]	Tax expense was $6 and $17 for the three months ended September 30, 2019 and 2018, respectively. Tax (benefit) was $(40) and $(22) for the nine months ended September 30, 2019 and 2018, respectively.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges	$ (242)	$ 49	$ (2,635)	$ 2,304
Tax on foreign currency translation adjustments	0	0	0	0
Tax (benefit) expense on unrecognized pension loss	31	7	51	(17)
Tax benefit on unrealized loss on investments	$ 6	$ 17	$ (40)	$ (22)

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 (loss)	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
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
Stock repurchase	$ (75,000)
Stock repurchase, Shares	0
Comprehensive income (net of tax):
Net income	$ 321,260
Ending Balance at Sep. 30, 2018	1,810,293	$ 113	786,138	1,023,959	83
Ending Balance, Shares at Sep. 30, 2018		53,984,623
Accounting standards codification topic 606 adjustment	1,809			1,809
Beginning Balance at Mar. 31, 2018	1,698,340	$ 113	791,150	892,820	14,257
Beginning Balance, Shares at Mar. 31, 2018		54,492,103
Net issuance under stock-based plans	(4,132)		(4,132)
Net issuance under stock-based plans, Shares		295,050
Stock-based compensation	6,366		6,366
Cash dividend	(10,942)			(10,942)
Comprehensive income (net of tax):
Net income	122,862			122,862
Other comprehensive gain (loss)	(11,014)				(11,014)
Ending Balance at Jun. 30, 2018	1,801,438	$ 113	793,384	1,004,698	3,243
Ending Balance, Shares at Jun. 30, 2018		54,787,153
Accounting standards codification topic 606 adjustment	(42)			(42)
Net issuance under stock-based plans	(588)		(588)
Net issuance under stock-based plans, Shares		15,601
Stock-based compensation	5,213		5,213
Cash dividend	(10,858)			(10,858)
Stock repurchase	$ (75,000)		(11,871)	(63,129)
Stock repurchase, Shares	(818,131)
Comprehensive income (net of tax):
Net income	$ 93,277			93,277
Other comprehensive gain (loss)	(3,160)				(3,160)
Ending Balance at Sep. 30, 2018	1,810,293	$ 113	786,138	1,023,959	83
Ending Balance, Shares at Sep. 30, 2018		53,984,623
Accounting standards codification topic 606 adjustment	(29)			(29)
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 (loss)	(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
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
Stock repurchase, Shares	0
Comprehensive income (net of tax):
Net income	$ 97,622
Ending Balance at Sep. 30, 2019	1,973,531	$ 113	856,437	1,149,457	(32,476)
Ending Balance, Shares at Sep. 30, 2019		54,496,664
Beginning Balance at Mar. 31, 2019	1,920,861	$ 113	844,261	1,086,409	(9,922)
Beginning Balance, Shares at Mar. 31, 2019		54,231,772
Net issuance under stock-based plans	(2,113)		(2,113)
Net issuance under stock-based plans, Shares		247,920
Stock-based compensation	7,205		7,205
Cash dividend	(10,880)			(10,880)
Stock dividends accrued			232	(232)
Comprehensive income (net of tax):
Net income	37,739			37,739
Other comprehensive gain (loss)	(7,325)				(7,325)
Ending Balance at Jun. 30, 2019	1,945,487	$ 113	849,585	1,113,036	(17,247)
Ending Balance, Shares at Jun. 30, 2019		54,479,692
Net issuance under stock-based plans	(629)		(629)
Net issuance under stock-based plans, Shares		16,972
Stock-based compensation	7,376		7,376
Cash dividend	$ (10,898)			(10,898)
Stock repurchase, Shares	0
Stock dividends accrued			105	(105)
Other	$ (4)			(4)
Comprehensive income (net of tax):
Net income	47,428			47,428
Other comprehensive gain (loss)	(15,229)				(15,229)
Ending Balance at Sep. 30, 2019	$ 1,973,531	$ 113	$ 856,437	$ 1,149,457	$ (32,476)
Ending Balance, Shares at Sep. 30, 2019		54,496,664

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividend, per common share	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.18

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows provided by operating activities:
Net income	$ 97,622	$ 321,260
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	79,863	59,906
Amortization of inventory step-up adjustment to fair value	7,624
Amortization of debt issuance costs, original issue discount, and soft call premium	6,554	3,784
Stock-based compensation	42,140	22,005
Provision for excess and obsolete inventory	18,599	15,575
Provision for doubtful accounts	226	859
Deferred income taxes	(9,067)	(3,525)
Gain on sale of long-lived asset	(6,773)
Other	364	531
Changes in operating assets and liabilities, net of business acquired:
Trade accounts receivable	9,284	(23,125)
Inventories	(25,795)	(80,441)
Income taxes	(760)	(13,874)
Other current and non-current assets	(18,194)	(17,652)
Accrued compensation	(13,449)	(15,529)
Other current and non-current liabilities	3,016	8,934
Accounts payable	(23,992)	(385)
Net cash provided by operating activities	167,262	278,323
Cash flows used in investing activities:
Acquisition of business, net of cash acquired	(988,599)
Purchases of investments	(171,316)	(213,774)
Maturities of investments	93,344	135,339
Sales of investments	162,415	67,868
Proceeds from sale of assets	41,214
Purchases of property, plant and equipment	(44,753)	(36,885)
Net cash used in investing activities	(907,695)	(47,452)
Cash flows provided by (used in) financing activities:
Repurchase of common stock		(75,000)
Net proceeds from short and long-term borrowings	642,180	60,624
Payments on short-term borrowings	(3,927)	(57,865)
Payments on long-term borrowings	(103,869)	(50,002)
Net payments related to employee stock awards	(11,728)	(13,641)
Dividend payments to common stockholders	(32,621)	(31,608)
Net cash provided by (used in) financing activities	490,035	(167,492)
Effect of exchange rate changes on cash and cash equivalents	(7,666)	2,584
(Decrease) increase in cash and cash equivalents	(258,064)	65,963
Cash and cash equivalents at beginning of period	644,345	333,887
Cash and cash equivalents at end of period	$ 386,281	$ 399,850

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 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 September 30, 2019, and for the three and nine months ended September 30, 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	9 Months Ended
	Sep. 30, 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 the impact of pending In August 2017, the FASB issued ASU 2017-12, In February 2016, the FASB issued ASU 2016-02, 2016-02 The Company implemented internal controls and a lease accounting information system to enable preparation on adoption. Upon adoption, the Company recorded a cumulative effect of initially applying this new standard, resulting in the addition of $71,042 of right-of-use right-of-use re-classified right-of-use In June 2016, the FASB issued ASU 2016-13, the impact of pending adoption on the Company’s consolidated financial statements.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Text Block [Abstract]
Leases	3) Leases The Company has various operating leases for real estate and non-real 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 Nine Months Lease Cost: Operating lease cost $ 6,313 $ 17,694 The weighted average discount rate and the weighted average remaining lease term were % and years, respectively, for the period ended September , . Operating cash flows used for operating leases for the nine months ended September , was $ . Future lease payments under non-cancelable Amount Year Ending December 31, 2019 (remaining) $ 5,887 2020 21,569 2021 14,064 2022 8,497 2023 7,158 Thereafter 17,453 Total lease payments 74,628 Less:imputed interest 6,759 Total operating lease liabilities $ 67,869 Minimum lease payments under operating leases prior to adoption of ASU 2016-02 Operating Year Ending December 31, 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	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	4) Revenue from Contracts with Customers Contract assets as of September 30, 2019 and December 31, 2018 were $3,405 and $3,624, respectively, and included in other current assets . A rollforward of the Company’s deferred revenue and customer advances is as follows: Nine Months September 30, Beginning balance, January 1 (1) $ 17,474 Deferred revenue and customer advances assumed in ESI Merger 4,629 Additions to deferred revenue and customer advances 41,922 Amount of deferred revenue and customer advances recognized in (38,787 ) Ending balance, September 30 (2) $ 25,238 (1) Beginning deferred revenue and customer advances as of January 1, 2019 included $ 8,134 3,228 6,112 (2) Ending deferred revenue as of September 30, 2019 included $ 14,161 2,874 8,202 Disaggregation of Revenue The following table summarizes revenue from contracts with customers: Three Months Ended September 30, 2019 Vacuum & Analysis Light & Motion Equipment & Total Net revenues: Products $ 197,203 $ 156,436 $ 32,534 $ 386,173 Services 43,478 16,024 16,776 76,278 Total net revenues $ 240,681 $ 172,460 $ 49,310 $ 462,451 Three Months Ended September 30, 201 8 Vacuum & Analysis Light & Motion Equipment & Total Net revenues: Products $ 239,924 $ 186,331 $ — $ 426,255 Services 46,114 14,783 — 60,897 Total net revenues $ 286,038 $ 201,114 $ — $ 487,152 Nine Months Ended September 30, 2019 Vacuum & Analysis Light & Motion Equipment & Total Net revenues: Products $ 581,611 $ 502,496 $ 100,755 $ 1,184,862 Services 129,080 46,531 39,649 215,260 Total net revenues $ 710,691 $ 549,027 $ 140,404 $ 1,400,122 Nine Months Ended September 30, 2018 Vacuum & Analysis Light & Motion Equipment & Total Net revenues: Products $ 865,714 567,217 $ — $ 1,432,931 Services 136,996 44,640 — 181,636 Total net revenues $ 1,002,710 $ 611,857 $ — $ 1,614,567 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	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Investments	5) Investments The fair value of investments classified as short-term consists of the following: September 30, December 31, Available-for-sale Time deposits and certificates of deposit $ 6,262 $ 102 Bankers’ acceptance drafts 4,540 989 Asset-backed securities — 9,113 Commercial paper 44,981 19,359 Corporate obligations — 9,352 U.S. treasury obligations 3,602 13,298 U.S. agency obligations 29,462 21,613 $ 88,847 $ 73,826 Investments classified as long-term consist of the following: September 30, December 31, Available-for-sale Group insurance contracts $ 5,746 $ 5,890 Cost method investments: Minority interest in a private company 4,400 4,400 $ 10,146 $ 10,290 The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale As of September 30 , 2019: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Short-term investments: Available-for-sale Time deposits and certificates of deposit $ 6,261 $ 1 $ — $ 6,262 Bankers’ acceptance drafts 4,540 — — 4,540 Commercial paper 45,342 — (361 ) 44,981 U.S. treasury obligations 3,601 1 — 3,602 U.S. agency obligations 29,460 4 (2 ) 29,462 $ 89,204 $ 6 $ (363 ) $ 88,847 As of September 30 , 2019: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Long-term investments: Available-for-sale Group insurance contracts $ 5,329 $ 417 $ — $ 5,746 As of December 31 , 2018: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value 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 Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value 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 September 30, 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	9 Months Ended
	Sep. 30, 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 September 30, 2019 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description September 30, 2019 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Cash equivalents: Money market funds $ 4,732 $ 4,732 $ — $ — Time deposits and certificates of deposit 4,651 — 4,651 — Commercial paper 40,966 — 40,966 — U.S. treasury obligations 7,999 — 7,999 — U.S. agency obligations 20,592 — 20,592 — Restricted cash – money market funds 330 330 — — Available-for-sale Time deposits and certificates of deposit 6,262 — 6,262 — Bankers’ acceptance drafts 4,540 — 4,540 — Commercial paper 44,981 — 44,981 — U.S. treasury 3,602 — 3,602 — U.S. agency obligations 29,462 — 29,462 — Group insurance contracts 5,746 — 5,746 — Derivatives – currency forward contracts 4,232 — 4,232 — Funds in investments and other assets: Israeli pension assets 16,135 — 16,135 — Deferred compensation plan assets: Mutual funds and exchange traded funds 1,832 — 1,832 — Money market securities 483 — 483 — Total assets $ 196,545 $ 5,062 $ 191,483 $ — Liabilities: Derivatives – currency forward contracts $ 308 $ — $ 308 $ — Derivatives – interest rate hedge – non-current 6,908 — 6,908 — Total liabilities $ 7,216 $ — $ 7,216 $ — Reported as follows: Assets: Cash and cash equivalents, including restricted cash (1) $ 79,270 $ 5,062 $ 74,208 $ — Short-term investments 88,847 — 88,847 — Other current assets 4,232 — 4,232 — Total current assets $ 172,349 $ 5,062 $ 167,287 $ — Long-term investments (2) $ 5,746 $ — $ 5,746 $ — Other assets 18,450 — 18,450 — Total long-term assets $ 24,196 $ — $ 24,196 $ — Liabilities: Other current liabilities $ 308 $ — $ 308 $ — Other liabilities $ 6,908 $ — $ 6,908 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $307,011 as of September 30, 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, Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Cash equivalents: Money market funds $ 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 Investments 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. Cost Method Investments The Company has a non-controlling non-marketable 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	9 Months Ended
	Sep. 30, 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 Agreements On September 30, 2016, the Company entered into an interest rate swap agreement to fix the rate on approximately 50 1.198 1.75 September 30, 2020 At September 30, 2019, the notional amount of this transaction was $ and it had a fair value asset of $ . At December 31, 2018, the notional amount of this transaction was $ and it had a fair value asset of $ . On April 3, 2019, the Company entered into an interest rate swap agreement, which has a maturity date of March 31, 2023, to fix the rate on $300,000 of the then-outstanding balance of the 2019 Incremental Term Loan Facility, as described further in Note 11. The rate wa it The interest rate swaps are 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 these arrangements are no longer an effective hedge, any ineffectiveness measured in the hedging relationships is recorded currently in earnings in the period it occurs. 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 September 30, 2019 and December 31, 2018, the Company had outstanding forward foreign exchange contracts with gross notional values of $142,789 and $159,394, respectively. The following tables provide a summary of the primary net hedging positions and corresponding fair values held as of September 30, 2019 and December 31, 2018: September 30, 2019 Currency Hedged (Buy/Sell) Gross Fair (1) U.S. Dollar/Japanese Yen $ 43,339 $ (83 ) U.S. Dollar/South Korean Won 42,082 2,191 U.S. Dollar/Euro 31,689 1,326 U.S. Dollar/U.K. Pound Sterling 7,320 382 U.S. Dollar/Taiwan Dollar 18,359 108 Total $ 142,789 $ 3,924 December 31, 2018 Currency Hedged (Buy/Sell) Gross Fair (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: September 30, December 31, Derivative assets: Foreign exchange contracts (1) $ 4,232 $ 2,485 Interest rate hedge (2) — 6,083 Derivative liabilities: Foreign exchange contracts (1) (308 ) (1,168 ) Interest rate hedge (2) (6,908 ) — Total net derivative (liability) $ (2,984 ) $ 7,400 (1) The derivative assets of $4,232 and $2,485 as of September 30, 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 $308 and $1,168 as of September 30, 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 interest rate hedge liability of $ 6,908 6,083 The net amount of existing gains as of September 30, 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 September 30, Nine Months September 30, Derivatives Designated as Cash Flow Hedging Instruments 2019 2018 2019 2018 Forward exchange contracts: Net gain (loss) recognized in OCI (1) $ (1,024 ) $ 212 $ (11,189 ) $ 10,357 Net gain (loss) reclassified from accumulated OCI into income (2) $ 2,000 $ 306 $ 4,077 $ (4,882 ) (1) Net change in the fair value of the effective portion classified in OCI. (2) Effective portion classified in cost of products for the three and nine months ended September 30, 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 September 30, Nine Months September 30, Derivatives Not Designated as Hedging Instruments 2019 2018 2019 2018 Forward exchange contracts: Net gain (loss) recognized in income (1) $ 82 $ (111 ) $ (166 ) $ 12 (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	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories	8) Inventories Inventories consist of the following: September 30, December 31, Raw materials $ 291,613 $ 235,593 Work-in-process 84,814 61,908 Finished goods 86,836 87,188 $ 463,263 $ 384,689

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 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 was $1,032,671, which excludes 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 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) $ 208,009 Inventory 83,036 Intangible assets 316,200 Goodwill 471,722 Property, plant and equipment 65,489 Long-term assets 9,633 Total assets acquired 1,154,089 Current liabilities 51,479 Non-current 32,150 Other long-term liabilities 7,159 Total liabilities assumed 90,788 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 During the second quarter of 2019, the Company recorded an increase in fair value of approximately $12,600 to property, plant and equipment, based upon the final valuation for land and three ESI facilities located in Portland, Oregon. The Company also recorded a reduction in fair value of approximately $9,800 to inventories relating to three product lines. These adjustments also resulted in an adjustment to intangible assets of $2,400 and goodwill of $1,300 and the related impact to the deferred tax line items. The fair value write-up F nine September of incremental cost of sales charges associated with the fair value write-up The fair value of acquired property, plant and equipment of $ will be amortized over the estimated useful life of the applicable assets, excluding the fair value write-up in the value of land. Property, plant and equipment is valued at its value-in-use, unless there was a known plan to dispose of the asset. 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 $ 255,700 12 Completed technology - Non-Laser 18,300 10 Trademarks and trade names 14,400 7 Customer relationships 25,400 10 Backlog 2,400 1 $ 316,200 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. 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. 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 broadening its position in key industrial end markets to complementary solutions, and 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 nine months ended September period-end, The Company’s consolidated net revenue and earnings for the three and nine months ended September 30, 2019 include the following amounts of revenue and earnings of ESI since the acquisition date: Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Total net revenues $ 49,308 $ 140,403 Net loss $ (5,843 ) $ (40,685 ) Net loss Basic $ (0.11 ) $ (0.74 ) Diluted $ (0.11 ) $ (0.74 ) 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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Total net revenues $ 462,451 $ 573,070 $ 1,414,660 $ 1,917,348 Net income $ 47,669 $ 91,111 $ 127,676 $ 357,333 Net income Basic $ 0.87 $ 1.67 $ 2.34 $ 6.55 Diluted $ 0.86 $ 1.65 $ 2.32 $ 6.48 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 2019 Incremental Term Loan Facility, as defined and discussed in Note 11. (4) The exclusion of acquisition costs and inventory step-up (5) The exclusion of debt issuance costs due to the modification of the 2019 Incremental Term Loan Facility from the three and nine month periods ended September 30, 2019 and the addition of this item to the three and nine month periods ended September 30, 2018. (6) The estimated tax impact of the above adjustments. During the third quarter of 2019, the Company identified adjustments related to our unaudited pro forma disclosures that were reported during the first and second quarters of 2019. The impact of these adjustments has been revised for all periods presented above.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 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 nine months ended September 30, 2019 and year ended December 31, 2018 were as follows: Nine Months Ended Twelve Months Ended December 31, 2018 Gross Carrying Amount Accumulated Impairment Loss Net Gross Carrying Amount Accumulated Impairment Loss Net Beginning balance at January 1 $ 731,272 $ (144,276 ) $ 586,996 $ 735,323 $ (144,276 ) $ 591,047 Acquired goodwill (1) 471,727 — 471,727 — — — Foreign currency translation (4,632 ) — (4,632 ) (4,051 ) — (4,051 ) Ending balance at September $ 1,198,367 $ (144,276 ) $ 1,054,091 $ 731,272 $ (144,276 ) $ 586,996 (1) During the nine months ended September 30, 2019, the Company recorded $ 471,727 Intangible Assets Components of the Company’s intangible assets are comprised of the following: As of September 30, 2019 Gross Accumulated Impairment Charges Accumulated Amortization Foreign Currency Translation Net Completed technology (1) $ 446,431 $ (105 ) $ (167,816 ) $ (282 ) $ 278,228 Customer relationships (1) 308,144 (1,406 ) (79,028 ) (2,066 ) 225,644 Patents, trademarks, trade names and other (1) 120,895 — (44,036 ) 149 77,008 $ 875,470 $ (1,511 ) $ (290,880 ) $ (2,199 ) $ 580,880 (1) During the nine months ended September 30, 2019, the Company recorded $316,200 of separately identified intangible assets related to the ESI Merger, of which $274,000 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 Accumulated Impairment Charges Accumulated Amortization Foreign Currency Translation 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 nine months ended September 30, 2019 and 2018 was $50,299 and $32,786, respectively. Aggregate net amortization expense related to acquired intangible assets for future years is as follows: Year Amount 2019 (remaining) $ 17,382 2020 55,392 2021 47,617 2022 45,182 2023 44,844 2024 43,927 Thereafter 270,636

Debt

Debt	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Debt	11) Debt Term Loan Credit Agreement In connection with the completion of the acquisition of Newport Corporation (“Newport”) 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 and 2019 Term Loan Refinancing Facility (each the “Term Loan Facility”). Prior to the effectiveness of Amendment No. 6 (as defined below), the had a maturity date of As of September 30, 2019, borrowings The Wall Street Journal, b r The Company subsequently entered into four On September 30, 2016, the Company entered into an interest rate swap agreement, which has a maturity date of September 30, 2020 wa 1.75 it 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. 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 original On April 3, 2019, the Company entered into an interest rate swap agreement, which has a maturity date of March 31, 2023, to fix the rate on $300,000 of the then-outstanding balance of the 2019 Incremental Term Loan Facility. The rate wa it 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. On September 27, 2019, the Company entered into an amendment (“Amendment No. 6”) to the Credit Agreement. Amendment No. 6 refinanced all existing loans outstanding under the 2016 Term Loan Facility and 2019 Incremental Term Loan Facility (“Existing Term Loans”) for a tranche B-6 term loan commitment in the original principal amount of $896,839 (“2019 Term Loan Refinancing Facility”). Each lender of the Existing Term Loans who elected to participate in the 2019 Term Loan Refinancing Facility was deemed to have exchanged the aggregate outstanding principal amount of its Existing Term Loans outstanding under the Credit Agreement for an equal aggregate principal amount of tranche B-6 term loans under the 2019 Term Loan Refinancing Facility. On the effective date of Amendment No. 6 and immediately prior to the exchanges described above, the Company made a voluntary prepayment of $50,000, which was applied to the The Company incurred $2,242 of original issue discount fees related to the term loans under the 2019 Term Loan Refinancing 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 September 30, 2019, the remaining balance of deferred finance fees and original issue discount of the Term Loan Facility was $12,258. A portion of the deferred finance fees and original issue discount have been accelerated in connection with the various debt prepayments and extinguishments during 2016, 2017, 2018 and 2019. The 2019 Term Loan Refinancing Facility matures on February 2, 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 0.75% with respect to base rate borrowings and 1.75% with respect to LIBOR borrowings. The 2019 Term Loan Refinancing Facility was issued with original issue discount of 0.25% of the principal amount thereof. The Company is required to make scheduled quarterly payments each equal to 0.25% of the original principal amount of the 2019 Term Loan Refinanci ng February 2, 2026 6 Refinancing As of September 30, 2019, after total principal prepayments of $525,000 (which includes a $50,000 prepayment made during the three months ended September 30, 2019) and principal balance of the Term Loan Facility was $894,597 and the interest rate was 3.59%. Under the Credit Agreement, the Company is required to prepay outstanding term loans , subject to certain exceptions, with portions of its annual excess cash flow as well as with the net cash proceeds of certain of its current t l r period ended September 3 0 9 . 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 September 30, 2019, the Company was in compliance with all covenants under the Credit Agreement. S On February 1, 2019, in connection with the completion of the ESI Merger, the Company 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”). On April 26, 2019, the Company entered into a First Amendment to the ABL Credit Agreement which amended the borrowing base calculation for eligible inventory prior to an initial field examination and appraisal requirements. 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 field 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, in each case, subject to additional limitations and examination requirements for eligible accounts and eligible inventory acquired in an acquisition after February 1, 2019. 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 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 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 a prior asset-based facility being terminated concurrently with our entry into the ABL Facility, 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. The Company has not borrowed against this ABL Facility to date. 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 September 30, 2019 of up to an equivalent of $21,308. One of the borrowing arrangements has an interest rate based on the Tokyo Interbank Offer Rate at the time of borrowing and the other has an interest rate based on the Japanese Short-Term Prime Lending Rate. There were no borrowings outstanding under these arrangements at September 30, 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 September 30, 2019, provided for aggregate borrowings of up to an equivalent of $11,581. These lines of credit have a base interest rate of 1.24% plus a Japanese Yen overnight LIBOR rate. Total borrowings outstanding under these arrangements were $3,655 and $3,389 at September 30, 2019 and December 31, 2018, respectively. September 30, December 31, Short-term debt: Japanese lines of credit $ 3,627 $ 2,724 Japanese receivables financing facility 28 665 Other debt — 597 Term Loan Facility 8,968 — $ 12,623 $ 3,986 September 30, December 31, Long-term debt: Other debt $ 79 $ 86 Term Loan Facility, net (1) 873,371 343,756 $ 873,450 $ 343,842 (1) Net of deferred financing fees, original issuance discount and repricing fee of $12,258 and $4,708 as of September 30, 2019 and December 31, 2018, respectively . The Company recognized interest expense of $13,542 and $35,335 for the three and nine months ended September 30, 2019 , respectively. The Company recognized interest expense of $3,719 and $13,071 for the three and nine months ended September 30, 2018, respectively. Contractual maturities of the Company’s debt obligations as of September 30, 2019 are as follows: Year Amount 2019 (remaining) $ 5,897 2020 9,037 2021 8,979 2022 8,968 2023 8,968 2024 8,968 Thereafter 847,514

Product Warranties

Product Warranties	9 Months Ended
	Sep. 30, 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: Nine Months Ended 2019 2018 Beginning of period $ 10,399 $ 10,104 Assumed product warranty liability from ESI Merger 7,177 — Provision for product warranties 18,700 11,448 Direct and other charges to warranty liability (21,209 ) (11,072 ) End of period (1) $ 15,067 $ 10,480 (1) As of September 30, 2019, short-term product warranty of $12,028 and long-term product warranty of $3,039 were included within other ​​​​​​​current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet. As of September 30, 2018, short-term product warranty of $10,067 and long-term product warranty of $413 were included within other current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet .

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	13 ) Income Taxes The Company’s effective tax rates for the three and nine months ended September 30, 2019 were 14.4% and 20.4%, respectively. The effective tax rates for the three and nine months ended September 30, 2019, and related income tax expense, were lower than the U.S. statutory tax rate due to the deduction for foreign derived intangible income, the geographic mix of income earned by the Company’s international subsidiaries being taxed at rates lower than the U.S. statutory tax rate and the impact of various tax credits, offset by the tax effects of the global intangible low-taxed out-of-period 3.8% , respectively adjus t The Company’s effective tax rates for the three and nine months ended September 30, 2018 were 18.5% and 17.6%, respectively. The effective tax rates for the three and nine months ended September 30, 2018, and 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 , - As of September 30, 2019, the total amount of gross unrecognized tax benefits, which excludes interest and penalties, was approximately $41,170. 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 September 30, 2019, if these benefits were recognized in a future period, the timing of which is not estimable, the net unrecognized tax benefit of $33,415, excluding interest and penalties, would impact the Company’s effective tax rate. The Company accrues interest expense, and if applicable, penalties, for any uncertain tax positions. Interest and penalties are classified as a component of income tax expense. As of September 30, 2019 and December 31, 2018, the Company had accrued interest on unrecognized tax benefits of approximately $581 and $568, respectively. Over the next 12 months it is reasonably possible that the Company may recognize approximately $1,225 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, for tax year 2015. This audit commenced during the quarter ended June 30, 2018 and was effectively settled during the quarter ended June 30, 2019 with a no change result. The U.S. statute of limitations remains open for tax years 2016 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	9 Months Ended
	Sep. 30, 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 Nine Months Ended 2019 2018 2019 2018 Numerator: Net income $ 47,428 $ 93,277 $ 97,622 $ 321,260 Denominator: Shares used in net income per common share – basic 54,945,000 54,476,000 54,636,000 54,539,000 Effect of dilutive securities: Restricted stock units, stock appreciation rights and 259,000 478,000 409,000 632,000 Shares used in net income per common share – diluted 55,204,000 54,954,000 55,045,000 55,171,000 Net income per common share: Basic $ 0.86 $ 1.71 $ 1.79 $ 5.89 Diluted $ 0.86 $ 1.70 $ 1.77 $ 5.82 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 (“RSUs”) and stock appreciation rights (“SARs”)) had been converted to such common shares, and if such assumed conversion is dilutive. For the three and nine months ended September 30, 2019, there were approximately 204,000 165,000 For the three and nine months ended September 30, 2018, there were approximately 159,800 68,800

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	15) Stock-Based Compensation The Company grants 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 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) such SAR s 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 (the “ESI DC 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 nine months ended September 30, 2019, the Company granted 417,335 RSUs with a weighted average grant date fair value of $86.18. During the nine months ended September 30, 2018, the Company granted 260,341 RSUs with a weighted average grant date fair value of $112.49. There were no SARs granted during the nine months ended September 30, 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 Nine Months Ended 2019 2018 2019 2018 Cost of revenues $ 818 $ 170 $ 1,876 $ 2,664 Research and development expense 971 708 2,842 2,249 Selling, general and administrative expense 4,009 4,335 16,253 17,092 Acquisition and integration related expense 1,202 — 20,796 — Restructuring related expense 373 — 373 — Total pre-tax $ 7,373 $ 5,213 $ 42,140 $ 22,005 At September 30, 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 $30,795, 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: Nine Months Ended September 30, 2019 Outstanding RSUs Weighted Average Grant Date Fair Value RSUs – beginning of period 647,394 $ 74.04 Assumed shares from ESI Merger 736,133 $ 84.10 Accrued dividend shares 4,307 $ 79.20 Granted 417,335 $ 86.18 Vested (533,007 ) $ 69.11 Forfeited (134,833 ) $ 89.58 RSUs – end of period 1,137,329 $ 85.50 The following table presents the activity for SARs under the Plan: Nine Months Ended September 30, 2019 Outstanding SARs Weighted Average Grant Date Fair Value SARs – beginning of period 177,538 $ 28.52 Assumed SARs from ESI Merger 12,787 $ 17.38 Exercised (46,414 ) $ 27.07 Forfeited or expired (3,998 ) $ 23.00 SARs o 139,913 $ 28.18

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 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 and nine months ended September 30, 2019, there were no repurchases of common stock. During the three and nine months ended September 30, 2018, the Company repurchased approximately 818,000 shares of its common stock for $75,000, or an average of $91.67 per share . Cash Dividends Holders of the Company’s common stock are entitled to receive dividends when they are declared by the Company’s Board of Directors. 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. The Company’s Board of Directors declared a cash dividend of $0.20 per share during each of the first, second and third quarters of 2019, which totaled $32,621 or $0.60 per share. The Company’s Board of Directors declared a cash dividend of $0.18 per share during the first quarter of 2018 and $0.20 per share during the second and third quarters of 2018, which totaled $31,608 or $0.58 per share. On October 28, 2019, the Company’s Board of Directors declared a quarterly cash dividend of $0.20 per share to be paid on December 6, 2019 to shareholders of record as of November 25, 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 Term Loan Facility and ABL Facility, the Company may be restricted from paying dividends under certain circumstances.

Business Segment, Geographic Ar

Business Segment, Geographic Area and Product Information	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Business Segment, Geographic Area and Product Information	17) Business Segment, Geographic Area and 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 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 two then-existing 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 Nine Months Ended 2019 2018 2019 201 8 Vacuum & Analysis $ 240,681 $ 286,038 $ 710,691 $ 1,002,710 Light & Motion 172,460 201,114 549,027 611,857 Equipment & Solutions 49,310 — 140,404 — $ 462,451 $ 487,152 $ 1,400,122 $ 1,614,567 The following table sets forth a reconciliation of segment gross profit to consolidated net income : Three Months Ended Nine Months Ended 2019 2018 2019 2018 Gross profit by reportable segment: Vacuum & Analysis $ 102,826 $ 132,835 $ 303,060 $ 462,418 Light & Motion 79,873 99,025 257,562 307,174 Equipment & Solutions 22,305 — 53,527 — Total gross profit by reportable segment 205,004 231,860 614,149 769,592 Operating expenses: Research and development 41,566 31,898 122,354 103,259 Selling, general and administrative 82,101 70,822 247,792 229,952 Fees and expenses related to term loan 642 — 6,489 378 Acquisition and integration costs 2,103 36 35,510 (1,132 ) Restructuring and other 1,525 1,364 4,690 4,374 Amortization of intangible assets 17,020 10,695 50,299 32,786 Gain on sale of long-lived assets (6,773 ) — (6,773 ) — Income from operations 66,820 117,045 153,788 399,975 Interest and other expense, net 11,398 2,529 31,167 10,173 Income before income taxes 55,422 114,516 122,621 389,802 Provision for income taxes 7,994 21,239 24,999 68,542 Net income $ 47,428 $ 93,277 $ 97,622 $ 321,260 The following table sets forth capital expenditures by reportable segment for the three and nine months ended September 30, 2019 and 2018: Vacuum & Analysis Light & Motion Equipment & Total Three Months Ended September 30, 2019: Capital expenditures $ 7,461 $ 6,767 $ 2,271 $ 16,499 Nine Months Ended September 30, 2019: Capital expenditures $ 21,649 $ 16,859 $ 6,245 $ 44,753 Three Months Ended September 30, 2018: Capital expenditures $ 9,532 $ 5,535 $ — $ 15,067 Nine Months Ended September 30, 2018: Capital expenditures $ 22,701 $ 14,184 $ — $ 36,885 The following table sets forth depreciation and amortization by reportable segment for the three and nine months ended September 30, 2019 and 2018: Vacuum & Analysis Light & Motion Equipment & Total Three Months Ended September 30, 2019: Depreciation and amortization $ 4,222 $ 12,992 $ 9,994 $ 27,208 Nine Months Ended September 30, 2019 Depreciation and amortization $ 12,208 $ 40,424 $ 27,231 $ 79,863 Three Months Ended September 30, 2018: Depreciation and amortization $ 5,083 $ 14,446 $ — $ 19,529 Nine Months Ended September 30, 2018: Depreciation and amortization $ 15,180 $ 44,726 $ — $ 59,906 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: September 30, 2019: Vacuum & Analysis Light & Motion Equipment & Corporate, Eliminations & Other Total Segment assets: Trade accounts receivable $ 156,066 $ 159,061 $ 40,289 $ (27,433 ) $ 327,983 Inventories 221,182 168,597 73,449 35 463,263 Total segment assets $ 377,248 $ 327,658 $ 113,738 $ (27,398 ) $ 791,246 December 31, 2018: Vacuum & Analysis Light & Motion Equipment & Corporate, Eliminations & Other Total Segment assets: Trade accounts receivable $ 171,604 $ 140,658 $ — $ (16,808 ) $ 295,454 Inventories 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: September 30, 2019 December 31, 2018 Total segment assets $ 791,246 $ 680,143 Cash and cash equivalents and investments 485,274 728,461 Other current assets 94,011 65,790 Property, plant and equipment, net 236,124 194,367 Right-of-use 67,632 — Goodwill and intangible assets, net 1,634,971 906,803 Other assets 45,286 38,682 Consolidated total assets $ 3,354,544 $ 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. Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Net revenues: United States $ 211,116 $ 243,273 $ 653,012 $ 801,811 China 46,679 35,554 140,469 98,631 Korea 41,313 43,468 116,011 164,462 Japan 32,388 38,964 105,485 151,325 Other Asia 77,360 69,782 213,325 215,282 Europe 53,595 56,111 171,820 183,056 $ 462,451 $ 487,152 $ 1,400,122 $ 1,614,567 Long-lived assets: (1) September 30, 2019 December 31, 2018 United States $ 171,324 $ 146,687 Europe 30,514 26,794 Asia 60,072 50,572 $ 261,910 $ 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​​​​​​​: September 30, December 31, Reportable segment: Vacuum & Analysis $ 195,431 $ 197,126 Light & Motion 386,848 389,870 Equipment & Solutions 471,812 — Total goodwill $ 1,054,091 $ 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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Advanced Manufacturing Components $ 353,639 $ 426,255 $ 1,084,107 $ 1,432,931 Global Service 76,278 60,897 215,260 181,636 Advanced Manufacturing Systems 32,534 — 100,755 — $ 462,451 $ 487,152 $ 1,400,122 $ 1,614,567 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 and Other

Restructuring and Other	9 Months Ended
	Sep. 30, 2019
Expense Of Restructuring Activities And Other [Abstract]
Restructuring and Other	18) Restructuring and Other Restructuring The Company recorded restructuring charges of $1,525 and $2,990 during the three and nine months ended September 30, 2019, respectively, primarily related to severance costs as a result of an organization-wide reduction in workforce, the consolidation of service functions in Asia and the movement of certain products to low cost regions. The Company recorded restructuring charges of $1,364 and $3,374 during the three and nine months ended September Restructuring activities were as follows: Nine Months Ended 2019 2018 Beginning of period restructuring accrual $ 2,632 $ 3,244 Charged to expense 2,990 3,374 Payments and adjustments (3,074 ) (3,963 ) End of period restructuring accrual $ 2,548 $ 2,655 Other We recorded a charge of $1,700 during the nine months ended September 30, 2019 related to a legal settlement from a contractual obligation we assumed as part of our acquisition of Newport . We recorded $1,000 of environmental costs during the nine months ended September 30, 2018 related to a U.S. Environmental Protection Agency-designated Superfund site as part of our acquisition of Newport .

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	19) Commitments and Contingencies Newport Litigation In 2016, two putative class actions lawsuit captioned Dixon Chung v. Newport Corp., et al., Case No. A-16-733154-C, A-16-734039-B, 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- - Discovery in the action is complete. On August 9, 2019, plaintiffs filed a motion for leave to file a third amended complaint, which was denied on October 10, 2019. On August 23, 2019, defendants filed a motion for summary judgment. January 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 .

Sale-Leaseback of Long-Lived As

Sale-Leaseback of Long-Lived Assets	9 Months Ended
	Sep. 30, 2019
Sale Lease Back Transaction [Abstract]
Sale-Leaseback of Long-Lived Assets	20) Sale-Leaseback of Long-Lived Assets In August of 2019, the Company sold two of its buildings in Boulder, Colorado and has leased-back both buildings for a period of approximately 15 months, and also sold its three buildings in Portland, Oregon and has leased-back these three buildings with various expiration dates through 2020 and 2021. Total net cash proceeds received for these two transactions was $41,179 and the Company recognized a net gain on the sale of these long-lived assets of $6,773.

Recently Issued Accounting Pr_2

Recently Issued Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 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 the impact of pending In August 2017, the FASB issued ASU 2017-12, In February 2016, the FASB issued ASU 2016-02, 2016-02 The Company implemented internal controls and a lease accounting information system to enable preparation on adoption. Upon adoption, the Company recorded a cumulative effect of initially applying this new standard, resulting in the addition of $71,042 of right-of-use right-of-use re-classified right-of-use In June 2016, the FASB issued ASU 2016-13, the impact of pending adoption on the Company’s consolidated financial statements.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Text Block [Abstract]
Schedule Of Elements Of Lease Payments	The elements of lease expense were as follows: Three Months Nine Months Lease Cost: Operating lease cost $ 6,313 $ 17,694
Future Lease Payment Under Non-Cancelable Lease	Future lease payments under non-cancelable Amount Year Ending December 31, 2019 (remaining) $ 5,887 2020 21,569 2021 14,064 2022 8,497 2023 7,158 Thereafter 17,453 Total lease payments 74,628 Less:imputed interest 6,759 Total operating lease liabilities $ 67,869
Minimum Lease Payments under Operating Lease	Minimum lease payments under operating leases prior to adoption of ASU 2016-02 Operating Year Ending December 31, 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)	9 Months Ended
	Sep. 30, 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: Nine Months September 30, Beginning balance, January 1 (1) $ 17,474 Deferred revenue and customer advances assumed in ESI Merger 4,629 Additions to deferred revenue and customer advances 41,922 Amount of deferred revenue and customer advances recognized in (38,787 ) Ending balance, September 30 (2) $ 25,238 (1) Beginning deferred revenue and customer advances as of January 1, 2019 included $ 8,134 3,228 6,112 (2) Ending deferred revenue as of September 30, 2019 included $ 14,161 2,874 8,202
Summary of Revenue from Contracts with Customers	The following table summarizes revenue from contracts with customers: Three Months Ended September 30, 2019 Vacuum & Analysis Light & Motion Equipment & Total Net revenues: Products $ 197,203 $ 156,436 $ 32,534 $ 386,173 Services 43,478 16,024 16,776 76,278 Total net revenues $ 240,681 $ 172,460 $ 49,310 $ 462,451 Three Months Ended September 30, 201 8 Vacuum & Analysis Light & Motion Equipment & Total Net revenues: Products $ 239,924 $ 186,331 $ — $ 426,255 Services 46,114 14,783 — 60,897 Total net revenues $ 286,038 $ 201,114 $ — $ 487,152 Nine Months Ended September 30, 2019 Vacuum & Analysis Light & Motion Equipment & Total Net revenues: Products $ 581,611 $ 502,496 $ 100,755 $ 1,184,862 Services 129,080 46,531 39,649 215,260 Total net revenues $ 710,691 $ 549,027 $ 140,404 $ 1,400,122 Nine Months Ended September 30, 2018 Vacuum & Analysis Light & Motion Equipment & Total Net revenues: Products $ 865,714 567,217 $ — $ 1,432,931 Services 136,996 44,640 — 181,636 Total net revenues $ 1,002,710 $ 611,857 $ — $ 1,614,567

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 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: September 30, December 31, Available-for-sale Time deposits and certificates of deposit $ 6,262 $ 102 Bankers’ acceptance drafts 4,540 989 Asset-backed securities — 9,113 Commercial paper 44,981 19,359 Corporate obligations — 9,352 U.S. treasury obligations 3,602 13,298 U.S. agency obligations 29,462 21,613 $ 88,847 $ 73,826 Investments classified as long-term consist of the following: September 30, December 31, Available-for-sale Group insurance contracts $ 5,746 $ 5,890 Cost method investments: Minority interest in a private company 4,400 4,400 $ 10,146 $ 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 September 30 , 2019: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Short-term investments: Available-for-sale Time deposits and certificates of deposit $ 6,261 $ 1 $ — $ 6,262 Bankers’ acceptance drafts 4,540 — — 4,540 Commercial paper 45,342 — (361 ) 44,981 U.S. treasury obligations 3,601 1 — 3,602 U.S. agency obligations 29,460 4 (2 ) 29,462 $ 89,204 $ 6 $ (363 ) $ 88,847 As of September 30 , 2019: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Long-term investments: Available-for-sale Group insurance contracts $ 5,329 $ 417 $ — $ 5,746 As of December 31 , 2018: Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value 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 Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Long-term investments: Available-for-sale Group insurance contracts $ 5,546 $ 344 $ — $ 5,890

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2019 and are summarized as follows: Fair Value Measurements at Reporting Date Using Description September 30, 2019 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Cash equivalents: Money market funds $ 4,732 $ 4,732 $ — $ — Time deposits and certificates of deposit 4,651 — 4,651 — Commercial paper 40,966 — 40,966 — U.S. treasury obligations 7,999 — 7,999 — U.S. agency obligations 20,592 — 20,592 — Restricted cash – money market funds 330 330 — — Available-for-sale Time deposits and certificates of deposit 6,262 — 6,262 — Bankers’ acceptance drafts 4,540 — 4,540 — Commercial paper 44,981 — 44,981 — U.S. treasury 3,602 — 3,602 — U.S. agency obligations 29,462 — 29,462 — Group insurance contracts 5,746 — 5,746 — Derivatives – currency forward contracts 4,232 — 4,232 — Funds in investments and other assets: Israeli pension assets 16,135 — 16,135 — Deferred compensation plan assets: Mutual funds and exchange traded funds 1,832 — 1,832 — Money market securities 483 — 483 — Total assets $ 196,545 $ 5,062 $ 191,483 $ — Liabilities: Derivatives – currency forward contracts $ 308 $ — $ 308 $ — Derivatives – interest rate hedge – non-current 6,908 — 6,908 — Total liabilities $ 7,216 $ — $ 7,216 $ — Reported as follows: Assets: Cash and cash equivalents, including restricted cash (1) $ 79,270 $ 5,062 $ 74,208 $ — Short-term investments 88,847 — 88,847 — Other current assets 4,232 — 4,232 — Total current assets $ 172,349 $ 5,062 $ 167,287 $ — Long-term investments (2) $ 5,746 $ — $ 5,746 $ — Other assets 18,450 — 18,450 — Total long-term assets $ 24,196 $ — $ 24,196 $ — Liabilities: Other current liabilities $ 308 $ — $ 308 $ — Other liabilities $ 6,908 $ — $ 6,908 $ — (1) The cash and cash equivalent amounts presented in the table above do not include cash of $307,011 as of September 30, 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, Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets: Cash equivalents: Money market funds $ 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)	9 Months Ended
	Sep. 30, 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 September 30, 2019 and December 31, 2018: September 30, 2019 Currency Hedged (Buy/Sell) Gross Fair (1) U.S. Dollar/Japanese Yen $ 43,339 $ (83 ) U.S. Dollar/South Korean Won 42,082 2,191 U.S. Dollar/Euro 31,689 1,326 U.S. Dollar/U.K. Pound Sterling 7,320 382 U.S. Dollar/Taiwan Dollar 18,359 108 Total $ 142,789 $ 3,924 December 31, 2018 Currency Hedged (Buy/Sell) Gross Fair (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: September 30, December 31, Derivative assets: Foreign exchange contracts (1) $ 4,232 $ 2,485 Interest rate hedge (2) — 6,083 Derivative liabilities: Foreign exchange contracts (1) (308 ) (1,168 ) Interest rate hedge (2) (6,908 ) — Total net derivative (liability) $ (2,984 ) $ 7,400 (1) The derivative assets of $4,232 and $2,485 as of September 30, 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 $308 and $1,168 as of September 30, 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 interest rate hedge liability of $ 6,908 6,083 The net amount of existing gains as of September 30, 2019 that the Company expects to reclassify from OCI into earnings within the next twelve months is immaterial.
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 September 30, Nine Months September 30, Derivatives Designated as Cash Flow Hedging Instruments 2019 2018 2019 2018 Forward exchange contracts: Net gain (loss) recognized in OCI (1) $ (1,024 ) $ 212 $ (11,189 ) $ 10,357 Net gain (loss) reclassified from accumulated OCI into income (2) $ 2,000 $ 306 $ 4,077 $ (4,882 ) (1) Net change in the fair value of the effective portion classified in OCI. (2) Effective portion classified in cost of products for the three and nine months ended September 30, 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 September 30, Nine Months September 30, Derivatives Not Designated as Hedging Instruments 2019 2018 2019 2018 Forward exchange contracts: Net gain (loss) recognized in income (1) $ 82 $ (111 ) $ (166 ) $ 12 (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)	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consist of the following: September 30, December 31, Raw materials $ 291,613 $ 235,593 Work-in-process 84,814 61,908 Finished goods 86,836 87,188 $ 463,263 $ 384,689

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2019
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 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	Current assets (excluding inventory) $ 208,009 Inventory 83,036 Intangible assets 316,200 Goodwill 471,722 Property, plant and equipment 65,489 Long-term assets 9,633 Total assets acquired 1,154,089 Current liabilities 51,479 Non-current 32,150 Other long-term liabilities 7,159 Total liabilities assumed 90,788 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 and nine months ended September 30, 2019 include the following amounts of revenue and earnings of ESI since the acquisition date: Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Total net revenues $ 49,308 $ 140,403 Net loss $ (5,843 ) $ (40,685 ) Net loss Basic $ (0.11 ) $ (0.74 ) Diluted $ (0.11 ) $ (0.74 )
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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Total net revenues $ 462,451 $ 573,070 $ 1,414,660 $ 1,917,348 Net income $ 47,669 $ 91,111 $ 127,676 $ 357,333 Net income Basic $ 0.87 $ 1.67 $ 2.34 $ 6.55 Diluted $ 0.86 $ 1.65 $ 2.32 $ 6.48
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 $ 255,700 12 Completed technology - Non-Laser 18,300 10 Trademarks and trade names 14,400 7 Customer relationships 25,400 10 Backlog 2,400 1 $ 316,200

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	The changes in the carrying amount of goodwill and accumulated impairment loss during the nine months ended September 30, 2019 and year ended December 31, 2018 were as follows: Nine Months Ended Twelve Months Ended December 31, 2018 Gross Carrying Amount Accumulated Impairment Loss Net Gross Carrying Amount Accumulated Impairment Loss Net Beginning balance at January 1 $ 731,272 $ (144,276 ) $ 586,996 $ 735,323 $ (144,276 ) $ 591,047 Acquired goodwill (1) 471,727 — 471,727 — — — Foreign currency translation (4,632 ) — (4,632 ) (4,051 ) — (4,051 ) Ending balance at September $ 1,198,367 $ (144,276 ) $ 1,054,091 $ 731,272 $ (144,276 ) $ 586,996 (1) During the nine months ended September 30, 2019, the Company recorded $ 471,727
Intangible Assets	Intangible Assets Components of the Company’s intangible assets are comprised of the following: As of September 30, 2019 Gross Accumulated Impairment Charges Accumulated Amortization Foreign Currency Translation Net Completed technology (1) $ 446,431 $ (105 ) $ (167,816 ) $ (282 ) $ 278,228 Customer relationships (1) 308,144 (1,406 ) (79,028 ) (2,066 ) 225,644 Patents, trademarks, trade names and other (1) 120,895 — (44,036 ) 149 77,008 $ 875,470 $ (1,511 ) $ (290,880 ) $ (2,199 ) $ 580,880 (1) During the nine months ended September 30, 2019, the Company recorded $316,200 of separately identified intangible assets related to the ESI Merger, of which $274,000 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 Accumulated Impairment Charges Accumulated Amortization Foreign Currency Translation 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) $ 17,382 2020 55,392 2021 47,617 2022 45,182 2023 44,844 2024 43,927 Thereafter 270,636

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of Short-Term Debt	September 30, December 31, Short-term debt: Japanese lines of credit $ 3,627 $ 2,724 Japanese receivables financing facility 28 665 Other debt — 597 Term Loan Facility 8,968 — $ 12,623 $ 3,986
Schedule of Long-Term Debt	September 30, December 31, Long-term debt: Other debt $ 79 $ 86 Term Loan Facility, net (1) 873,371 343,756 $ 873,450 $ 343,842 (1) Net of deferred financing fees, original issuance discount and repricing fee of $12,258 and $4,708 as of September 30, 2019 and December 31, 2018, respectively .
Schedule of Contractual Maturities of Debt Obligations	Contractual maturities of the Company’s debt obligations as of September 30, 2019 are as follows: Year Amount 2019 (remaining) $ 5,897 2020 9,037 2021 8,979 2022 8,968 2023 8,968 2024 8,968 Thereafter 847,514

Product Warranties (Tables)

Product Warranties (Tables)	9 Months Ended
	Sep. 30, 2019
Guarantees and Product Warranties [Abstract]
Product Warranty Activities	Product warranty activities were as follows: Nine Months Ended 2019 2018 Beginning of period $ 10,399 $ 10,104 Assumed product warranty liability from ESI Merger 7,177 — Provision for product warranties 18,700 11,448 Direct and other charges to warranty liability (21,209 ) (11,072 ) End of period (1) $ 15,067 $ 10,480 (1) As of September 30, 2019, short-term product warranty of $12,028 and long-term product warranty of $3,039 were included within other ​​​​​​​current liabilities and other liabilities, respectively, within the accompanying condensed consolidated balance sheet. As of September 30, 2018, short-term product warranty of $10,067 and long-term product warranty of $413 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)	9 Months Ended
	Sep. 30, 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 Nine Months Ended 2019 2018 2019 2018 Numerator: Net income $ 47,428 $ 93,277 $ 97,622 $ 321,260 Denominator: Shares used in net income per common share – basic 54,945,000 54,476,000 54,636,000 54,539,000 Effect of dilutive securities: Restricted stock units, stock appreciation rights and 259,000 478,000 409,000 632,000 Shares used in net income per common share – diluted 55,204,000 54,954,000 55,045,000 55,171,000 Net income per common share: Basic $ 0.86 $ 1.71 $ 1.79 $ 5.89 Diluted $ 0.86 $ 1.70 $ 1.77 $ 5.82

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 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 Nine Months Ended 2019 2018 2019 2018 Cost of revenues $ 818 $ 170 $ 1,876 $ 2,664 Research and development expense 971 708 2,842 2,249 Selling, general and administrative expense 4,009 4,335 16,253 17,092 Acquisition and integration related expense 1,202 — 20,796 — Restructuring related expense 373 — 373 — Total pre-tax $ 7,373 $ 5,213 $ 42,140 $ 22,005
Summary of Activity for RSUs	The following table presents the activity for RSUs under the Plan: Nine Months Ended September 30, 2019 Outstanding RSUs Weighted Average Grant Date Fair Value RSUs – beginning of period 647,394 $ 74.04 Assumed shares from ESI Merger 736,133 $ 84.10 Accrued dividend shares 4,307 $ 79.20 Granted 417,335 $ 86.18 Vested (533,007 ) $ 69.11 Forfeited (134,833 ) $ 89.58 RSUs – end of period 1,137,329 $ 85.50
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: Nine Months Ended September 30, 2019 Outstanding SARs Weighted Average Grant Date Fair Value SARs – beginning of period 177,538 $ 28.52 Assumed SARs from ESI Merger 12,787 $ 17.38 Exercised (46,414 ) $ 27.07 Forfeited or expired (3,998 ) $ 23.00 SARs o 139,913 $ 28.18

Business Segment, Geographic _2

Business Segment, Geographic Area and Product Information (Tables)	9 Months Ended
	Sep. 30, 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 Nine Months Ended 2019 2018 2019 201 8 Vacuum & Analysis $ 240,681 $ 286,038 $ 710,691 $ 1,002,710 Light & Motion 172,460 201,114 549,027 611,857 Equipment & Solutions 49,310 — 140,404 — $ 462,451 $ 487,152 $ 1,400,122 $ 1,614,567 The following table sets forth segment assets by reportable segment: September 30, 2019: Vacuum & Analysis Light & Motion Equipment & Corporate, Eliminations & Other Total Segment assets: Trade accounts receivable $ 156,066 $ 159,061 $ 40,289 $ (27,433 ) $ 327,983 Inventories 221,182 168,597 73,449 35 463,263 Total segment assets $ 377,248 $ 327,658 $ 113,738 $ (27,398 ) $ 791,246 December 31, 2018: Vacuum & Analysis Light & Motion Equipment & Corporate, Eliminations & Other Total Segment assets: Trade accounts receivable $ 171,604 $ 140,658 $ — $ (16,808 ) $ 295,454 Inventories 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​​​​​​​: September 30, December 31, Reportable segment: Vacuum & Analysis $ 195,431 $ 197,126 Light & Motion 386,848 389,870 Equipment & Solutions 471,812 — Total goodwill $ 1,054,091 $ 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 Nine Months Ended 2019 2018 2019 2018 Gross profit by reportable segment: Vacuum & Analysis $ 102,826 $ 132,835 $ 303,060 $ 462,418 Light & Motion 79,873 99,025 257,562 307,174 Equipment & Solutions 22,305 — 53,527 — Total gross profit by reportable segment 205,004 231,860 614,149 769,592 Operating expenses: Research and development 41,566 31,898 122,354 103,259 Selling, general and administrative 82,101 70,822 247,792 229,952 Fees and expenses related to term loan 642 — 6,489 378 Acquisition and integration costs 2,103 36 35,510 (1,132 ) Restructuring and other 1,525 1,364 4,690 4,374 Amortization of intangible assets 17,020 10,695 50,299 32,786 Gain on sale of long-lived assets (6,773 ) — (6,773 ) — Income from operations 66,820 117,045 153,788 399,975 Interest and other expense, net 11,398 2,529 31,167 10,173 Income before income taxes 55,422 114,516 122,621 389,802 Provision for income taxes 7,994 21,239 24,999 68,542 Net income $ 47,428 $ 93,277 $ 97,622 $ 321,260
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 and nine months ended September 30, 2019 and 2018: Vacuum & Analysis Light & Motion Equipment & Total Three Months Ended September 30, 2019: Capital expenditures $ 7,461 $ 6,767 $ 2,271 $ 16,499 Nine Months Ended September 30, 2019: Capital expenditures $ 21,649 $ 16,859 $ 6,245 $ 44,753 Three Months Ended September 30, 2018: Capital expenditures $ 9,532 $ 5,535 $ — $ 15,067 Nine Months Ended September 30, 2018: Capital expenditures $ 22,701 $ 14,184 $ — $ 36,885 The following table sets forth depreciation and amortization by reportable segment for the three and nine months ended September 30, 2019 and 2018: Vacuum & Analysis Light & Motion Equipment & Total Three Months Ended September 30, 2019: Depreciation and amortization $ 4,222 $ 12,992 $ 9,994 $ 27,208 Nine Months Ended September 30, 2019 Depreciation and amortization $ 12,208 $ 40,424 $ 27,231 $ 79,863 Three Months Ended September 30, 2018: Depreciation and amortization $ 5,083 $ 14,446 $ — $ 19,529 Nine Months Ended September 30, 2018: Depreciation and amortization $ 15,180 $ 44,726 $ — $ 59,906
Reconciliation of Segment Assets to Consolidated Total Assets	The following is a reconciliation of segment assets to consolidated total assets: September 30, 2019 December 31, 2018 Total segment assets $ 791,246 $ 680,143 Cash and cash equivalents and investments 485,274 728,461 Other current assets 94,011 65,790 Property, plant and equipment, net 236,124 194,367 Right-of-use 67,632 — Goodwill and intangible assets, net 1,634,971 906,803 Other assets 45,286 38,682 Consolidated total assets $ 3,354,544 $ 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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Net revenues: United States $ 211,116 $ 243,273 $ 653,012 $ 801,811 China 46,679 35,554 140,469 98,631 Korea 41,313 43,468 116,011 164,462 Japan 32,388 38,964 105,485 151,325 Other Asia 77,360 69,782 213,325 215,282 Europe 53,595 56,111 171,820 183,056 $ 462,451 $ 487,152 $ 1,400,122 $ 1,614,567 Long-lived assets: (1) September 30, 2019 December 31, 2018 United States $ 171,324 $ 146,687 Europe 30,514 26,794 Asia 60,072 50,572 $ 261,910 $ 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 September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Advanced Manufacturing Components $ 353,639 $ 426,255 $ 1,084,107 $ 1,432,931 Global Service 76,278 60,897 215,260 181,636 Advanced Manufacturing Systems 32,534 — 100,755 — $ 462,451 $ 487,152 $ 1,400,122 $ 1,614,567

Restructuring and Other (Tables

Restructuring and Other (Tables)	9 Months Ended
	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Schedule of Company's Restructuring Activity	Restructuring activities were as follows: Nine Months Ended 2019 2018 Beginning of period restructuring accrual $ 2,632 $ 3,244 Charged to expense 2,990 3,374 Payments and adjustments (3,074 ) (3,963 ) End of period restructuring accrual $ 2,548 $ 2,655

Recently Issued Accounting Pr_3

Recently Issued Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 67,632
Short-term lease liability	20,575
Long-term lease liability	$ 47,294
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	Sep. 30, 2019USD ($)
Leases [Abstract]
Right-of-Use Asset,Operating Lease	$ 67,632
Short-term lease liability	20,575
Long-term lease liability	$ 47,294

Leases - Schedule Of Elements O

Leases - Schedule Of Elements Of Lease Expense (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 6,313	$ 17,694
Operating cash flows used for operating leases		$ 17,444
Weighted average discount rate	3.80%	3.80%
Weighted average remaining lease term	5 years	5 years

Leases - Schedule Of Future Lea

Leases - Schedule Of Future Lease Payments (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
2019 (remaining)	$ 5,887
2020	21,569
2021	14,064
2022	8,497
2023	7,158
Thereafter	17,453
Total lease payments	74,628
Less: imputed interest	6,759
Total operating lease liabilities	$ 67,869

Leases - Minimum Lease Payments

Leases - Minimum Lease Payments under Operating Leases (Detail) $ in Thousands	Sep. 30, 2019USD ($)
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	Sep. 30, 2019	Dec. 31, 2018
Accounting Standards Codification Topic 606 adjustment [Member]
Change in Contract with Customer, Liability [Line Items]
Contract assets	$ 3,405	$ 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	9 Months Ended
	Sep. 30, 2019USD ($)
Change in Contract with Customer, Liability [Line Items]
Beginning balance, January 1	$ 17,474
Additions to deferred revenue and customer advances	41,922
Amount of deferred revenue and customer advances recognized in income	(38,787)
Ending balance, September 30	25,238
Electro Scientific Industries Inc [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances assumed	$ 4,629

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	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	$ 22,363		$ 14,246
Long-term deferred revenue	2,874	$ 3,228
Deferred Revenue [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	14,161	8,134
Customer Advances [Member]
Change in Contract with Customer, Liability [Line Items]
Deferred revenue and customer advances	$ 8,202	$ 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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net revenues	$ 462,451	$ 487,152	$ 1,400,122	$ 1,614,567
Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	240,681	286,038	710,691	1,002,710
Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	172,460	201,114	549,027	611,857
Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	49,310		140,404
Products [Member]
Disaggregation of Revenue [Line Items]
Net revenues	386,173	426,255	1,184,862	1,432,931
Products [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	197,203	239,924	581,611	865,714
Products [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	156,436	186,331	502,496	567,217
Products [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	32,534		100,755
Services [Member]
Disaggregation of Revenue [Line Items]
Net revenues	76,278	60,897	215,260	181,636
Services [Member] | Vacuum & Analysis [Member]
Disaggregation of Revenue [Line Items]
Net revenues	43,478	46,114	129,080	136,996
Services [Member] | Light & Motion [Member]
Disaggregation of Revenue [Line Items]
Net revenues	16,024	$ 14,783	46,531	$ 44,640
Services [Member] | Equipment & Solutions [Member]
Disaggregation of Revenue [Line Items]
Net revenues	$ 16,776		$ 39,649

Investments - Investments Class

Investments - Investments Classified as Short-Term Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 88,847	$ 73,826
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	6,262	102
Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	4,540	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	44,981	19,359
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments		9,352
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	3,602	13,298
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale investments	$ 29,462	$ 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	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities and Cost-method Investments [Line Items]
Investments classified as long-term	$ 10,146	$ 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	5,746	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	Sep. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	$ 89,204	$ 73,994
Investments, Gross Unrealized Gains	6	7
Investments, Gross Unrealized (Losses)	(363)	(175)
Investments, Estimated Fair Value	88,847	73,826
Time Deposits and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	6,261	102
Investments, Gross Unrealized Gains	1
Investments, Estimated Fair Value	6,262	102
Bankers' Acceptance Drafts [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	4,540	989
Investments, Estimated Fair Value	4,540	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	45,342	19,504
Investments, Gross Unrealized (Losses)	(361)	(145)
Investments, Estimated Fair Value	44,981	19,359
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost		9,367
Investments, Gross Unrealized (Losses)		(15)
Investments, Estimated Fair Value		9,352
U.S. Treasury Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	3,601	13,294
Investments, Gross Unrealized Gains	1	4
Investments, Estimated Fair Value	3,602	13,298
U.S. Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	29,460	21,617
Investments, Gross Unrealized Gains	4	2
Investments, Gross Unrealized (Losses)	(2)	(6)
Investments, Estimated Fair Value	29,462	21,613
Group Insurance Contracts [Member] | Long Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments, Cost	5,329	5,546
Investments, Gross Unrealized Gains	417	344
Investments, Estimated Fair Value	$ 5,746	$ 5,890

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments classified as long-term	$ 10,146	$ 10,290
Noncontrolling Interest [Member] | Cost-method Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments classified as long-term	$ 4,400	$ 4,400

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	$ 88,847	$ 73,826
Short-term investments	88,847	73,826
Other assets	45,286	38,682
Other liabilities	3,924	1,317
Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - currency forward contracts	4,232	2,485
Derivatives - liabilities	308	1,168
Interest Rate Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives - interest rate hedge - non-current	1,180	6,083
Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	196,545	290,097
Cash and cash equivalents, including restricted cash (1)	79,270	187,405
Short-term investments	88,847	73,826
Derivatives - currency forward contracts	4,232
Total current assets	172,349	263,716
Available-for-sale investments	5,746	5,890
Other assets	18,450	20,491
Total long-term assets	24,196	26,381
Derivatives - liabilities	308	1,168
Total liabilities	7,216
Other liabilities	6,908
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	4,232	2,485
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		6,083
Derivatives – currency forward contracts	6,908
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	308	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	4,732	180,340
Restricted cash - money market funds	330	110
Deferred compensation plan assets	483
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	4,651	850
Available-for-sale investments	6,262	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	20,592	3,418
Available-for-sale investments	29,462	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	4,540	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]
Cash and cash equivalents	7,999
Available-for-sale investments	3,602	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	1,832
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	5,062	180,450
Cash and cash equivalents, including restricted cash (1)	5,062	180,450
Total current assets	5,062	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	4,732	180,340
Restricted cash - money market funds	330	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	191,483	109,647
Cash and cash equivalents, including restricted cash (1)	74,208	6,955
Short-term investments	88,847	73,826
Derivatives - currency forward contracts	4,232
Total current assets	167,287	83,266
Available-for-sale investments	5,746	5,890
Other assets	18,450	20,491
Total long-term assets	24,196	26,381
Derivatives - liabilities	308	1,168
Total liabilities	7,216
Other liabilities	6,908
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	4,232	2,485
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		6,083
Derivatives – currency forward contracts	6,908
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	308	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	483
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	4,651	850
Available-for-sale investments	6,262	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	20,592	3,418
Available-for-sale investments	29,462	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	4,540	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]
Cash and cash equivalents	7,999
Available-for-sale investments	3,602	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	1,832
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	44,981	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	40,966	2,687
Available-for-sale investments	44,981	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	40,966	2,687
Available-for-sale investments	44,981	19,359
Corporate Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments		9,352
Corporate Obligations [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments		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]
Available-for-sale investments		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	5,746
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	5,746
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	16,135	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	$ 16,135	$ 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	Sep. 30, 2019	Dec. 31, 2018
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	$ 307,011	$ 456,940

Derivatives - Additional Inform

Derivatives - Additional Information (Detail) - USD ($)	Sep. 30, 2016	Sep. 30, 2019	Apr. 03, 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		$ 142,789,000		$ 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	1.75%
Interest rate swap agreement, maturity date	Sep. 30, 2020
Interest rate swap agreement, notional amount		$ 250,000,000		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 2016 Term Loan Facility, 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 1.75% as of September 30, 2019, through September 30, 2020.
Interest rate swap agreement, fair value		$ 1,180,000		$ 6,083,000
Interest Rate Hedge [Member] | Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate swap agreement, interest rate	1.198%		2.309%
Interest rate swap agreement, credit spread rate		1.75%
Interest rate swap agreement, notional amount	$ 335,000,000	$ 300,000,000	$ 300,000,000
Interest rate swap agreement, fair value		$ 8,088,000
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	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 142,789	$ 159,394
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	3,924	1,317
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	43,339	43,770
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(83)	(478)
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	42,082	59,149
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	2,191	570
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	31,689	23,515
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	1,326	688
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	7,320	11,827
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	382	323
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	18,359	21,133
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	$ 108	$ 214

Derivatives - Summary of Fair V

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Total net derivative (liability) asset designated as hedging instruments	$ 3,924	$ 1,317
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total net derivative (liability) asset designated as hedging instruments	(2,984)	7,400
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	4,232	2,485
Derivative liabilities	(308)	(1,168)
Foreign Exchange Contracts [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	4,232	2,485
Derivative liabilities	(308)	(1,168)
Interest Rate Hedge [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative assets		$ 6,083
Derivative liabilities	$ (6,908)

Derivatives - Summary of Fair_2

Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets classified in other current assets	$ 4,232	$ 2,485
Derivative liabilities classified in other current liabilities	308	1,168
Interest Rate Hedge [Member]
Derivatives, Fair Value [Line Items]
Derivative assets in other assets		$ 6,083
Derivative liabilities in other liabilities	$ 6,908

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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in OCI	$ (1,024)	$ 212	$ (11,189)	$ 10,357
Net gain (loss) reclassified from accumulated OCI into income	$ 2,000	$ 306	$ 4,077	$ (4,882)

Derivatives - Summary of Losses

Derivatives - Summary of Losses on Derivatives Not Designated as Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Forward Exchange Contracts [Member]
Derivative Instruments Gain Loss Not Designated As Hedging Instruments [Line Items]
Net gain (loss) recognized in income	$ 82	$ (111)	$ (166)	$ 12

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 291,613	$ 235,593
Work-in-process	84,814	61,908
Finished goods	86,836	87,188
Inventories	$ 463,263	$ 384,689

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 01, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Business acquisition share price	$ 30
Stock-based compensation expense		$ 7,373		$ 5,213	$ 42,140	$ 22,005
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			$ 7,624
Incremental costs of sales charge					7,624
Fair value write-up of acquired property, plant and equipment		$ 39,267			39,267
Compensation expense					2,701
Stock-based compensation expense					$ 14,023
Electro Scientific Industries Inc [Member] | Property Plant and Equipment [Member]
Business Acquisition [Line Items]
Assets, fair value adjustment			12,600
Electro Scientific Industries Inc [Member] | Inventories [Member]
Business Acquisition [Line Items]
Assets, fair value adjustment			9,800
Electro Scientific Industries Inc [Member] | Intangible assets [Member]
Business Acquisition [Line Items]
Assets, fair value adjustment			2,400
Electro Scientific Industries Inc [Member] | Goodwill [Member]
Business Acquisition [Line Items]
Assets, fair value adjustment			$ 1,300

Acquisitions - Summary of Purch

Acquisitions - Summary of Purchase Price (Detail) - USD ($) $ in Thousands	Feb. 01, 2019	Sep. 30, 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	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquisition Date [Line Items]
Goodwill		$ 1,054,091	$ 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)	$ 208,009
Inventory	83,036
Intangible assets	316,200
Goodwill	471,722
Property, plant and equipment	65,489
Long-term assets	9,633
Total assets acquired	1,154,089
Current liabilities	51,479
Non-current deferred taxes	32,150
Other long-term liabilities	7,159
Total liabilities assumed	90,788
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 - Allocation of Ac

Acquisitions - Allocation of Acquired Intangible Assets and Related Estimates of Useful Lives (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Feb. 01, 2019	Sep. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 316,200
Completed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price			$ 274,000
Completed Technology [Member] | Lasers Products [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 255,700
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		$ 18,300
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 - Schedule of Con

Acquisitions - Schedule of Consolidated Net Revenue and Earnings (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Acquisition Date [Line Items]
Total net revenues | $	$ 49,308	$ 140,403
Net loss | $	$ (5,843)	$ (40,685)
Net loss per share:
Basic | $ / shares	$ (0.11)	$ (0.74)
Diluted | $ / shares	$ (0.11)	$ (0.74)

Acquisitions - Schedule of Unau

Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Detail) - Electro Scientific Industries Inc [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Acquisition Date [Line Items]
Total net revenues	$ 462,451	$ 573,070	$ 1,414,660	$ 1,917,348
Net income	$ 47,669	$ 91,111	$ 127,676	$ 357,333
Net income per share:
Basic	$ 0.87	$ 1.67	$ 2.34	$ 6.55
Diluted	$ 0.86	$ 1.65	$ 2.32	$ 6.48

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance, Goodwill Gross Carrying Amount	$ 731,272	$ 735,323
Acquired goodwill	471,727
Foreign currency translation, Gross Carrying Amount	(4,632)	(4,051)
Ending balance, Goodwill Gross Carrying Amount	1,198,367	731,272
Beginning balance, Accumulated Impairment Loss	(144,276)	(144,276)
Ending balance, Accumulated Impairment Loss	(144,276)	(144,276)
Beginning balance, Goodwill Net	586,996	591,047
Acquired goodwill	471,727
Foreign currency translation, Net	(4,632)	(4,051)
Ending balance, Goodwill Net	$ 1,054,091	$ 586,996

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Goodwill (Parenthetical) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Goodwill [Line Items]
Acquired goodwill	$ 471,727
Electro Scientific Industries Inc [Member]
Goodwill [Line Items]
Acquired goodwill	$ 471,727

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 875,470	$ 565,698
Impairment Charges	(1,511)	(1,511)
Accumulated Amortization	(290,880)	(244,025)
Foreign Currency Translation	(2,199)	(355)
Intangible assets, net	580,880	319,807
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	446,431	172,431
Impairment Charges	(105)	(105)
Accumulated Amortization	(167,816)	(137,283)
Foreign Currency Translation	(282)	(73)
Intangible assets, net	278,228	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	(79,028)	(63,788)
Foreign Currency Translation	(2,066)	(269)
Intangible assets, net	225,644	217,281
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	120,895	110,523
Accumulated Amortization	(44,036)	(42,954)
Foreign Currency Translation	149	(13)
Intangible assets, net	$ 77,008	$ 67,556

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Feb. 01, 2019	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 290,880		$ 290,880	$ 244,025
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	79,028		79,028	63,788
Patents, Trademarks, Trade Names and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	44,036		44,036	$ 42,954
Electro Scientific Industries Inc [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price		$ 316,200
Accumulated Amortization	316,200		316,200
Finite lived intangible asset , gross favorable lease	6,428		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		3,445
Electro Scientific Industries Inc [Member] | Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, purchase price			$ 274,000
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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 17,020	$ 10,695	$ 50,299	$ 32,786

Goodwill and Intangible Asset_7

Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2019 (remaining)	$ 17,382
2020	55,392
2021	47,617
2022	45,182
2023	44,844
2024	43,927
Thereafter	$ 270,636

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	Feb. 01, 2019	Sep. 30, 2016	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Sep. 27, 2019	Apr. 03, 2019
Debt Instrument [Line Items]
Debt instrument, prepaid principal amount			$ 525,000,000		$ 525,000,000
Term loan maturity date			Feb. 2, 2026		Feb. 2, 2026				Mar. 31, 2023
Interest expense			$ 13,542,000	$ 3,719,000	$ 35,335,000	$ 13,071,000
Interest Rate Hedge [Member]
Debt Instrument [Line Items]
Interest rate swap agreement, maturity date		Sep. 30, 2020
Interest rate swap agreement, notional amount			250,000,000		250,000,000		$ 290,000,000
Interest rate swap agreement, credit spread rate		1.75%
Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit			$ 11,581,000		$ 11,581,000
Revolving Lines of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Line of credit base interest rate					1.24%
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]
Debt instrument, interest rate					2.00%		1.75%
LIBOR floor rate			1.00%		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					1.00%		0.75%
Newport [Member] | Secured Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.75%
Newport [Member] | Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit			$ 21,308,000		$ 21,308,000
Total borrowings outstanding			3,655,000		3,655,000		$ 3,389,000
Newport [Member] | Asset Based Credit Agreement [Member]
Debt Instrument [Line Items]
Debt issuance cost capitalized			$ 785,000		$ 785,000
Contractual term					5 years
Capitalized debt issuance cost					$ 216,000
Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
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.
Debt instrument, interest rate					0.50%
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%		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] | 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		$ 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		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		$ 780,000,000
Debt instrument, interest rate terms					As of September 30, 2019, 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 0.0%, 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.
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					0.00%
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		$ 11,362,000
Newport [Member] | 2016 Term Loan Facility [Member] | Secured Debt Repricing Amendment 2 [Member] | Interest Rate Hedge [Member]
Debt Instrument [Line Items]
Interest rate swap agreement, notional amount			$ 300,000,000		$ 300,000,000				$ 300,000,000
Interest rate swap agreement, interest rate									2.309%
Interest rate swap agreement, credit spread rate			1.75%		1.75%
Interest rate swap agreement, fair value			$ 8,088,000		$ 8,088,000
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		28,747,000
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, notional amount		$ 335,000,000	$ 300,000,000		$ 300,000,000				$ 300,000,000
Interest rate swap agreement, interest rate		1.198%							2.309%
Interest rate swap agreement, credit spread rate			1.75%		1.75%
Interest rate swap agreement, fair value			$ 1,180,000		$ 1,180,000
Newport [Member] | 2019 Incremental Term Loan Facility [Member] | Secured Debt Repricing Amendment 1 [Member]
Debt Instrument [Line Items]
Secured term loan, face amount			$ 894,597,000		$ 894,597,000
Debt instrument, interest rate					3.59%
Debt instrument, prepaid principal amount					$ 10,403,000
Term loan maturity date			Feb. 2, 2026		Feb. 2, 2026
Debt instrument, pre-payment premium percentage			1.00%		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
Newport [Member] | 2019 Term Loan Refinancing Facility [Member]
Debt Instrument [Line Items]
Deferred finance fees, original issue discount and re-pricing fee, gross			$ 12,258,000		$ 12,258,000
Newport [Member] | 2019 Term Loan Refinancing Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.75%
Newport [Member] | 2019 Term Loan Refinancing Facility [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured term loan, face amount								$ 896,839,000
Debt instrument, interest rate terms					The 2019 Term Loan Refinancing Facility matures on February 2, 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 0.75% with respect to base rate borrowings and 1.75% with respect to LIBOR borrowings. The 2019 Term Loan Refinancing Facility was issued with original issue discount of 0.25% of the principal amount thereof.
Debt instrument, issue discount percentage on principal					0.25%
Debt instrument, prepaid principal amount								$ 50,000,000
Electro Scientific Industries Inc [Member] | 2019 Incremental Term Loan Facility [Member] | Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Debt instrument, issue discount percentage on principal	1.00%
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	$ 650,000,000
Electro Scientific Industries Inc [Member] | 2019 Incremental Term Loan Facility [Member] | Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Debt instrument, interest rate terms	Prior to the effectiveness of Amendment No. 6 (as defined below), the 2019 Incremental Term Loan Facility had a maturity date of February 1, 2026 and bore 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.
Term loan maturity date	Feb. 1, 2026
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	Sep. 30, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Short term debt	$ 12,623	$ 3,986
Term Loan Facility [Member]
Short-term Debt [Line Items]
Short term debt	8,968
Japan [Member] | Line of Credit [Member]
Short-term Debt [Line Items]
Short term debt	3,627	2,724
Japan [Member] | Receivables Financing Facility [Member]
Short-term Debt [Line Items]
Short term debt	$ 28	665
Austrian [Member] | Loans Due Through March 2020 and other debt [Member]
Short-term Debt [Line Items]
Short term debt		$ 597

Debt - Schedule of Long Term De

Debt - Schedule of Long Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long term debt	$ 873,450	$ 343,842
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Long term debt	873,371	343,756
Loans Due Through March 2020 and other debt [Member] | Austrian [Member]
Debt Instrument [Line Items]
Long term debt	$ 79	$ 86

Debt - Schedule of Long Term _2

Debt - Schedule of Long Term Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Term Loan Facility, Net [Member]
Debt Instrument [Line Items]
Deferred financing fees, original issuance discount and re-pricing fee	$ 12,258	$ 4,708

Debt - Schedule of Contractual

Debt - Schedule of Contractual Maturities of Debt Obligations (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Maturities of Long-term Debt [Abstract]
2019 (remaining)	$ 5,897
2020	9,037
2021	8,979
2022	8,968
2023	8,968
2024	8,968
Thereafter	$ 847,514

Product Warranties - Product Wa

Product Warranties - Product Warranty Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Product Warranty Liability [Line Items]
Beginning balance	$ 10,399	$ 10,104
Provision for product warranties	18,700	11,448
Direct and other charges to warranty liability	(21,209)	(11,072)
Ending balance	15,067	$ 10,480
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	Sep. 30, 2019	Sep. 30, 2018
Guarantees [Abstract]
Short-term product warranty	$ 12,028	$ 10,067
Long-term product warranty	$ 3,039	$ 413

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	14.40%		18.50%		20.40%	17.60%
Accrued interest on unrecognized tax benefits	$ 581				$ 581		$ 568
Gross unrecognized tax benefits excluding interest and penalties	41,170				41,170		$ 32,684
Net unrecognized tax benefits excluding interest and penalties	$ 33,415				33,415
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions					1,225
Income Tax Reconciliation Nondeductible Expense Executive Compensation					$ 5,023
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		9.80%		7.50%	3.80%

Net Income Per Share - Computat

Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 47,428	$ 37,739	$ 12,455	$ 93,277	$ 122,862	$ 105,121	$ 97,622	$ 321,260
Denominator:
Shares used in net income per common share - basic	54,945,000			54,476,000			54,636,000	54,539,000
Effect of dilutive securities:
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan	259,000			478,000			409,000	632,000
Shares used in net income per common share - diluted	55,204,000			54,954,000			55,045,000	55,171,000
Net income per common share:
Basic	$ 0.86			$ 1.71			$ 1.79	$ 5.89
Diluted	$ 0.86			$ 1.70			$ 1.77	$ 5.82

Net Income Per Share - Addition

Net Income Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restricted Stock Units (RSUs) [Member]
Earnings Per Share [Line Items]
Number of shares excluded from computation of diluted earnings per share	204,000	159,800	165,000	68,800

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	Apr. 29, 2016	Sep. 30, 2019	Sep. 30, 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		$ 30,795
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, granted		417,335	260,341
Restricted stock units, weighted average grant date fair value		$ 86.18	$ 112.49
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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 7,373	$ 5,213	$ 42,140	$ 22,005
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	818	170	1,876	2,664
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	971	708	2,842	2,249
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	4,009	$ 4,335	16,253	$ 17,092
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	1,202		20,796
Restructuring Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-tax stock-based compensation expense	$ 373		$ 373

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Activity for RSUs (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 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	417,335	260,341
Vested	(533,007)
Forfeited	(134,833)
RSUs/SARs - end of period	1,137,329
RSUs/SARs, Weighted Average Grant Date Fair Value, Beginning of period	$ 74.04
Weighted Average Grant Date Fair Value, Granted	86.18	$ 112.49
Weighted Average Grant Date Fair Value, Vested	69.11
Weighted Average Grant Date Fair Value, Forfeited	89.58
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period	$ 85.50
Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued dividend shares	4,307
Weighted Average Grant Date Fair Value, Accrued dividend shares	$ 79.20
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]	9 Months Ended
	Sep. 30, 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	(46,414)
Forfeited or expired, outstanding SARs | shares	(3,998)
RSUs/SARs - end of period | shares	139,913
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	27.07
Forfeited or expired, Weighted Average Grant Date Fair Value | $ / shares	23
RSUs/SARs, Weighted Average Grant Date Fair Value, end of period | $ / shares	$ 28.18

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)	Oct. 31, 2019	Jul. 25, 2011	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		2,588,000	0			818,131			0	0
Value of shares repurchased		$ 127,000,000				$ 75,000,000				$ 75,000,000
Cash dividends per common share			$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.18	$ 0.60	$ 0.58
Dividend payment to common shareholders									$ 32,621,000	$ 31,608,000
Average price of repurchased shares						$ 91.67				$ 91.67
Common Stock [Member]
Stockholders Equity [Line Items]
Stock repurchase, shares						818,000				818,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Oct. 28, 2019
Cash dividend to be paid	$ 0.20
Dividend to be paid date	Dec. 6, 2019
Dividend declared, shareholders of record date	Nov. 25, 2019

Business Segment, Geographic _3

Business Segment, Geographic Area and Product Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019SegmentProduct
Segment Reporting [Abstract]
Number of reportable segments | Segment	2
Number of product groups | Product	3

Business Segment, Geographic _4

Business Segment, Geographic Area and Product Information - Net Revenues by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 462,451	$ 487,152	$ 1,400,122	$ 1,614,567
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Net revenues	240,681	286,038	710,691	1,002,710
Light & Motion [Member]
Segment Reporting Information [Line Items]
Net revenues	172,460	$ 201,114	549,027	$ 611,857
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 49,310		$ 140,404

Business Segment, Geographic _5

Business Segment, Geographic Area and Product Information - Reconciliation of Segment Gross Profit to Consolidated Net Income (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended						9 Months Ended
	Aug. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Gross profit		$ 205,004			$ 231,860			$ 614,149	$ 769,592
Research and development		41,566			31,898			122,354	103,259
Selling, general and administrative		82,101			70,822			247,792	229,952
Fees and expenses related to term loan		642						6,489	378
Acquisition and integration costs		2,103			36			35,510	(1,132)
Restructuring and other		1,525			1,364			4,690	4,374
Amortization of intangible assets		17,020			10,695			50,299	32,786
Gain on sale of long-lived asset	$ (6,773)	(6,773)						(6,773)
Income from operations		66,820			117,045			153,788	399,975
Interest and other expense, net		11,398			2,529			31,167	10,173
Income before income taxes		55,422			114,516			122,621	389,802
Provision for income taxes		7,994			21,239			24,999	68,542
Net income		47,428	$ 37,739	$ 12,455	93,277	$ 122,862	$ 105,121	97,622	321,260
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Gross profit		102,826			132,835			303,060	462,418
Light & Motion [Member]
Segment Reporting Information [Line Items]
Gross profit		79,873			$ 99,025			257,562	$ 307,174
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Gross profit		$ 22,305						$ 53,527

Business Segment, Geographic _6

Business Segment, Geographic Area and Product Information - Schedule of Capital Expenditures, Depreciation and Amortization Expense of Intangible Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Capital expenditures	$ 16,499	$ 15,067	$ 44,753	$ 36,885
Depreciation and amortization	27,208	19,529	79,863	59,906
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Capital expenditures	7,461	9,532	21,649	22,701
Depreciation and amortization	4,222	5,083	12,208	15,180
Light & Motion [Member]
Segment Reporting Information [Line Items]
Capital expenditures	6,767	5,535	16,859	14,184
Depreciation and amortization	12,992	$ 14,446	40,424	$ 44,726
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Capital expenditures	2,271		6,245
Depreciation and amortization	$ 9,994		$ 27,231

Business Segment, Geographic _7

Business Segment, Geographic Area and Product Information - Segment Assets by Reportable Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Trade accounts receivable	$ 327,983	$ 295,454
Inventories	463,263	384,689
Total assets	3,354,544	2,614,246
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	156,066	171,604
Inventories	221,182	222,965
Total assets	377,248	394,569
Light & Motion [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	159,061	140,658
Inventories	168,597	161,658
Total assets	327,658	302,316
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	40,289
Inventories	73,449
Total assets	113,738
Operating Segments [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	327,983	295,454
Inventories	463,263	384,689
Total assets	791,246	680,143
Corporate, Eliminations & Other [Member]
Segment Reporting Information [Line Items]
Trade accounts receivable	(27,433)	(16,808)
Inventories	35	66
Total assets	$ (27,398)	$ (16,742)

Business Segment, Geographic _8

Business Segment, Geographic Area and Product Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	$ 3,354,544	$ 2,614,246
Other current assets	94,011	65,790
Property, plant and equipment, net	236,124	194,367
Other assets	45,286	38,682
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Consolidated total assets	791,246	680,143
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents and investments	485,274	728,461
Other current assets	94,011	65,790
Property, plant and equipment, net	236,124	194,367
Right-of-use asset	67,632
Goodwill and intangible assets, net	1,634,971	906,803
Other assets	$ 45,286	$ 38,682

Business Segment, Geographic _9

Business Segment, Geographic Area and Product Information - Schedule of Net Revenues and Long-Lived Assets by Geographic Regions (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 462,451	$ 487,152	$ 1,400,122	$ 1,614,567
Long-lived assets	261,910		261,910		$ 224,053
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	211,116	243,273	653,012	801,811
Long-lived assets	171,324		171,324		146,687
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	46,679	35,554	140,469	98,631
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	41,313	43,468	116,011	164,462
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	32,388	38,964	105,485	151,325
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	53,595	56,111	171,820	183,056
Long-lived assets	30,514		30,514		26,794
Other Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	77,360	$ 69,782	213,325	$ 215,282
Long-lived assets	$ 60,072		$ 60,072		$ 50,572

Business Segment, Geographic_10

Business Segment, Geographic Area and Product Information - Summary of Goodwill Associated with Reportable Segments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Goodwill	$ 1,054,091	$ 586,996	$ 591,047
Vacuum & Analysis [Member]
Segment Reporting Information [Line Items]
Goodwill	195,431	197,126
Light & Motion [Member]
Segment Reporting Information [Line Items]
Goodwill	386,848	$ 389,870
Equipment & Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 471,812

Business Segment, Geographic_11

Business Segment, Geographic Area and Product Information - Worldwide Net Revenue for Each Group of Products (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue from External Customer [Line Items]
Net revenues	$ 462,451	$ 487,152	$ 1,400,122	$ 1,614,567
Advanced Manufacturing Components [Member]
Revenue from External Customer [Line Items]
Net revenues	353,639	426,255	1,084,107	1,432,931
Global Service [Member]
Revenue from External Customer [Line Items]
Net revenues	76,278	$ 60,897	215,260	$ 181,636
Advanced Manufacturing Systems [Member]
Revenue from External Customer [Line Items]
Net revenues	$ 32,534		$ 100,755

Restructuring and Other - Addit

Restructuring and Other - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring charges	$ 1,525	$ 1,364	$ 2,990	$ 3,374
Environmental costs				$ 1,000
Newport [Member]
Contractual Obligation	$ 1,700		$ 1,700

Restructuring and Other - Sched

Restructuring and Other - Schedule of Company's Restructuring Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring and Related Activities [Abstract]
Beginning of period restructuring accrual			$ 2,632	$ 3,244
Charged to expense	$ 1,525	$ 1,364	2,990	3,374
Payments and adjustments			(3,074)	(3,963)
End of period restructuring accrual	$ 2,548	$ 2,655	$ 2,548	$ 2,655

Sale-Leaseback of Long-Lived _2

Sale-Leaseback of Long-Lived Assets - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2019	Sep. 30, 2019	Sep. 30, 2019
Net Cash proceeds on sale of buildings	$ 41,179
Gain on sale of long-lived assets	$ 6,773	$ 6,773	$ 6,773