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Business Segment, Geographic Area, Product and Significant Customer Information - Worldwide Net Revenue for Each Group of Products (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Net sales from product groups	$ 460,541	$ 487,152	$ 573,140	$ 554,275	$ 511,800	$ 486,267	$ 480,757	$ 437,153	$ 2,075,108	$ 1,915,977	$ 1,295,342
Analytical and Control Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									116,183	131,376	115,758
Power Plasma and Reactive Gas Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									610,111	564,343	367,665
Vacuum Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									534,568	511,738	388,868
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									274,815	225,168	124,432
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									227,577	203,775	124,218
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									$ 311,854	$ 279,577	$ 174,401

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 606
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