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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Net sales from product groups	$ 573,140	$ 480,757	$ 1,127,415	$ 917,910
Analytical and Control Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	31,493	32,801	65,205	64,621
Power Plasma and Reactive Gas Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	187,765	142,639	354,817	265,439
Vacuum Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	149,070	134,379	296,650	257,743
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	70,663	52,299	145,460	97,243
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	57,200	50,706	111,579	97,211
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 76,949	$ 67,933	$ 153,704	$ 135,653

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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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