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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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue from External Customer [Line Items]
Net sales from product groups	$ 487,152	$ 486,267	$ 1,614,567	$ 1,404,177
Analytical and Control Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	26,727	33,068	91,932	97,689
Power Plasma and Reactive Gas Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	132,469	193,808	487,286	549,999
Vacuum Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	126,842	81,300	423,492	248,291
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	63,999	56,623	209,459	153,866
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	57,836	52,548	169,415	149,759
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 79,279	$ 68,920	$ 232,983	$ 204,573

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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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