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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Net sales from product groups	$ 480,757	$ 325,861	$ 917,910	$ 509,542
Analytical and Control Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	32,801	27,787	64,621	50,765
Materials Delivery Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	47,298	34,162	90,752	61,671
Power Plasma and Reactive Gas Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	142,639	83,844	265,439	160,961
Pressure and Vacuum Measurement Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	87,081	61,566	166,991	117,643
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	52,299	37,936	97,243	37,936
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	50,706	35,263	97,211	35,263
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 67,933	$ 45,303	$ 135,653	$ 45,303

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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