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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue from External Customer [Line Items]
Net sales from product groups	$ 486,267	$ 380,660	$ 1,404,177	$ 890,202
Analytical and Control Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	33,068	29,989	97,689	80,754
Materials Delivery Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	45,614	36,243	136,366	97,914
Power Plasma and Reactive Gas Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	148,194	98,772	413,633	259,731
Pressure and Vacuum Measurement Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	81,300	64,163	248,291	181,808
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	56,623	45,597	153,866	83,533
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	52,548	44,331	149,759	79,594
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 68,920	$ 61,565	$ 204,573	$ 106,868

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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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