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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue from External Customer [Line Items]
Net sales from product groups	$ 380,660	$ 209,332	$ 890,202	$ 641,137
Instruments, Control & Vacuum Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	114,491	98,614	317,141	319,491
Power & Reactive Gas Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	98,827	95,311	259,797	276,787
Analytical Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	15,907	$ 15,407	43,334	$ 44,859
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	62,226		108,090
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	44,331		79,594
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 44,878		$ 82,246

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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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