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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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue from External Customer [Line Items]
Net sales from product groups	$ 325,861	$ 217,966	$ 509,542	$ 431,805
Instruments, Control & Vacuum Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	108,172	110,441	202,650	220,877
Power & Reactive Gas Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	83,854	92,977	160,970	181,476
Analytical Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	15,340	$ 14,548	27,427	$ 29,452
Photonics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	45,864		45,864
Optics Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	35,263		35,263
Lasers Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 37,368		$ 37,368

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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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