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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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue from External Customer [Line Items]
Net sales from product groups	$ 209,332	$ 186,798	$ 641,137	$ 577,848
Instruments, Control and Vacuum Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	98,614	93,027	319,491	284,934
Power and Reactive Gas Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	95,311	79,228	276,787	249,190
Analytical Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups	$ 15,407	$ 14,543	$ 44,859	$ 43,724

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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=26872669&loc=d3e20235-122688

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