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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								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Net sales from product groups	$ 172,387	$ 209,332	$ 217,966	$ 213,839	$ 203,021	$ 186,798	$ 184,697	$ 206,353	$ 813,524	$ 780,869	$ 669,420
Instruments, Control and Vacuum Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									402,345	383,863	341,375
Power and Reactive Gas Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									350,469	335,271	273,357
Analytical Solutions Products [Member]
Revenue from External Customer [Line Items]
Net sales from product groups									$ 60,710	$ 61,735	$ 54,688

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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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