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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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