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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 217,966 | $ 184,697 | $ 431,805 | $ 391,050
Instruments, Control and Vacuum Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 110,441 | 90,250 | 220,877 | 191,907
Power and Reactive Gas Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 92,977 | 79,360 | 181,476 | 169,962
Analytical Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 14,548 | $ 15,087 | $ 29,452 | $ 29,181

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