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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 380,660 | $ 209,332 | $ 890,202 | $ 641,137
Instruments, Control & Vacuum Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 114,491 | 98,614 | 317,141 | 319,491
Power & Reactive Gas Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 98,827 | 95,311 | 259,797 | 276,787
Analytical Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 15,907 | $ 15,407 | 43,334 | $ 44,859
Photonics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 62,226 |  | 108,090 |
Optics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 44,331 |  | 79,594 |
Lasers Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 44,878 |  | $ 82,246 |

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