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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 486,267 | $ 380,660 | $ 1,404,177 | $ 890,202
Analytical and Control Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 33,068 | 29,989 | 97,689 | 80,754
Materials Delivery Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 45,614 | 36,243 | 136,366 | 97,914
Power Plasma and Reactive Gas Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 148,194 | 98,772 | 413,633 | 259,731
Pressure and Vacuum Measurement Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 81,300 | 64,163 | 248,291 | 181,808
Lasers Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 56,623 | 45,597 | 153,866 | 83,533
Optics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 52,548 | 44,331 | 149,759 | 79,594
Photonics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 68,920 | $ 61,565 | $ 204,573 | $ 106,868

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