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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
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Mar. 31, 2017 | Mar. 31, 2016
Revenue from External Customer [Line Items] |  |
Net sales from product groups | $ 437,153 | $ 183,681
Analytical and Control Solutions Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales from product groups | 31,820 | 22,978
Materials Delivery Solutions Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales from product groups | 43,454 | 27,509
Power Plasma and Reactive Gas Solutions Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales from product groups | 122,800 | 77,116
Pressure and Vacuum Measurement Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales from product groups | 79,910 | $ 56,078
Lasers Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales from product groups | 44,944 |
Optics Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales from product groups | 46,505 |
Photonics Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales from product groups | $ 67,720 |

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