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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
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 487,152 | $ 486,267 | $ 1,614,567 | $ 1,404,177
Analytical and Control Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 26,727 | 33,068 | 91,932 | 97,689
Power Plasma and Reactive Gas Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 132,469 | 193,808 | 487,286 | 549,999
Vacuum Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 126,842 | 81,300 | 423,492 | 248,291
Lasers Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 63,999 | 56,623 | 209,459 | 153,866
Optics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 57,836 | 52,548 | 169,415 | 149,759
Photonics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 79,279 | $ 68,920 | $ 232,983 | $ 204,573

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