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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
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 573,140 | $ 480,757 | $ 1,127,415 | $ 917,910
Analytical and Control Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 31,493 | 32,801 | 65,205 | 64,621
Power Plasma and Reactive Gas Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 187,765 | 142,639 | 354,817 | 265,439
Vacuum Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 149,070 | 134,379 | 296,650 | 257,743
Lasers Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 70,663 | 52,299 | 145,460 | 97,243
Optics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 57,200 | 50,706 | 111,579 | 97,211
Photonics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 76,949 | $ 67,933 | $ 153,704 | $ 135,653

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