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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 480,757 | $ 325,861 | $ 917,910 | $ 509,542
Analytical and Control Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 32,801 | 27,787 | 64,621 | 50,765
Materials Delivery Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 47,298 | 34,162 | 90,752 | 61,671
Power Plasma and Reactive Gas Solutions Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 142,639 | 83,844 | 265,439 | 160,961
Pressure and Vacuum Measurement Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 87,081 | 61,566 | 166,991 | 117,643
Lasers Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 52,299 | 37,936 | 97,243 | 37,936
Optics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | 50,706 | 35,263 | 97,211 | 35,263
Photonics Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales from product groups | $ 67,933 | $ 45,303 | $ 135,653 | $ 45,303

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