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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups | $ 511,800 | $ 486,267 | $ 480,757 | $ 437,153 | $ 405,140 | $ 380,660 | $ 325,861 | $ 183,681 | $ 1,915,977 | $ 1,295,342 | $ 813,524
Analytical and Control Solutions Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | 131,376 | 115,758 | 102,658
Power Plasma and Reactive Gas Solutions Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | 564,343 | 367,665 | 350,469
Vacuum Solutions Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | 511,738 | 388,868 | $ 360,397
Laser Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | 225,168 | 124,432 |
Optics Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | 203,775 | 124,218 |
Photonics Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales from product groups |  |  |  |  |  |  |  |  | $ 279,577 | $ 174,401 |

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