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Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue | $ 460,541 | $ 487,152 | $ 573,140 | $ 554,275 | $ 511,800 | $ 486,267 | $ 480,757 | $ 437,153 | $ 2,075,108 | $ 1,915,977 | $ 1,295,342
Vacuum & Analysis [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  | 1,260,862 | 1,207,457 | 872,291
Light & Motion [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  | 814,246 | 708,520 | 423,051
Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  | 1,835,202 | 1,701,301 | 1,118,579
Products [Member] | Vacuum & Analysis [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  | 1,080,343 | 1,047,639 | 731,364
Products [Member] | Light & Motion [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  | 754,859 | 653,662 | 387,215
Services [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  | 239,906 | 214,676 | 176,763
Services [Member] | Vacuum & Analysis [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  | 180,519 | 159,818 | 140,927
Services [Member] | Light & Motion [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  | $ 59,387 | $ 54,858 | $ 35,836

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