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Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | $ 474,110 | $ 573,140 | $ 937,671 | $ 1,127,415
Vacuum & Analysis [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 235,655 | 368,328 | 470,010 | 716,672
Light & Motion [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 182,579 | 204,812 | 376,567 | 410,743
Equipment & Solutions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 55,876 |  | 91,094 |
Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 401,326 | 509,999 | 798,689 | 1,006,676
Products [Member] | Vacuum & Analysis [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 191,760 | 321,454 | 384,408 | 625,790
Products [Member] | Light & Motion [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 167,363 | 188,545 | 346,060 | 380,886
Products [Member] | Equipment & Solutions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 42,203 |  | 68,221 |
Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 72,784 | 63,141 | 138,982 | 120,739
Services [Member] | Vacuum & Analysis [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 43,895 | 46,874 | 85,602 | 90,882
Services [Member] | Light & Motion [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | 15,216 | $ 16,267 | 30,507 | $ 29,857
Services [Member] | Equipment & Solutions [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenues | $ 13,673 |  | $ 22,873 |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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