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Business Segment, Geographic Area, Product and Significant Customer Information - Net Revenues by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | $ 486,267 | $ 380,660 | $ 1,404,177 | $ 890,202
Vacuum & Analysis [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | 308,176 | 229,167 | 895,979 | 620,207
Light & Motion [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | $ 178,091 | $ 151,493 | $ 508,198 | $ 269,995

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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