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Business Segment Information - Summary of Net Sales of Company Recognized at a Point in Time Versus Over Time (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | $ 577,278 | $ 578,021 | $ 1,690,302 | $ 1,704,910
Chemistry Consumables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 100,256 | 95,979 | 299,801 | 293,818
Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 206,705 | 199,499 | 611,961 | 598,402
Net Sales Recognized at a Point in Time: [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 445,813 | 454,291 | 1,311,147 | 1,335,193
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 270,317 | 282,543 | 778,540 | 812,690
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 100,256 | 95,979 | 299,801 | 293,818
Net Sales Recognized at a Point in Time: [Member] | Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 75,240 | 75,769 | 232,806 | 228,685
Net Sales Recognized Over Time: [Member] | Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | $ 131,465 | $ 123,730 | $ 379,155 | $ 369,717

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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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