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Business Segment Information - Summary of Net Sales for Company's Products and Services (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | $ 578,021 | $ 565,584 | $ 1,704,910 | $ 1,621,803
Waters Instrument Systems [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 238,986 | 238,431 | 677,017 | 674,768
Chemistry Consumables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 95,979 | 92,879 | 293,818 | 271,606
TA Instrument Systems [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 43,557 | 44,240 | 135,673 | 126,310
Product [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 378,522 | 375,550 | 1,106,508 | 1,072,684
Waters Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 180,830 | 172,594 | 543,411 | 498,736
TA Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 18,669 | 17,440 | 54,991 | 50,383
Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | $ 199,499 | $ 190,034 | $ 598,402 | $ 549,119

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