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Business Segment Information - Summary of Net Sales for Company's Products and Services (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Total net sales $ 786,658 $ 593,784 $ 519,984 $ 464,939 $ 716,294 $ 577,278 $ 599,162 $ 513,862 $ 2,365,365 $ 2,406,596 $ 2,419,929
Waters Instrument Systems [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 890,855 963,871 1,000,625
Chemistry Consumables [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 432,080 412,018 400,287
TA Instrument Systems [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 174,398 191,300 204,081
Product [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 1,497,333 1,567,189 1,604,993
Waters Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 794,189 761,594 738,433
TA Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 73,843 77,813 76,503
Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 $ 868,032 $ 839,407 $ 814,936