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Business Segment Information - Summary of Net Sales for Company's Products and Services (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Disaggregation of Revenue [Line Items]    
Total net sales $ 608,545 $ 464,939
Waters Instrument Systems [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 216,072 142,829
Chemistry Consumables [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 118,974 97,245
TA Instrument Systems [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 46,976 34,109
Product [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 382,022 274,183
Waters Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 206,832 174,137
TA Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 19,691 16,619
Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales $ 226,523 $ 190,756