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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
Apr. 03, 2021
Mar. 28, 2020
Disaggregation of Revenue [Line Items]    
Total net sales $ 608,545 $ 464,939
Chemistry Consumables [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 118,974 97,245
Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 226,523 190,756
Net Sales Recognized at a Point in Time: [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 461,309 341,925
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 263,048 176,938
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 118,974 97,245
Net Sales Recognized at a Point in Time: [Member] | Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 79,287 67,742
Net Sales Recognized Over Time: [Member] | Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales $ 147,236 $ 123,014