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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
Mar. 28, 2020
Mar. 30, 2019
Disaggregation of Revenue [Line Items]    
Total net sales $ 464,939 $ 513,862
Chemistry Consumables [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 97,245 99,253
Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 190,756 193,359
Net Sales Recognized at a Point in Time: [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 341,925 393,262
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 176,938 221,250
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 97,245 99,253
Net Sales Recognized at a Point in Time: [Member] | Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales 67,742 72,759
Net Sales Recognized Over Time: [Member] | Service [Member]    
Disaggregation of Revenue [Line Items]    
Total net sales $ 123,014 $ 120,600