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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 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Disaggregation of Revenue [Line Items]        
Total net sales $ 593,784 $ 577,278 $ 1,578,707 $ 1,690,302
Chemistry Consumables [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 108,175 100,256 300,525 299,801
Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 217,545 206,705 613,365 611,961
Net Sales Recognized at a Point in Time: [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 468,384 445,813 1,204,096 1,311,147
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 268,064 270,317 664,817 778,540
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 108,175 100,256 300,525 299,801
Net Sales Recognized at a Point in Time: [Member] | Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 92,145 75,240 238,754 232,806
Net Sales Recognized Over Time: [Member] | Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales $ 125,400 $ 131,465 $ 374,611 $ 379,155