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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. 30, 2023
Oct. 01, 2022
Sep. 30, 2023
Oct. 01, 2022
Disaggregation of Revenue [Line Items]        
Total net sales $ 711,692 $ 708,555 $ 2,136,942 $ 2,113,446
Chemistry Consumables [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 128,650 128,096 398,084 385,661
Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 263,611 243,632 774,478 728,053
Net Sales Recognized at a Point in Time: [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 536,626 554,647 1,631,928 1,652,467
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 319,431 336,827 964,380 999,732
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 128,650 128,096 398,084 385,661
Net Sales Recognized at a Point in Time: [Member] | Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 88,545 89,724 269,464 267,074
Net Sales Recognized Over Time: [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 711,692 708,555 2,136,942 2,113,446
Net Sales Recognized Over Time: [Member] | Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales $ 175,066 $ 153,908 $ 505,014 $ 460,979