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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 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]                      
Total net sales $ 836,449 $ 659,233 $ 681,647 $ 608,545 $ 786,658 $ 593,784 $ 519,984 $ 464,939 $ 2,785,874 $ 2,365,365 $ 2,406,596
Chemistry Consumables [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 507,209 432,080 412,018
Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 963,804 868,032 839,407
Net Sales Recognized at a Point in Time: [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 2,176,736 1,863,109 1,890,436
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 1,314,861 1,065,253 1,155,171
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 507,209 432,080 412,018
Net Sales Recognized at a Point in Time: [Member] | Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 354,666 365,776 323,247
Net Sales Recognized Over Time: [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 2,785,874 2,365,365 2,406,596
Net Sales Recognized Over Time: [Member] | Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 $ 609,138 $ 502,256 $ 516,160