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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Total net sales $ 786,658 $ 593,784 $ 519,984 $ 464,939 $ 716,294 $ 577,278 $ 599,162 $ 513,862 $ 2,365,365 $ 2,406,596 $ 2,419,929
Chemistry Consumables [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 432,080 412,018 400,287
Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 868,032 839,407 814,936
Net Sales Recognized at a Point in Time: [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 1,863,109 1,890,436 1,922,542
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 1,065,253 1,155,171 1,204,706
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 432,080 412,018 400,287
Net Sales Recognized at a Point in Time: [Member] | Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 365,776 323,247 317,549
Net Sales Recognized Over Time: [Member] | Service [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales                 $ 502,256 $ 516,160 $ 497,387