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Business Segment Information - Summary of Net Sales by Customer Class (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
Revenue, Major Customer [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
Pharmaceutical [Member]                      
Revenue, Major Customer [Line Items]                      
Total net sales                 1,386,966 1,365,275 1,365,731
Industrial [Member]                      
Revenue, Major Customer [Line Items]                      
Total net sales                 707,772 719,377 737,144
Academic and governmental [Member]                      
Revenue, Major Customer [Line Items]                      
Total net sales                 $ 270,627 $ 321,944 $ 317,054