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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Major Customer [Line Items]                      
Total net sales $ 716,294 $ 577,278 $ 599,162 $ 513,862 $ 715,019 $ 578,021 $ 596,219 $ 530,670 $ 2,406,596 $ 2,419,929 $ 2,309,078
Pharmaceutical [Member]                      
Revenue, Major Customer [Line Items]                      
Total net sales                 1,365,275 1,365,731 1,294,668
Industrial [Member]                      
Revenue, Major Customer [Line Items]                      
Total net sales                 719,377 737,144 721,088
Academic and governmental [Member]                      
Revenue, Major Customer [Line Items]                      
Total net sales                 $ 321,944 $ 317,054 $ 293,322