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Summary of Operating Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income And Expenses [Abstract]      
Selling $ 42,389 $ 45,121 $ 39,585
General and administrative 48,828 46,593 42,981
Research, product development and regulatory 26,310 24,070 26,428
Freight, delivery and warehousing 36,812 35,349 34,616
Operating expenses $ 154,339 $ 151,133 $ 143,610