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Summary of Operating Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Income And Expenses [Abstract]      
Selling $ 39,585 $ 29,112 $ 27,442
General and administrative 42,981 37,660 32,128
Research, product development and regulatory 26,428 26,076 21,298
Freight, delivery and warehousing 34,616 27,750 26,880
Operating expenses $ 143,610 $ 120,598 $ 107,748