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Summary of Operating Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Income And Expenses [Abstract]      
Selling $ 27,442 $ 27,052 $ 31,593
General and administrative 32,128 28,516 27,057
Research, product development and regulatory 21,298 19,116 21,206
Freight, delivery and warehousing 26,880 25,694 27,930
Operating expenses $ 107,748 $ 100,378 $ 107,786