Schedule of Estimated Accrued Rebates Reserve for Cash Discounts and Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accrued Rebates
Supplemental Balance Sheet Information [Line Items]
Balance at Beginning of Period	$ 14,859	$ 10,429	$ 9,625
Provision for Current Period Sales	45,356	24,431	18,872
Provision/(Reversals) for Prior Period Sales	(1,245)	(1,159)	(1,169)
Actual Charges Related to Current Period Sales	(18,421)	(12,768)	(12,025)
Actual Charges Related to Prior Period Sales	(7,996)	(6,074)	(4,874)
Balance at End of Period	32,553	14,859	10,429
Reserve for Cash Discount
Supplemental Balance Sheet Information [Line Items]
Balance at Beginning of Period	688	388	372
Provision for Current Period Sales	7,402	6,435	4,549
Actual Charges Related to Current Period Sales	(6,722)	(5,747)	(4,191)
Actual Charges Related to Prior Period Sales	(537)	(388)	(342)
Balance at End of Period	831	688	388
Sales Return Reserve
Supplemental Balance Sheet Information [Line Items]
Balance at Beginning of Period		907
Provision for Current Period Sales	40		907
Provision/(Reversals) for Prior Period Sales		(907)
Balance at End of Period	40		907
Allowance for Doubtful Accounts
Supplemental Balance Sheet Information [Line Items]
Balance at Beginning of Period	490	529	348
Provision for Current Period Sales		410	138
Provision/(Reversals) for Prior Period Sales	(397)	(319)	43
Actual Charges Related to Prior Period Sales		(130)
Balance at End of Period	$ 93	$ 490	$ 529