Revenue Recognition and Accounts Receivable - Schedule of Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue Recognition And Accounts Receivable [Abstract]
Product sales									$ 355,652	$ 341,084	$ 351,525
Marketing service fees									54,136	55,405	50,752
Net sales	$ 108,537	$ 98,497	$ 104,075	$ 98,679	$ 104,622	$ 101,151	$ 100,954	$ 89,762	$ 409,788	$ 396,489	$ 402,277