Inventory Valued at Lower of Cost (First-in, First-out) or Market, Net of Inventory Obsolescence Reserve (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Inventory [Line Items]
Raw materials	$ 4,344	$ 3,717
Finished goods	70,720	56,827
Inventory, net	$ 75,064	$ 60,544	[1]

[1] Derived from audited financial statements