Inventory Valued at Lower of Cost (First-in, First-out) or Net Realizable Value, Net of Inventory Obsolescence Reserve (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Raw materials	$ 2,155	$ 5,204
Finished goods	65,311	70,231
Inventory, net	$ 67,466	$ 75,435