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Inventory Valued at Lower of Cost (First-in, First-out) or Market, Net of Inventory Obsolescence Reserve (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
Raw materials $ 5,204 $ 3,717
Finished goods 70,231 56,827
Inventory, net $ 75,435 $ 60,544