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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, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials $ 3,265 $ 5,204
Finished goods 55,167 70,231
Inventory, net $ 58,432 $ 75,435