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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
Sep. 30, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials $ 1,074 $ 1,040
Finished goods 80,330 77,787
Inventory, net $ 81,404 $ 78,827 [1]
[1] Derived from audited financial statements