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Components of Inventory (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Finished goods $ 139,556us-gaap_InventoryFinishedGoodsNetOfReserves $ 134,564us-gaap_InventoryFinishedGoodsNetOfReserves
Work in process 1,814us-gaap_InventoryWorkInProcessNetOfReserves 1,887us-gaap_InventoryWorkInProcessNetOfReserves
Raw materials 1,627us-gaap_InventoryRawMaterialsNetOfReserves 1,473us-gaap_InventoryRawMaterialsNetOfReserves
Total $ 142,997us-gaap_InventoryNet $ 137,924us-gaap_InventoryNet