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Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory [Line Items]    
Finished products $ 142,853us-gaap_InventoryFinishedGoodsNetOfReserves $ 126,872us-gaap_InventoryFinishedGoodsNetOfReserves
Raw materials 22,778us-gaap_InventoryRawMaterialsNetOfReserves 12,958us-gaap_InventoryRawMaterialsNetOfReserves
Total Inventories $ 165,631us-gaap_InventoryNet $ 139,830us-gaap_InventoryNet