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Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Finished products $ 142,269us-gaap_InventoryFinishedGoodsNetOfReserves $ 142,853us-gaap_InventoryFinishedGoodsNetOfReserves
Raw materials 24,712us-gaap_InventoryRawMaterialsNetOfReserves 22,778us-gaap_InventoryRawMaterialsNetOfReserves
Total Inventories $ 166,981us-gaap_InventoryNet $ 165,631us-gaap_InventoryNet