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Inventories - Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw material $ 139,647us-gaap_InventoryRawMaterials $ 31,335us-gaap_InventoryRawMaterials
Work in process 476us-gaap_InventoryWorkInProcess 415us-gaap_InventoryWorkInProcess
Finished goods 259,872us-gaap_InventoryFinishedGoods 101,834us-gaap_InventoryFinishedGoods
Total inventories, gross 399,995us-gaap_InventoryGross 133,584us-gaap_InventoryGross
Inventory reserves (5,819)us-gaap_InventoryValuationReserves (12,561)us-gaap_InventoryValuationReserves
Total inventories, net $ 394,176us-gaap_InventoryNet $ 121,023us-gaap_InventoryNet