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Schedule of Inventory (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 22,488us-gaap_InventoryRawMaterialsNetOfReserves $ 15,309us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 114,393us-gaap_InventoryWorkInProcessNetOfReserves 88,417us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 62,571us-gaap_InventoryFinishedGoodsNetOfReserves 58,879us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventory $ 199,452us-gaap_InventoryNet $ 162,605us-gaap_InventoryNet