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Inventories - Inventories, Net of Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 61,266us-gaap_InventoryRawMaterials $ 59,440us-gaap_InventoryRawMaterials
In-process and finished 117,580us-gaap_InventoryFinishedGoodsAndWorkInProcess 109,578us-gaap_InventoryFinishedGoodsAndWorkInProcess
Supplies 69,859us-gaap_OtherInventorySupplies 67,292us-gaap_OtherInventorySupplies
Total $ 248,705us-gaap_InventoryNet $ 236,310us-gaap_InventoryNet