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Inventories - Inventories, Net of Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 59,410 $ 59,440
In-process and finished 118,620 109,578
Supplies 70,025 67,292
Total $ 248,055 $ 236,310