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Inventories - Inventories, Net of Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 59,440 $ 61,084
In-process and finished 109,578 102,331
Supplies 67,292 58,951
Total $ 236,310 $ 222,366