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Inventories - Inventories, Net of Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 62,307 $ 59,440
In-process and finished 117,653 109,578
Supplies 67,809 67,292
Total $ 247,769 $ 236,310