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Inventories - Schedule of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 17,418 $ 17,411
Work-in-process 25,398 29,322
Finished goods 9,224 5,894
Supplies 11,155 11,502
Inventories $ 63,195 $ 64,129