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Inventories, Net - Schedule of Inventories, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Inventories net    
Raw materials $ 5,375 $ 6,995
Billet 7,180 12,702
Wire rod 19,577 10,142
Work in process 6,523 6,771
Finished product 30,912 26,241
Supplies 30,882 25,716
Total $ 100,449 $ 88,567