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Inventories, net - Schedule of Inventories, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventories net    
Raw materials $ 6,340 $ 6,995
Billet 6,978 12,702
Wire rod 18,261 7,155
Work in process 6,824 6,771
Finished products 31,087 29,228
Supplies 28,227 25,716
Total $ 97,717 $ 88,567