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Inventories, Net - Schedule of Inventories, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventories net    
Raw materials $ 6,102 $ 5,375
Billet 7,553 7,180
Wire rod 21,902 19,577
Work in process 6,163 6,523
Finished products 29,361 30,912
Supplies 30,746 30,882
Total $ 101,827 $ 100,449