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Joint Ventures and Noncontrolling Interests (Details) | 12 Months Ended |  |  |
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Dec. 31, 2011 jointventure | Dec. 31, 2011 Acero Prime S. de R.L. de C.V. | Dec. 31, 2011 Oregon Feralloy Partners LLC | Dec. 31, 2011 Indiana Pickling & Processing Company | Dec. 31, 2011 Feralloy Processing Company | Dec. 31, 2011 Valex Corp. | Dec. 31, 2011 Valex Corp. People's Republic of China | Dec. 31, 2011 Valex Corp. South Korea | Dec. 31, 2011 FP Structural Solutions | Jun. 30, 2011 FP Structural Solutions | Dec. 31, 2011 Minimum | Dec. 31, 2011 Maximum
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  | 40.00% | 40.00% |  |  |  |  |  |  |  | 20.00% | 50.00%
Number of joint ventures in which the entity has a noncontrolling interest | 2 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investments other than equity method investment |  |  |  | 56.00% | 51.00% | 97.00% |  |  | 70.00% | 70.00% |  |
Ownership percentage in investments other than equity method investment |  |  |  |  |  |  | 93.00% | 92.00% |  |  |  |
Percentage of ownership for consolidation of financial statements |  |  |  |  |  |  |  |  |  |  | 50.00% |

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