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Summary of Significant Accounting Policies (Details 3)
 12 Months Ended
Dec. 31, 2011
segment
Dec. 31, 2010
Dec. 31, 2009
Summary of Significant Accounting Policies      
Number of reportable segments 1    
Segment Information      
Sales (as a percent) 100.00% 100.00% 100.00%
Carbon steel
      
Segment Information      
Sales (as a percent) 53.00% 52.00% 56.00%
Aluminum
      
Segment Information      
Sales (as a percent) 15.00% 18.00% 18.00%
Stainless steel
      
Segment Information      
Sales (as a percent) 15.00% 16.00% 13.00%
Alloy steel
      
Segment Information      
Sales (as a percent) 10.00% 8.00% 7.00%
Toll processing
      
Segment Information      
Sales (as a percent) 2.00% 2.00% 2.00%
Other
      
Segment Information      
Sales (as a percent) 5.00% 4.00% 4.00%