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Joint Ventures and Noncontrolling Interests (Details) - item
12 Months Ended
Dec. 31, 2018
Oct. 23, 2018
Joint Ventures and Noncontrolling Interests    
Number of joint ventures in which the entity has a noncontrolling interest 2  
Eagle Steel Products, Inc.    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in equity method investment 45.00%  
Oregon Feralloy Partners LLC    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in equity method investment 40.00%  
Acero Prime S. de R.L. de C.V.    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in consolidated investments other than equity method investment 100.00% 60.00%
Feralloy Processing Company    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in consolidated investments other than equity method investment 51.00%  
Indiana Pickling & Processing Company    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in consolidated investments other than equity method investment 56.00%  
Valex Corp. | South Korea    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in consolidated investments other than equity method investment 95.00%  
Minimum    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in equity method investment 20.00%  
Percentage of ownership for consolidation of financial statements 50.00%  
Maximum    
Joint Ventures and Noncontrolling Interests    
Ownership percentage in equity method investment 50.00%