Description of the Business and Significant Accounting Policies (Details 2) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Goodwill
Goodwill	$ 728,751,000	$ 731,996,000
Omni Source [Member]
Goodwill
Goodwill	555,002,000	558,247,000
Goodwill decrease due to tax benefit related to the amortization of the component	3,200,000
Techs [Member]
Goodwill
Goodwill	142,783,000	142,783,000
Roanoke Bar Division [Member]
Goodwill
Goodwill	29,041,000	29,041,000
New Millennium Building Systems [Member]
Goodwill
Goodwill	$ 1,925,000	$ 1,925,000