Goodwill and Other Intangible Assets - Intangible Assets, net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 47,435	$ 47,435
Finite-Lived Intangible Assets, Accumulated Amortization	(14,164)	(7,548)
Intangible Assets, Net (Excluding Goodwill)	33,271	39,887
Steel Energy [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	47,200	47,200
Finite-Lived Intangible Assets, Accumulated Amortization	(14,062)	(7,481)
Intangible Assets, Net (Excluding Goodwill)	33,138	39,719
Customer Relationships [Member] | Steel Sports [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	235	235
Finite-Lived Intangible Assets, Accumulated Amortization	(102)	(67)
Intangible Assets, Net (Excluding Goodwill)	133	168
Customer Relationships [Member] | Steel Energy [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	43,100	43,100
Finite-Lived Intangible Assets, Accumulated Amortization	(11,986)	(6,356)
Intangible Assets, Net (Excluding Goodwill)	31,114	36,744
Trade Names [Member] | Steel Energy [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	4,100	4,100
Finite-Lived Intangible Assets, Accumulated Amortization	(2,076)	(1,125)
Intangible Assets, Net (Excluding Goodwill)	$ 2,024	$ 2,975