Schedule II - Valuation and Qualifying Accounts (Detail) - Valuation and Qualifying Accounts (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Dec. 31, 2010		Dec. 31, 2012		Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Beginning Balance	$ 34	[1]	$ 80	[1],[2]
Additions					80	[1],[2]
Deductions	(34)	[1]	(80)	[1],[2]
Ending Balance					80	[1],[2]
Valuation Allowance of Deferred Tax Assets [Member]
Beginning Balance	81,218		69,508		70,449
Deductions	(10,769)		(32,335)		(941)
Ending Balance	70,449		37,173		69,508
Sales Reserves [Member]
Beginning Balance	668	[1]
Additions	270	[1]
Deductions	(938)	[1]
Allowances [Member]
Beginning Balance	941	[1]
Additions	703	[1]
Deductions	$ (1,644)	[1]

[1] Amounts are included in "Accounts receivable" in the Consolidated Balance Sheets. All other schedules are omitted because they are not applicable or the amounts are immaterial or the required information is presented in the Consolidated Financial Statements and Notes thereto.

[2] Amount relates to accounts receivables from our Steel Energy segment.