Federal Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended	9 Months Ended	3 Months Ended	12 Months Ended
Dec. 31, 2012	Dec. 31, 2012 Successor [Member]	Mar. 19, 2012 Predecessor [Member]	Dec. 31, 2011 Predecessor [Member]	Dec. 31, 2010 Predecessor [Member]
Income Taxes And Tax Related [Line Items]
Income tax at the federal statutory rate of 35%	35.00%	(35.00%)	(35.00%)	(35.00%)	(35.00%)
Tax benefit recovered from parent in bankruptcy					$ (610)
Fresh start accounting adjustments				(3)	(7)
Worthless stock deduction		(23,718)
Cancelation of debt		2,401			439
Reduction in NOL due to 382 Limitation		4,518
Change in valuation allowance		$ 16,834	$ 35	$ 38	$ 42
Effective Rate					(171.00%)

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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