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Federal Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 19, 2012 | Nov. 23, 2010
Income Tax [Line Items] |  |  |  |  |
Net (loss) income | $ (15,800,000) |  |  |  |
Federal income tax expense (benefit) | 0 | 0 | 33,401,000 |  |
Income tax rate | 35.00% |  |  |  |
Income tax paid | 0 | 0 | 0 |  |
Accrued interest |  |  |  |  | 13,000,000
Current tax benefit |  |  | 13,000,000 |  |
Valuation allowance equal to net deferred federal income tax asset | 100.00% | 100.00% |  |  |
Abandoned stock |  |  |  | 8,370,000,000 |
Change in equity ownership |  |  |  | 50.00% |
Available and utilizable NOL | 5,970,000,000 |  |  |  |
NOLs expiration date | 2029 |  |  |  |
Reserve for uncertain federal income tax position | 0 |  |  |  |
Income tax interest income, expense or penalties | $ 0 | $ 0 | $ 0 |  |

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