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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2010
Operating Loss Carryforwards [Line Items] |  |
Loss carry-forwards exceed |  | $ 3,400,000
Percentage of payment to IRS, Tier C | 12.50% |
Percentage of payment to IRS, Tier D | 17.50% |
Valuation allowance | 3,134,054 |
Expiration period | Expiring in 2029 and will fully expire in 2034 |
Operating tax carryforward expiration year start | 2029 |
Operating tax carryforward expiration year end | 2034 |
Net operating loss carryforwards exceeds |  | 3,400,000
Relinquishment of carry-forward of loss | 1,059,988 |
Net operating loss will be reduced for cancellation of indebtedness income and reduction of interest expense | 816,380 |
U. S. federal net operating tax [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating tax carryforward | 7,107,171 |
Ambac Assurance [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Potential payment to outstanding disputes | 100,000 |
Ambac [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Potential payment to outstanding disputes | $ 1,900 |

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- Definition Payment by subsidiary to the Internal Revenue Service associated with Net Operating Loss Usage Tier C under the Amended Tax Sharing Agreement. + References No definition available. + Details
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