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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2011 | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2014 | Apr. 30, 2013 | Dec. 31, 2010
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued |  | $ 0 | $ 0 | $ 0 | $ 0 |
Income Tax Examination, Penalties and Interest Accrued | $ 3,650,000 |  |  |  |  |
NOL allocated amount |  | 4,298,770 |  |  |  |
Net Operating Loss Carry Forwards Reduced For Cancellation Of Indebtedness Income And Interest Expense |  |  | $ 816,380 |  |  |
Percentage Of Notional Federal Tax Liability | 25.00% |  |  |  |  |
AFG [Member] |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
NOL allocated amount |  | 1,382,109 |  |  |  |
Ambac [Member] |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Bankruptcy Claims, Amount Paid to Settle Claims |  |  |  |  | 1,900 |
Amount Of Loss Carry Forward Relinquish By Which Loss Carry Forward Exceed |  |  |  |  |  | $ 3,400,000
Amount Of Loss Carryforward Relinquishment |  |  |  |  |  | $ 1,059,988
Segregated Account [Member] |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Bankruptcy Claims, Amount Paid to Settle Claims |  |  |  |  | $ 100,000 |
U. S. Federal Net Operating Tax [Member] |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
NOL allocated amount |  | 4,154,786 |  |  |  |
United States [Member] |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
NOL allocated amount |  | 129,048 |  |  |  |
United Kingdom [Member] |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
NOL allocated amount |  | $ 14,936 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2029 |  |  |  |
Maximum [Member] |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2034 |  |  |  |

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