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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Successor Ambac [Member]
Apr. 30, 2013
Successor Ambac [Member]
Sep. 30, 2013
Successor Ambac [Member]
Variable Interest Entities [Member]
Sep. 30, 2013
Successor Ambac [Member]
Interest Rate Swaps [Member]
Sep. 30, 2013
Successor Ambac [Member]
Interest Rate Swaps [Member]
Variable Interest Entities [Member]
Sep. 30, 2013
Successor Ambac [Member]
Futures Contracts [Member]
Sep. 30, 2013
Successor Ambac [Member]
Credit Derivatives [Member]
Sep. 30, 2013
Successor Ambac [Member]
Other Contracts [Member]
Sep. 30, 2013
Successor Ambac [Member]
Currency Swaps [Member]
Variable Interest Entities [Member]
Apr. 30, 2013
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Variable Interest Entities [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Interest Rate Swaps [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Interest Rate Swaps [Member]
Variable Interest Entities [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Futures Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Credit Derivatives [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Other Contracts [Member]
Dec. 31, 2012
Predecessor Ambac [Member]
Currency Swaps [Member]
Variable Interest Entities [Member]
Derivatives, Fair Value [Line Items]                                    
Gross Amounts of Recognized Assets, Derivative Assets $ 141,139     $ 141,139              $ 199,370   $ 198,117   $ 1,253      
Gross Amounts of Recognized Liabilities, Derivative Liabilities 458,559   2,047,204 253,728 1,960,732 2,023 202,653 155 86,472   604,579 2,221,781 390,774 2,131,315    213,585 220 90,466
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities 58,177      58,177                  73,264    73,264               
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities 58,177      58,177                  73,264    73,264               
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 82,962 121,643   82,962            121,643 126,106   124,853   1,253      
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 400,382 621,645 2,047,204 195,551 1,960,732 2,023 202,653 155 86,472 621,645 531,315 2,221,781 317,510 2,131,315    213,585 220 90,466
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets                                          
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities 71,536      69,513    2,023            180,113    180,113               
Net Amount, Derivative Assets 82,962     82,962              126,106   124,853   1,253      
Net Amount, Derivative Liabilities $ 328,846   $ 2,047,204 $ 126,038 $ 1,960,732    $ 202,653 $ 155 $ 86,472   $ 351,202 $ 2,221,781 $ 137,397 $ 2,131,315    $ 213,585 $ 220 $ 90,466