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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Successor Ambac [Member]
Apr. 30, 2013
Successor Ambac [Member]
Jun. 30, 2013
Successor Ambac [Member]
Variable Interest Entities [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest Rate Swaps [Member]
Jun. 30, 2013
Successor Ambac [Member]
Interest Rate Swaps [Member]
Variable Interest Entities [Member]
Jun. 30, 2013
Successor Ambac [Member]
Futures contracts [Member]
Jun. 30, 2013
Successor Ambac [Member]
Credit Derivatives [Member]
Jun. 30, 2013
Successor Ambac [Member]
Other Contracts [Member]
Jun. 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 $ 147,559     $ 144,707   $ 2,852         $ 199,370   $ 198,117   $ 1,253      
Gross Amounts of Recognized Liabilities, Derivative Liabilities 508,171   1,989,783 275,712 1,897,311    232,267 192 92,472   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 56,381      56,381                  73,264    73,264               
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities 56,381      56,381                  73,264    73,264               
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets 91,178 121,643   88,326   2,852       121,643 126,106   124,853   1,253      
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities 451,790 621,645 1,989,783 219,331 1,897,311    232,267 192 92,472 621,645 531,315 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 1,673          1,673                           
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities 89,711      89,711                  180,113    180,113               
Net Amount, Derivative Assets 89,505     88,326   1,179         126,106   124,853   1,253      
Net Amount, Derivative Liabilities $ 362,079   $ 1,989,783 $ 129,620 $ 1,897,311    $ 232,267 $ 192 $ 92,472   $ 351,202 $ 2,221,781 $ 137,397 $ 2,131,315    $ 213,585 $ 220 $ 90,466