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Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Ambac Rating |  |
Notional outstanding | $ 5,207,364 | $ 11,281,777
Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 11,281,777
Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 5,207,364 |
Other Derivatives [Member] | Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 11,281,777
Other Derivatives [Member] | Predecessor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 678,483
Other Derivatives [Member] | Predecessor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 5,955,118
Other Derivatives [Member] | Predecessor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 3,684,193
Other Derivatives [Member] | Predecessor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 672,293
Other Derivatives [Member] | Predecessor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 291,690
Other Derivatives [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 5,207,364 |
Other Derivatives [Member] | Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 672,459 |
Other Derivatives [Member] | Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,495,605 |
Other Derivatives [Member] | Successor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,901,712 |
Other Derivatives [Member] | Successor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 856,041 |
Other Derivatives [Member] | Successor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 281,547 |
CLO [Member] | Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 6,155,767
CLO [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,609,378 |
CLO [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 6,155,767
CLO [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 166,200
CLO [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 4,676,362
CLO [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 1,313,205
CLO [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  |
CLO [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  |
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,609,378 |
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 193,286 |
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,289,541 |
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 126,551 |
Other [Member] | Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 5,126,010
Other [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 3,597,986 |
Other [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 5,126,010
Other [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 512,283
Other [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 1,278,756
Other [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 2,370,988
Other [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 672,293
Other [Member] | Other Derivatives [Member] | Predecessor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  | 291,690
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 3,597,986 |
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 479,173 |
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 206,064 |
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,775,161 |
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 856,041 |
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | $ 281,547 |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_NotionalAmountOfDerivativesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration