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Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Ambac Rating |  |
Notional outstanding | $ 1,958,926 | $ 2,776,103
Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,958,926 | 2,776,103
Other Derivatives [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,958,926 | 2,776,103
Other Derivatives [Member] | Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 24,034
Other Derivatives [Member] | Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 877,933 | 1,412,096
Other Derivatives [Member] | Successor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 43,160 | 235,917
Other Derivatives [Member] | Successor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 761,700 | 826,175
Other Derivatives [Member] | Successor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 276,133 | 277,881
CLO [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 669,251 | 1,337,737
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 669,251 | 1,337,737
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 0
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 669,251 | 1,209,071
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] | A Rating [Member] [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 128,666
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  |
CLO [Member] | Other Derivatives [Member] | Successor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding |  |
Other [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,289,675 | 1,438,366
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,289,675 | 1,438,366
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 24,034
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 208,682 | 203,025
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 43,160 | 107,251
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 761,700 | 826,175
Other [Member] | Other Derivatives [Member] | Successor Ambac [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | $ 276,133 | $ 277,881

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- 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
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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