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Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Ambac Rating |  |
Notional outstanding | $ 1,313,797 | $ 1,529,759
Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,313,797 | 1,529,759
Other Derivatives [Member] | Successor [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 0
Other Derivatives [Member] | Successor [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 574,899 | 767,603
Other Derivatives [Member] | Successor [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 9,322 | 43,160
Other Derivatives [Member] | Successor [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 469,724 | 448,249
Other Derivatives [Member] | Successor [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 259,852 | 270,747
CLO [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 341,668 | 549,923
CLO [Member] | Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 341,668 | 549,923
CLO [Member] | Other Derivatives [Member] | Successor [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 0
CLO [Member] | Other Derivatives [Member] | Successor [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 341,668 | 549,923
CLO [Member] | Other Derivatives [Member] | Successor [Member] | A Rating [Member] [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 0
Other [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 972,129 | 979,836
Other [Member] | Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 972,129 | 979,836
Other [Member] | Other Derivatives [Member] | Successor [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 0
Other [Member] | Other Derivatives [Member] | Successor [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 233,231 | 217,680
Other [Member] | Other Derivatives [Member] | Successor [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 9,322 | 43,160
Other [Member] | Other Derivatives [Member] | Successor [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 469,724 | 448,249
Other [Member] | Other Derivatives [Member] | Successor [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | $ 259,852 | $ 270,747

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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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