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Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Ambac Rating |  |
Notional outstanding | $ 933,064 | $ 970,883
Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 933,064 | 970,883
Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 933,064 | 970,883
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 | 486,337 | 536,712
Other Derivatives [Member] | Successor [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 9,322
Other Derivatives [Member] | Successor [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 374,591 | 356,323
Other Derivatives [Member] | Successor [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 72,136 | 68,526
CLO [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 284,411 | 295,254
CLO [Member] | Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 284,411 | 295,254
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 | 284,411 | 295,254
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 | 648,653 | 675,629
Other [Member] | Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 648,653 | 675,629
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 | 201,926 | 241,458
Other [Member] | Other Derivatives [Member] | Successor [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 | 9,322
Other [Member] | Other Derivatives [Member] | Successor [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 374,591 | 356,323
Other [Member] | Other Derivatives [Member] | Successor [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | $ 72,136 | $ 68,526

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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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