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Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Ambac Rating |  |
Notional outstanding | $ 1,529,759 invest_DerivativeNotionalAmount | $ 2,776,103 invest_DerivativeNotionalAmount
Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,529,759 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 2,776,103 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 1,529,759 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 2,776,103 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other Derivatives [Member] | Successor [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 24,034 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other Derivatives [Member] | Successor [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 767,603 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,412,096 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other Derivatives [Member] | Successor [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 43,160 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_RatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 235,917 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_RatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other Derivatives [Member] | Successor [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 448,249 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_BbbRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 826,175 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_BbbRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other Derivatives [Member] | Successor [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 270,747 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_BelowInvestmentGradeRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 277,881 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_BelowInvestmentGradeRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
CLO [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 549,923 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember | 1,337,737 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
CLO [Member] | Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 549,923 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember | 1,337,737 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
CLO [Member] | Other Derivatives [Member] | Successor [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember | 0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
CLO [Member] | Other Derivatives [Member] | Successor [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 549,923 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember | 1,209,071 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
CLO [Member] | Other Derivatives [Member] | Successor [Member] | A Rating [Member] [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_ARatingMemberMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember | 128,666 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_ARatingMemberMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_CollateralizedLoanObligationsMember
Other [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 979,836 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember | 1,438,366 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember
Other [Member] | Other Derivatives [Member] | Successor [Member] |  |
Ambac Rating |  |
Notional outstanding | 979,836 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember | 1,438,366 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember
Other [Member] | Other Derivatives [Member] | Successor [Member] | AAA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember | 24,034 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember
Other [Member] | Other Derivatives [Member] | Successor [Member] | AA Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 217,680 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember | 203,025 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_AaRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember
Other [Member] | Other Derivatives [Member] | Successor [Member] | A Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 43,160 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_RatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember | 107,251 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_RatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember
Other [Member] | Other Derivatives [Member] | Successor [Member] | BBB Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | 448,249 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_BbbRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember | 826,175 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_BbbRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember
Other [Member] | Other Derivatives [Member] | Successor [Member] | Below Investment Grade Rating [Member] |  |
Ambac Rating |  |
Notional outstanding | $ 270,747 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_BelowInvestmentGradeRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember | $ 277,881 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_OtherCreditDerivativesMember / invest_CreditRatingSourceAxis = ambc_BelowInvestmentGradeRatingMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_UnderlyingAssetClassAxis = us-gaap_UnderlyingOtherMember

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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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