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Derivative Instruments - Summary of Notional Amounts of AFS's Trading Derivative Products (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative products, Notional Amount | $ 1,529,759 invest_DerivativeNotionalAmount | $ 2,776,103 invest_DerivativeNotionalAmount
Successor [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative products, Notional Amount | 1,529,759 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 2,776,103 invest_DerivativeNotionalAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
AFS [Member] | Successor [Member] | Interest Rate Swaps [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative products, Notional Amount | 782,904 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 697,837 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
AFS [Member] | Successor [Member] | Interest Rate Swaps-Pay-Fixed/Receive-Variable [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative products, Notional Amount | 1,479,650 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_InterestRateSwapOneMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,540,976 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_InterestRateSwapOneMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
AFS [Member] | Successor [Member] | Interest Rate Swaps-Basis Swaps [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative products, Notional Amount | 55,800 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_BasisSwapMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 146,705 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_BasisSwapMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
AFS [Member] | Successor [Member] | Futures Contracts [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative products, Notional Amount | 80,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 100,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
AFS [Member] | Successor [Member] | Other Contracts [Member] |  |
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items] |  |
Derivative products, Notional Amount | $ 75,650 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_OtherContractsMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 75,650 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_OtherContractsMember / dei_LegalEntityAxis = ambc_AfsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

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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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