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Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail) (Successor [Member]) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Corporate Obligations [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Coupon rate | 0.345%ambc_FairValueInputsCouponRate / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Fair Value Inputs Maturity | 19 years 1 month 21 days |
Yield | 4.93%ambc_FairValueInputsYield / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Variable Interest Entity, Primary Beneficiary [Member] | United States Transactions [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Coupon rate | 5.88%ambc_FairValueInputsCouponRate / us-gaap_FairValueByAssetClassAxis = ambc_UnitedStatesTransactionsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 5.88%ambc_FairValueInputsCouponRate / us-gaap_FairValueByAssetClassAxis = ambc_UnitedStatesTransactionsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Fair Value Inputs Maturity | 15 years 8 months 20 days | 15 years 10 months 4 days
Yield | 7.50%ambc_FairValueInputsYield / us-gaap_FairValueByAssetClassAxis = ambc_UnitedStatesTransactionsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 7.37%ambc_FairValueInputsYield / us-gaap_FairValueByAssetClassAxis = ambc_UnitedStatesTransactionsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Variable Interest Entity, Primary Beneficiary [Member] | European Transactions [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Coupon rate | 0.57%ambc_FairValueInputsCouponRate / us-gaap_FairValueByAssetClassAxis = ambc_EuropeanTransactionsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 0.30%ambc_FairValueInputsCouponRate / us-gaap_FairValueByAssetClassAxis = ambc_EuropeanTransactionsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Fair Value Inputs Maturity | 17 years 11 months | 21 years 2 months 30 days
Yield | 7.30%ambc_FairValueInputsYield / us-gaap_FairValueByAssetClassAxis = ambc_EuropeanTransactionsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 9.52%ambc_FairValueInputsYield / us-gaap_FairValueByAssetClassAxis = ambc_EuropeanTransactionsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember

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- Definition Fair value inputs coupon rate. + References No definition available. + Details
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- Definition Fair value inputs maturity. + References No definition available. + Details
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- Definition Fair value inputs yield. + References No definition available. + Details
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- Details
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