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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) (Successor [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2013
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Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | $ 163,683 ambc_FinancialAndDerivativeAssetsGrossRecognizedAmount | $ 134,587 ambc_FinancialAndDerivativeAssetsGrossRecognizedAmount |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 461,610 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount | 310,774 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 54,666 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement | 56,876 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 54,666 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement | 56,876 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 109,017 us-gaap_DerivativeAssets | 77,711 us-gaap_DerivativeAssets | 121,643 us-gaap_DerivativeAssets
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 406,944 us-gaap_DerivativeLiabilities | 253,898 us-gaap_DerivativeLiabilities | 621,645 us-gaap_DerivativeLiabilities
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets | 0 ambc_DerivativeAssetsGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset | 690 ambc_DerivativeAssetsGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 170,135 ambc_DerivativeLiabilitiesGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset | 42,555 ambc_DerivativeLiabilitiesGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset |
Net Amount, Derivative Assets | 109,017 ambc_DerivativeAssetsNetAmount | 77,021 ambc_DerivativeAssetsNetAmount |
Net Amount, Derivative Liabilities | 236,809 ambc_DerivativeLiabilitiesNetAmount | 211,343 ambc_DerivativeLiabilitiesNetAmount |
Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,200,163 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 1,772,306 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,200,163 us-gaap_DerivativeLiabilities / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 1,772,306 us-gaap_DerivativeLiabilities / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 0 ambc_DerivativeLiabilitiesGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 0 ambc_DerivativeLiabilitiesGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Net Amount, Derivative Liabilities | 2,200,163 ambc_DerivativeLiabilitiesNetAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 1,772,306 ambc_DerivativeLiabilitiesNetAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 161,640 ambc_FinancialAndDerivativeAssetsGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 132,250 ambc_FinancialAndDerivativeAssetsGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 385,346 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 216,287 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 54,666 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 56,876 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 54,666 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 56,876 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 106,974 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 75,374 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 330,680 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 159,411 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 169,573 ambc_DerivativeLiabilitiesGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 42,555 ambc_DerivativeLiabilitiesGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amount, Derivative Assets | 106,974 ambc_DerivativeAssetsNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 75,374 ambc_DerivativeAssetsNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amount, Derivative Liabilities | 161,107 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 116,856 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Interest Rate Swaps [Member] | Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,133,268 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 1,680,834 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,133,268 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 1,680,834 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Net Amount, Derivative Liabilities | 2,133,268 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 1,680,834 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Futures Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets |  | 2,337 ambc_FinancialAndDerivativeAssetsGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 562 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets |  | 2,337 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 562 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets |  | 690 ambc_DerivativeAssetsGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 562 ambc_DerivativeLiabilitiesGrossAmountOfCollateralCashAndSecuritiesPledgedNotOffset / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Net Amount, Derivative Assets |  | 1,647 ambc_DerivativeAssetsNetAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amount, Derivative Liabilities | 0 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_FuturesContractsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Credit Derivatives [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Assets, Derivative Assets | 2,043 ambc_FinancialAndDerivativeAssetsGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 75,502 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 94,322 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets / Liabilities | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_AmountOfGrossDerivativeAssetOrLiabilitiesAtFairValuePresentedAsOffsetUnderMasterNettingAgreement / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 2,043 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 75,502 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 94,322 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amount, Derivative Assets | 2,043 ambc_DerivativeAssetsNetAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Net Amount, Derivative Liabilities | 75,502 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 94,322 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Other Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 200 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 165 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 200 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 165 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net Amount, Derivative Liabilities | 200 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 165 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Currency Swaps [Member] | Variable Interest Entities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 66,895 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 91,472 ambc_FinancialAndDerivativeLiabilityGrossRecognizedAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 66,895 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | 91,472 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |
Net Amount, Derivative Liabilities | $ 66,895 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember | $ 91,472 ambc_DerivativeLiabilitiesNetAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = ambc_VariableInterestEntityMember |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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