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Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2014 | Apr. 30, 2013 | Dec. 31, 2012
Successor [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | $ 802,462 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ (585,038)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Predecessor [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | (297,855)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (168,242)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Net Change in Fair Value of Credit Derivatives [Member] | Successor [Member] | Credit Derivatives [Member] | Financial Guarantee [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 192,869 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_FinancialGuaranteeMember / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_IncomeStatementLocationAxis = ambc_NetChangeInFairValueOfCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 23,906 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_FinancialGuaranteeMember / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_IncomeStatementLocationAxis = ambc_NetChangeInFairValueOfCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Net Change in Fair Value of Credit Derivatives [Member] | Predecessor [Member] | Credit Derivatives [Member] | Financial Guarantee [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | (60,384)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_FinancialGuaranteeMember / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_IncomeStatementLocationAxis = ambc_NetChangeInFairValueOfCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (9,219)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_FinancialGuaranteeMember / us-gaap_DerivativeInstrumentRiskAxis = ambc_CreditDerivativesMember / us-gaap_IncomeStatementLocationAxis = ambc_NetChangeInFairValueOfCreditDerivativesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Derivative Products [Member] | Successor [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 114,771 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (181,087)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Derivative Products [Member] | Successor [Member] | Interest Rate Swaps [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 104,114 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (173,595)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Derivative Products [Member] | Successor [Member] | Currency Swaps [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Derivative Products [Member] | Successor [Member] | Futures Contracts [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 10,925 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (7,472)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Derivative Products [Member] | Successor [Member] | Other Contracts [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (268)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = ambc_OtherContractsMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (20)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = ambc_OtherContractsMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Derivative Products [Member] | Predecessor [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | (33,735)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (125,004)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Derivative Products [Member] | Predecessor [Member] | Interest Rate Swaps [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | (30,622)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (111,396)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Derivative Products [Member] | Predecessor [Member] | Currency Swaps [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 807 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Derivative Products [Member] | Predecessor [Member] | Futures Contracts [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | (3,133)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (14,864)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_FutureMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Derivative Products [Member] | Predecessor [Member] | Other Contracts [Member] | Financial Services Derivatives Products [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | 20 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = ambc_OtherContractsMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 449 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = ambc_FinancialServicesDerivativesProductsMember / us-gaap_DerivativeInstrumentRiskAxis = ambc_OtherContractsMember / us-gaap_IncomeStatementLocationAxis = ambc_DerivativeProductsMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Other Income [Member] | Predecessor [Member] | Call Options on Long-Term Debt [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = ambc_CallOptionsonLongTermDebtMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 100,710 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = ambc_CallOptionsonLongTermDebtMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Income Loss On Variable Interest Entities [Member] | Successor [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 494,822 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | (427,857)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Income Loss On Variable Interest Entities [Member] | Successor [Member] | Interest Rate Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | 495,712 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | (452,434)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Income Loss On Variable Interest Entities [Member] | Successor [Member] | Currency Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total | (890)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 24,577 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Income Loss On Variable Interest Entities [Member] | Predecessor [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | (203,736)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | (134,729)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Income Loss On Variable Interest Entities [Member] | Predecessor [Member] | Interest Rate Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | (203,620)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | (107,341)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Income Loss On Variable Interest Entities [Member] | Predecessor [Member] | Currency Swaps [Member] | Variable Interest Entity [Member] |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |
Derivative instruments, gain (loss) recognized in income, net, Total |  |  | $ (116)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | $ (27,388)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = ambc_IncomeLossOnVariableInterestEntitiesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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