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Long-Term Debt (Details) (Successor [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Debt Instrument [Line Items]      
Long-term debt $ 979,001us-gaap_LongTermDebt   971,116us-gaap_LongTermDebt
Net realized losses on extinguishment of debt $ (93)us-gaap_GainsLossesOnExtinguishmentOfDebt $ 0us-gaap_GainsLossesOnExtinguishmentOfDebt  
5.1% Surplus Notes, General Account, Due 2020 [Member] | Ambac Assurance Corporation [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ambc_A5.1SurplusNotesGeneralAccountDue2020Member
/ dei_LegalEntityAxis
= ambc_AmbacAssuranceCorporationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		   5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ambc_A5.1SurplusNotesGeneralAccountDue2020Member
/ dei_LegalEntityAxis
= ambc_AmbacAssuranceCorporationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Debt Instruments Maturity Year 2020   2020
5.1% Surplus Notes, Segregated Account, Due 2020 [Member] | Ambac Assurance Corporation [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ambc_A5.1SurplusNotesSegregatedAccountDue2020Member
/ dei_LegalEntityAxis
= ambc_AmbacAssuranceCorporationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		   5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ambc_A5.1SurplusNotesSegregatedAccountDue2020Member
/ dei_LegalEntityAxis
= ambc_AmbacAssuranceCorporationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Debt Instruments Maturity Year 2020   2020
5.1% Junior Surplus Notes, Segregated Account Due 2020 [Member] | Ambac Assurance Corporation [Member]
      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ambc_A5.1JuniorSurplusNotesSegregatedAccountDue2020Member
/ dei_LegalEntityAxis
= ambc_AmbacAssuranceCorporationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		   5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ambc_A5.1JuniorSurplusNotesSegregatedAccountDue2020Member
/ dei_LegalEntityAxis
= ambc_AmbacAssuranceCorporationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Debt Instruments Maturity Year 2020   2020