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Financial Guarantee Insurance - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Summary of Ceded Par and Net Unsecured Reinsurance Recoverable [Line Items] |
Percentage ceded Par | 100.00%ambc_PercentageOfCededFinancialGuaranteePrincipalOutstanding
Net unsecured reinsurance recoverable | $ 41,941 ambc_UnsecuredReinsuranceRecoverables
Assured Guaranty Re Ltd [Member] | Negative [Member] | Moody's, Baa1 Rating [Member] |
Summary of Ceded Par and Net Unsecured Reinsurance Recoverable [Line Items] |
Percentage ceded Par | 89.40%ambc_PercentageOfCededFinancialGuaranteePrincipalOutstanding / us-gaap_CededCreditRiskAxis = ambc_AssuredGuarantyReLtdMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa1RatingMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ambc_NegativeMember
Net unsecured reinsurance recoverable | 37,553 ambc_UnsecuredReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = ambc_AssuredGuarantyReLtdMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa1RatingMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ambc_NegativeMember
Sompo Japan Nipponkoa Holdings, Inc [Member] | Stable [Member] | Moody's, A1 Rating [Member] |
Summary of Ceded Par and Net Unsecured Reinsurance Recoverable [Line Items] |
Percentage ceded Par | 6.10%ambc_PercentageOfCededFinancialGuaranteePrincipalOutstanding / us-gaap_CededCreditRiskAxis = ambc_SompoJapanInsuranceIncMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA1RatingMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ambc_StableMember
Net unsecured reinsurance recoverable | 0 ambc_UnsecuredReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = ambc_SompoJapanInsuranceIncMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA1RatingMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ambc_StableMember
Assured Guaranty Corporation [Member] | Negative [Member] | Moody's, A3 Rating [Member] |
Summary of Ceded Par and Net Unsecured Reinsurance Recoverable [Line Items] |
Percentage ceded Par | 4.50%ambc_PercentageOfCededFinancialGuaranteePrincipalOutstanding / us-gaap_CededCreditRiskAxis = ambc_AssuredGuarantyCorpMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA3RatingMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ambc_NegativeMember
Net unsecured reinsurance recoverable | $ 4,388 ambc_UnsecuredReinsuranceRecoverables / us-gaap_CededCreditRiskAxis = ambc_AssuredGuarantyCorpMember / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysA3RatingMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = ambc_NegativeMember

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- Definition Percentage of the cedant's total ceded financial guarantee principal outstanding. + References No definition available. + Details
Name: | ambc_PercentageOfCededFinancialGuaranteePrincipalOutstanding
Namespace Prefix: | ambc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ambc_SummaryOfCededParAndNetUnsecuredReinsuranceRecoverableLineItems
Namespace Prefix: | ambc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents reinsurance recoverables on paid and unpaid losses and deferred ceded premiums, net of ceded premiums payables due to reinsurers, letters of credit, and collateral posted for the benefit of the cedant. + References No definition available. + Details
Name: | ambc_UnsecuredReinsuranceRecoverables
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_CededCreditRiskAxis=ambc_AssuredGuarantyCorpMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CededCreditRiskAxis=ambc_AssuredGuarantyReLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CededCreditRiskAxis=ambc_SompoJapanInsuranceIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |