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Obligations Under Investment Agreements Obligations Under Investment Agreements - Principal Due Under Investment Agreements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Investment [Line Items]  
Investment Agreement Expected Repayments of Principal $ 161,451ambc_InvestmentAgreementExpectedRepaymentsofPrincipal
2015 [Member]  
Investment [Line Items]  
Investment Agreement Expected Repayments of Principal 48,928ambc_InvestmentAgreementExpectedRepaymentsofPrincipal
/ ambc_OptionalDrawDateAxis
= ambc_A2015Member
2016 [Member]  
Investment [Line Items]  
Investment Agreement Expected Repayments of Principal 5,263ambc_InvestmentAgreementExpectedRepaymentsofPrincipal
/ ambc_OptionalDrawDateAxis
= ambc_A2016Member
2017 [Member]  
Investment [Line Items]  
Investment Agreement Expected Repayments of Principal 107,260ambc_InvestmentAgreementExpectedRepaymentsofPrincipal
/ ambc_OptionalDrawDateAxis
= ambc_A2017Member
2018 [Member]  
Investment [Line Items]  
Investment Agreement Expected Repayments of Principal 0ambc_InvestmentAgreementExpectedRepaymentsofPrincipal
/ ambc_OptionalDrawDateAxis
= ambc_A2018Member
2019 [Member]  
Investment [Line Items]  
Investment Agreement Expected Repayments of Principal 0ambc_InvestmentAgreementExpectedRepaymentsofPrincipal
/ ambc_OptionalDrawDateAxis
= ambc_A2019Member
All Later Years [Member]  
Investment [Line Items]  
Investment Agreement Expected Repayments of Principal $ 0ambc_InvestmentAgreementExpectedRepaymentsofPrincipal
/ ambc_OptionalDrawDateAxis
= ambc_AllLaterYearsMember