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Fresh Start Financial Statement Reporting - Schedule of Impact of Fresh Start Adjustments (Parenthetical) (Detail)
 1 Months Ended
Apr. 30, 2013
Fresh-Start Adjustment [Line Items]  
Coupon rate 5.01%ambc_FairValueInputsCouponRate
Loans (Non-VIE) [Member]  
Fresh-Start Adjustment [Line Items]  
Principal-weighted average life 6 years 9 months 22 days
Discount rate 9.71%us-gaap_FairValueInputsDiscountRate
/ invest_InvestmentAxis
= ambc_NonVariableInterestEntitiesLoansMember
VIE Loans and Long-Term Debt [Member]  
Fresh-Start Adjustment [Line Items]  
Discount rate 5.70%us-gaap_FairValueInputsDiscountRate
/ invest_InvestmentAxis
= ambc_VariableInterestEntityLoansAndLongTermDebtMember
Obligations Under Investment Agreements [Member]  
Fresh-Start Adjustment [Line Items]  
Discount rate 9.40%us-gaap_FairValueInputsDiscountRate
/ invest_InvestmentAxis
= ambc_InvestmentAgreementObligationsMember
Surplus Notes [Member]  
Fresh-Start Adjustment [Line Items]  
Discount rate 10.60%us-gaap_FairValueInputsDiscountRate
/ invest_InvestmentAxis
= ambc_SurplusNotesMember
Junior Surplus Notes [Member]  
Fresh-Start Adjustment [Line Items]  
Discount rate 16.60%us-gaap_FairValueInputsDiscountRate
/ invest_InvestmentAxis
= ambc_JuniorSurplusNotesMember