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Financial Guarantee Insurance Contracts - Summarized Future Gross Undiscounted Premiums Expected to be Collected, and Future Expected Premiums Earned, Net of Reinsurance (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Insurance [Abstract]  
Future premiums expected to be collected, June 30. 2015 $ 22,082us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringSecondQuarterFollowingTheBalanceSheetDate
Future premiums expected to be collected, September 30, 2015 22,103us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringThirdQuarterFollowingBalanceSheetDate
Future premiums expected to be collected, December 31, 2015 21,686us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringFourthQuarterFollowingBalanceSheetDate
Future premiums expected to be collected, December 31, 2016 83,054us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2017 76,968us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2018 72,261us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2019 68,564us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2024 304,049us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanFiveAndWithin10YearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2029 254,696us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan10AndWithin15YearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2034 179,393us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan15AndWithin20YearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2039 65,595us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan20AndWithin25YearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2044 25,189us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan25AndWithin30YearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2049 9,831us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan30AndWithin35YearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2054 1,244us-gaap_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan35AndWithin40YearsFromBalanceSheetDate
Future premiums expected to be collected, December 31, 2059 5ambc_FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanFortyAndWithinFortyFiveYearsFromBalanceSheetDate
Future premiums expected to be collected, Total 1,206,720us-gaap_FinancialGuaranteeInsuranceContractsPremiumReceivablePremiumExpectedToBeCollected
Future expected premiums to be earned, net of reinsurance, June 30, 2015 38,127us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSecondQuarterFollowingBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, September 30, 2015 35,798us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringThirdQuarterFollowingBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2015 33,635us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFourthQuarterFollowingBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2016 123,206us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2017 110,175us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2018 101,113us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2019 94,047us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2024 385,547us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFiveAndWithin10YearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2029 272,177us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan10AndWithin15YearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2034 169,638us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan15AndWithin20YearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2039 67,126us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan20AndWithin25YearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2044 23,328us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan25AndWithin30YearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2049 9,824us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan30AndWithin35YearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2054 2,183us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan35AndWithin40YearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, December 31, 2059 3ambc_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFortyAndWithinFortyFiveYearsFromBalanceSheetDate
Future expected premiums to be earned, net of reinsurance, Total $ 1,465,927us-gaap_FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized