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Schedule IV - Reinsurance (Details) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2013 Rate | Dec. 31, 2014 Rate | Apr. 30, 2013 Rate | Dec. 31, 2012 Rate
Successor [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Direct Premiums Written | $ (80,309)us-gaap_DirectPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ (288,310)us-gaap_DirectPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Ceded Premiums Written | (7,810)us-gaap_CededPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (6,842)us-gaap_CededPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Assumed Premiums Written | 0 us-gaap_AssumedPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_AssumedPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Premiums Written, Net | (72,499)us-gaap_PremiumsWrittenNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (281,468)us-gaap_PremiumsWrittenNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Percentage of Amount Assumed to Net | 0.00%ambc_Ambc_PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0.00%ambc_Ambc_PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Predecessor [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Direct Premiums Written |  |  | (14,125)us-gaap_DirectPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (277,508)us-gaap_DirectPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ceded Premiums Written |  |  | (1,098)us-gaap_CededPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (23,371)us-gaap_CededPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Assumed Premiums Written |  |  | 0 us-gaap_AssumedPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_AssumedPremiumsWritten / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Premiums Written, Net |  |  | $ (13,027)us-gaap_PremiumsWrittenNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ (254,137)us-gaap_PremiumsWrittenNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Percentage of Amount Assumed to Net |  |  | 0.00%ambc_Ambc_PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0.00%ambc_Ambc_PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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