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Consolidated Statements of Total Comprehensive Income (Successor [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Successor [Member]
   
Revenues:    
Net premiums earned $ 65,718us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ 82,547us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net investment income:    
Securities available-for-sale and short-term 63,332us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
68,807us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Other investments 9,651ambc_OtherInvestmentIncome
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,994ambc_OtherInvestmentIncome
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Total net investment income 72,983us-gaap_NetInvestmentIncome
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
70,801us-gaap_NetInvestmentIncome
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Other-than-temporary impairment losses:    
Total other-than-temporary impairment losses (10,361)ambc_OtherThanTemporaryImpairmentLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(10,392)ambc_OtherThanTemporaryImpairmentLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Portion of other-than-temporary impairment recognized in other comprehensive income 7,242us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net other-than-temporary impairments (3,119)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(10,392)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net realized investment gains 54,101ambc_NetRealizedInvestmentGainsLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
16,289ambc_NetRealizedInvestmentGainsLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Change in fair value of credit derivatives:    
Realized gains and other settlements 419ambc_RealizedGainsLossesAndOtherSettlements
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
775ambc_RealizedGainsLossesAndOtherSettlements
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Unrealized gains (losses) (2,918)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
6,607us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net change in fair value of credit derivatives (2,499)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
7,382us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Derivative products (37,774)us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(53,841)us-gaap_GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net realized losses on extinguishment of debt (93)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Other income (expense) (788)us-gaap_OtherIncome
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,894us-gaap_OtherIncome
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Income (loss) on variable interest entities 6,962us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOperatingIncomeOrLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(5,542)us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOperatingIncomeOrLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Total revenues 155,491us-gaap_Revenues
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
109,138us-gaap_Revenues
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Expenses:    
Losses and loss (benefit) (150,952)us-gaap_IncurredClaimsFinancialGuaranteeInsuranceContracts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(140,011)us-gaap_IncurredClaimsFinancialGuaranteeInsuranceContracts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Insurance intangible amortization 37,432us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
31,714us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Underwriting and operating expenses 24,523us-gaap_OtherUnderwritingExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
25,786us-gaap_OtherUnderwritingExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Interest expense 27,908us-gaap_InterestExpenseDebt
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= us-gaap_SuccessorMember
32,328us-gaap_InterestExpenseDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Total expenses (benefit) (61,089)us-gaap_BenefitsLossesAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(50,183)us-gaap_BenefitsLossesAndExpenses
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Pre-tax income before reorganization items 216,580ambc_IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
159,321ambc_IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Reorganization items 0us-gaap_ReorganizationItems
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23us-gaap_ReorganizationItems
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= us-gaap_SuccessorMember
Pre-tax income 216,580us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
159,298us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Provision for income taxes 1,709us-gaap_IncomeTaxExpenseBenefit
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= us-gaap_SuccessorMember
3,249us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net income (loss) 214,871us-gaap_ProfitLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
156,049us-gaap_ProfitLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Less: net (gain) loss attributable to noncontrolling interest 160us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
107us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net income attributable to common shareholders 214,711us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
155,942us-gaap_NetIncomeLoss
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= us-gaap_SuccessorMember
Other comprehensive income (loss), after tax:    
Net income (loss) 214,871us-gaap_ProfitLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
156,049us-gaap_ProfitLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Unrealized gains (losses) on securities, net of deferred income taxes of $0 (17,448)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
88,722us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 (33,805)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
4,284us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Changes to postretirement benefit, net of tax of $0 (27)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(204)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Total other comprehensive income (loss), net of tax (51,280)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
92,802us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Total comprehensive income 163,591us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
248,851us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Less: comprehensive (loss) gain attributable to the noncontrolling interest:    
Net (gain) loss 160us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
107us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Currency translation adjustments (326)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
46us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest
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= us-gaap_SuccessorMember
Total comprehensive income attributable to Ambac Financial Group, Inc. $ 163,757us-gaap_ComprehensiveIncomeNetOfTax
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$ 248,698us-gaap_ComprehensiveIncomeNetOfTax
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Net income per share attributable to Ambac Financial Group, Inc. common shareholders: $ 4.75us-gaap_EarningsPerShareBasic
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$ 3.46us-gaap_EarningsPerShareBasic
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Basic $ 4.57us-gaap_EarningsPerShareDiluted
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$ 3.31us-gaap_EarningsPerShareDiluted
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= us-gaap_SuccessorMember