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Consolidated Statements of Cash Flows (Successor [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Successor [Member]
   
Cash flows from operating activities:    
Net income attributable to common shareholders $ 214,711us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ 155,942us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net (loss) gain (160)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(107)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ 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
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 791us-gaap_DepreciationAmortizationAndAccretionNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
748us-gaap_DepreciationAmortizationAndAccretionNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Amortization of bond premium and discount (31,477)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(27,940)us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Reorganization items 0us-gaap_ReorganizationItems
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
23us-gaap_ReorganizationItems
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Share-based compensation 393us-gaap_ShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1,537us-gaap_ShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Deferred income taxes (174)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
3us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Current income taxes (3,368)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
3,023us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Unearned premiums, net (84,582)us-gaap_IncreaseDecreaseInUnearnedPremiums
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(84,667)us-gaap_IncreaseDecreaseInUnearnedPremiums
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Losses and loss expenses, net (197,332)us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(146,494)us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Ceded premiums payable (1,168)us-gaap_IncreaseDecreaseInReinsurancePayables
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(1,070)us-gaap_IncreaseDecreaseInReinsurancePayables
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Investment income due and accrued 21us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
3,022us-gaap_IncreaseDecreaseInAccruedInvestmentIncomeReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Premium receivables 48,608us-gaap_IncreaseDecreaseInPremiumsReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
34,907us-gaap_IncreaseDecreaseInPremiumsReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Accrued interest payable 18,269us-gaap_IncreaseDecreaseInInterestPayableNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
22,235us-gaap_IncreaseDecreaseInInterestPayableNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Amortization of insurance intangible assets 37,432us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
31,714us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net mark-to-market (gains) losses 2,918us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(6,607)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net realized investment gains (54,101)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(16,289)us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Losses on extinguishment of debt 93us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Other-than-temporary impairment charges 3,119us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
10,392us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Variable interest entity activities (6,962)us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOperatingIncomeOrLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
5,542us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOperatingIncomeOrLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Other, net 58,229us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
52,397us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net cash provided by operating activities 5,580us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
38,525us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Cash flows from investing activities:    
Proceeds from sales of bonds 487,462us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
276,555us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Proceeds from matured bonds 299,715us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
230,290us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Purchases of bonds (919,361)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(625,507)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Proceeds from sales of other invested assets 36,543us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
36,894us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Purchases of other invested assets (10,176)us-gaap_PaymentsToAcquireOtherInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(20,611)us-gaap_PaymentsToAcquireOtherInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Change in short-term investments 139,085us-gaap_PaymentsForProceedsFromShortTermInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
56,016us-gaap_PaymentsForProceedsFromShortTermInvestments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Loans, net 220us-gaap_PaymentsForProceedsFromLoansReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(71)us-gaap_PaymentsForProceedsFromLoansReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Change in swap collateral receivable (37,239)us-gaap_IncreaseDecreaseCashCollateralFromCounterparties
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(35,410)us-gaap_IncreaseDecreaseCashCollateralFromCounterparties
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Other, net 779us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(2,352)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net cash (used in) investing activities (2,972)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(84,196)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Cash flows from financing activities:    
Proceeds from warrant exercise 2us-gaap_ProceedsFromWarrantExercises
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1us-gaap_ProceedsFromWarrantExercises
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Payments for investment agreement draws (49,872)ambc_PaymentsFromDrawdownsOfBorrowingsUnderGuaranteedInvestmentAgreements
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0ambc_PaymentsFromDrawdownsOfBorrowingsUnderGuaranteedInvestmentAgreements
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net cash provided by (used in) financing activities (49,870)us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
1us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Net cash flow (47,262)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
(45,670)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Cash and cash equivalents at beginning of period 26,641us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
31,700us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Cash and cash equivalents end of period 73,903us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
77,370us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Supplemental disclosure of cash flow information:    
Income taxes 4,933us-gaap_IncomeTaxesPaid
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0us-gaap_IncomeTaxesPaid
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Interest on investment agreements 88ambc_InterestPaidOnInvestmentAgreements
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
202ambc_InterestPaidOnInvestmentAgreements
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Cash payments related to reorganization items:    
Professional fees paid for services rendered in connection with the Chapter 11 proceeding $ 0ambc_ProfessionalFeesPaidRelatingToChapterElevenProceeding
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ 81ambc_ProfessionalFeesPaidRelatingToChapterElevenProceeding
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember