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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 | $ 65,718 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 82,547 us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net investment income: |  |
Securities available-for-sale and short-term | 63,332 us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 68,807 us-gaap_InterestAndDividendIncomeSecuritiesAvailableForSale / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other investments | 9,651 ambc_OtherInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,994 ambc_OtherInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Total net investment income | 72,983 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 70,801 us-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 | 7,242 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-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 | 54,101 ambc_NetRealizedInvestmentGainsLosses / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 16,289 ambc_NetRealizedInvestmentGainsLosses / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Change in fair value of credit derivatives: |  |
Realized gains and other settlements | 419 ambc_RealizedGainsLossesAndOtherSettlements / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 775 ambc_RealizedGainsLossesAndOtherSettlements / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Unrealized gains (losses) | (2,918)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 6,607 us-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 | 7,382 us-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 | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other income (expense) | (788)us-gaap_OtherIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,894 us-gaap_OtherIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Income (loss) on variable interest entities | 6,962 us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOperatingIncomeOrLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (5,542)us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityOperatingIncomeOrLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Total revenues | 155,491 us-gaap_Revenues / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 109,138 us-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 | 37,432 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,714 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Underwriting and operating expenses | 24,523 us-gaap_OtherUnderwritingExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 25,786 us-gaap_OtherUnderwritingExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Interest expense | 27,908 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 32,328 us-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 | 216,580 ambc_IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 159,321 ambc_IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Reorganization items | 0 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 23 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Pre-tax income | 216,580 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 159,298 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Provision for income taxes | 1,709 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 3,249 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net income (loss) | 214,871 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 156,049 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Less: net (gain) loss attributable to noncontrolling interest | 160 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 107 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net income attributable to common shareholders | 214,711 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 155,942 us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Other comprehensive income (loss), after tax: |  |
Net income (loss) | 214,871 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 156,049 us-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 | 88,722 us-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 | 4,284 us-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 | 92,802 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Total comprehensive income | 163,591 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 248,851 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Less: comprehensive (loss) gain attributable to the noncontrolling interest: |  |
Net (gain) loss | 160 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 107 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Currency translation adjustments | (326)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 46 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Total comprehensive income attributable to Ambac Financial Group, Inc. | $ 163,757 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 248,698 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net income per share attributable to Ambac Financial Group, Inc. common shareholders: | $ 4.75 us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 3.46 us-gaap_EarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Basic | $ 4.57 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 3.31 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

X
- Definition Income (loss) from continuing operations before reorganization items and income taxes + References No definition available. + Details
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- Definition This element represents the total realized gains (losses) included in earnings for the period as a result of selling investment securities. This element does not include any losses recognized for other-than-temporary impairments of investment securities. + References No definition available. + Details
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- Definition Other investment income not specified in the taxonomy. + References No definition available. + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References No definition available. + Details
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- Definition This element represents premiums received and receivable on credit derivative contracts, premiums paid and accrued on purchased contracts and net losses and settlements, that is included in earnings. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5,6,7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5, 6, 7 -Article 7 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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