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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statement of Total Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 2 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2014 | Apr. 30, 2013 | Mar. 31, 2013 | Apr. 30, 2013 | Dec. 31, 2012
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  | $ 4,364 us-gaap_OtherIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 12,498 us-gaap_OtherIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Net realized investment gains |  |  |  |  |  |  |  | (4,467)us-gaap_RealizedInvestmentGainsLosses / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (58,777)us-gaap_RealizedInvestmentGainsLosses / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  | 581,048 us-gaap_Revenues / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 328,670 us-gaap_Revenues / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization items | 424 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 2 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 186 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 23 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 65 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 4 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 493 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 211 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries | 205,795 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 459,594 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 84,773 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (210,412)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 159,298 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 74,920 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 231,601 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 512,316 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 493,253 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  | (7,514)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (9,557)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | 504,802 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 483,696 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | 504,802 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 483,696 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  | (41,910)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 252,603 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 |  |  |  |  |  |  |  | 43,165 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (43,599)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Total other comprehensive income |  |  |  |  |  |  |  | 12,102 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 208,188 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Total comprehensive income (loss) attributable to Ambac Financial Group, Inc. |  |  |  |  |  |  |  | 516,880 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 692,693 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  | 8,363 us-gaap_OtherIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 106,098 us-gaap_OtherIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Net realized investment gains |  |  |  |  |  |  |  |  |  |  |  | (53,305)us-gaap_RealizedInvestmentGainsLosses / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (72,101)us-gaap_RealizedInvestmentGainsLosses / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 640,388 us-gaap_Revenues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 685,689 us-gaap_Revenues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Reorganization items |  |  |  |  |  |  |  |  |  | (2,747,239)us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 2,059 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (2,745,180)us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 7,215 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  |  |  | 3,065,124 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 282,909 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 3,348,033 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (256,505)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | (755)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (2,849)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 3,347,278 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (259,354)us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 3,347,278 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (259,354)us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  |  |  |  | 175,347 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 166,252 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  |  |  |  | (428)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (540)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total other comprehensive income |  |  |  |  |  |  |  |  |  |  |  | 175,104 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 161,920 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total comprehensive income (loss) attributable to Ambac Financial Group, Inc. |  |  |  |  |  |  |  |  |  |  |  | 3,523,924 us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (94,552)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ambac Financial Group, Inc Parent Company Only [Member] | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  | 22,227 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 25,147 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Other income |  |  |  |  |  |  |  | 197,122 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Net realized investment gains |  |  |  |  |  |  |  | (2)us-gaap_RealizedInvestmentGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 46 us-gaap_RealizedInvestmentGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  | 219,351 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 25,101 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  | 3,018 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 6,458 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Total expenses |  |  |  |  |  |  |  | 3,018 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 6,458 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Income (loss) before income taxes, reorganization costs and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  | 216,333 ambc_Ambc_IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 18,643 ambc_Ambc_IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Reorganization items |  |  |  |  |  |  |  | 493 us-gaap_ReorganizationItems / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 211 us-gaap_ReorganizationItems / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  | 215,840 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 18,432 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (221)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Income (loss) before equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  | 215,840 ambc_Ambc_NetLossBeforeEquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 18,211 ambc_Ambc_NetLossBeforeEquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  | 289,379 ambc_EquityInUndistributedNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 465,860 ambc_EquityInUndistributedNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | 505,219 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 484,071 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | 505,219 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 484,071 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  | (41,910)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 252,603 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 |  |  |  |  |  |  |  | 42,724 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (43,165)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Changes to postretirement benefit, net of tax |  |  |  |  |  |  |  | 10,847 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (816)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Total other comprehensive income |  |  |  |  |  |  |  | 11,661 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 208,622 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Total comprehensive income (loss) attributable to Ambac Financial Group, Inc. |  |  |  |  |  |  |  | 516,880 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 692,693 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Ambac Financial Group, Inc Parent Company Only [Member] | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 39 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 221 us-gaap_InterestIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Other income |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 758 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Net realized investment gains |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_RealizedInvestmentGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_RealizedInvestmentGainsLosses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 39 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 979 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  | 539 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (151)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total expenses |  |  |  |  |  |  |  |  |  |  |  | 539 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (151)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Income (loss) before income taxes, reorganization costs and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | (500)ambc_Ambc_IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 1,130 ambc_Ambc_IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Reorganization items |  |  |  |  |  |  |  |  |  |  |  | (2,745,180)us-gaap_ReorganizationItems / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 7,215 us-gaap_ReorganizationItems / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 2,744,680 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (6,085)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  | 703 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 136 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Income (loss) before equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 2,745,383 ambc_Ambc_NetLossBeforeEquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (5,949)ambc_Ambc_NetLossBeforeEquityInNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  |  |  |  | 603,666 ambc_EquityInUndistributedNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (250,729)ambc_EquityInUndistributedNetIncomeLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 3,349,049 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (256,678)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 3,349,049 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (256,678)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  |  |  |  | 175,347 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 166,252 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  |  |  |  | (657)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (334)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Changes to postretirement benefit, net of tax |  |  |  |  |  |  |  |  |  |  |  | 185 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (3,792)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total other comprehensive income |  |  |  |  |  |  |  |  |  |  |  | 174,875 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 162,126 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total comprehensive income (loss) attributable to Ambac Financial Group, Inc. |  |  |  |  |  |  |  |  |  |  |  | $ 3,523,924 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ (94,552)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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