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v2.4.1.9

Segment Information - Summary of Financial Information by Reportable Segment (Detail) (Successor [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Revenues: |  |  |
Total revenues before expenses and reorganization items | $ 155,491 us-gaap_Revenues | $ 109,138 us-gaap_Revenues |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 216,580 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 159,298 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Total assets | 25,386,610 us-gaap_Assets | 27,114,248 us-gaap_Assets | 25,159,864 us-gaap_Assets
Net investment income | 72,983 us-gaap_NetInvestmentIncome | 70,801 us-gaap_NetInvestmentIncome |
Amortization of insurance intangible assets | 37,432 us-gaap_AmortizationOfIntangibleAssets | 31,714 us-gaap_AmortizationOfIntangibleAssets |
Interest expense | 27,908 us-gaap_InterestExpenseDebt | 32,328 us-gaap_InterestExpenseDebt |
Reorganization items | 0 us-gaap_ReorganizationItems | 23 us-gaap_ReorganizationItems |
Unaffiliated Customers [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 154,463 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 109,138 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 215,552 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 159,298 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Equity Method Investee [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 1,028 us-gaap_Revenues / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 1,028 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Intersegment [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Financial Guarantee [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 192,071 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 162,928 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 255,466 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 208,001 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Total assets | 24,672,977 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 26,535,119 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net investment income | 71,470 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 70,384 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Amortization of insurance intangible assets | 37,432 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,714 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Interest expense | 27,585 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,881 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Financial Guarantee [Member] | Unaffiliated Customers [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 191,814 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 162,553 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 256,005 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 217,158 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Financial Guarantee [Member] | Equity Method Investee [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Financial Guarantee [Member] | Intersegment [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 257 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 375 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | (539)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (9,157)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Financial Services [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | (37,938)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (53,513)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | (38,892)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (54,904)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Total assets | 431,445 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 534,256 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net investment income | 128 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 394 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Amortization of insurance intangible assets | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Interest expense | 323 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 447 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Financial Services [Member] | Unaffiliated Customers [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | (37,708)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (53,438)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | (38,580)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (54,450)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Financial Services [Member] | Equity Method Investee [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Financial Services [Member] | Intersegment [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | (230)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (75)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | (312)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (454)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Corporate and Other [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 1,358 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 8,658 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 6,201 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Total assets | 282,188 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 44,873 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net investment income | 1,385 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 23 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Amortization of insurance intangible assets | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Interest expense | 0 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Corporate and Other [Member] | Unaffiliated Customers [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 357 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 23 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | (1,873)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (3,410)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Corporate and Other [Member] | Equity Method Investee [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 1,028 us-gaap_Revenues / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 1,028 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Corporate and Other [Member] | Intersegment [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | (27)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 8,635 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 851 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 9,611 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Inter-segment Eliminations [Member] | Intersegment [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (8,935)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Inter-segment Eliminations [Member] | Inter-segment Eliminations [Member] |  |  |
Revenues: |  |  |
Total revenues before expenses and reorganization items | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (8,935)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Pre-tax income (loss) from continuing operations: |  |  |
Pre-tax (loss) income from continuing operations | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Total assets | 0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
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