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v2.4.1.9

Segment Information - Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2013 | Mar. 31, 2013 | Apr. 30, 2013 | Dec. 31, 2012 | 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
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 28,853,435 us-gaap_Assets |  | $ 28,853,435 us-gaap_Assets |  |  |  |  |  |  |  |  |  |
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations | 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 |  |  |  |  |  |  |  |  |
Total assets | 28,853,435 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 28,853,435 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 27,085,265 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Net investment income | 32,226 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 84,514 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 116,740 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 382,902 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Amortization of insurance intangible assets | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Interest expense | 7,860 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 23,165 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 31,025 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 112,320 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Predecessor [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 640,388 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 685,689 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | 3,348,033 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (256,505)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
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_PredecessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Financial Guarantee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 633,950 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 763,520 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | 1,831,105 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (162,217)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Total assets | 28,287,321 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 28,287,321 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 26,519,480 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Net investment income |  |  | 115,129 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 365,912 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Interest expense |  |  | 29,718 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 105,973 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Reorganization items |  |  | (1,231,550)us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Financial Guarantee [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 633,010 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 758,331 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | 1,831,237 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (162,797)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Financial Guarantee [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 940 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 5,189 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | (132)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 580 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 6,457 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (77,969)us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | 2,293 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (88,204)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Total assets | 536,711 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 536,711 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 533,528 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Net investment income |  |  | 1,572 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 16,769 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Interest expense |  |  | 1,307 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 6,347 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Reorganization items |  |  | 1,505 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Financial Services [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 7,339 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (72,977)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | 3,394 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (82,429)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Financial Services [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | (882)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (4,992)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | (1,101)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (5,775)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 39 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 980 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | 1,514,635 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (6,084)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Total assets | 29,403 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 29,403 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 32,257 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Net investment income |  |  | 39 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 221 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Interest expense |  |  | 0 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Reorganization items |  |  | (1,515,135)us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 7,215 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Corporate and Other [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 39 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 335 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | 1,513,402 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (11,279)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Predecessor [Member] | Corporate and Other [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 0 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 645 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  | 1,233 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 5,195 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
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
Pre-tax income (loss) from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax (loss) income from continuing operations |  |  |  |  | 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
Total assets | 28,853,435 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 28,853,435 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | 25,159,864 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  | 27,092,477 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 27,092,477 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 25,159,864 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net investment income |  |  |  |  | 26,196 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 66,471 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 83,581 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 80,093 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 70,801 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 68,124 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 52,126 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 146,446 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 300,946 us-gaap_NetInvestmentIncome / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Amortization of insurance intangible assets |  |  |  |  | 24,952 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 41,952 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 41,908 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 36,256 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,714 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 37,233 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 37,473 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 99,658 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 151,830 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Interest expense |  |  |  |  | 21,144 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,354 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,841 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,953 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 32,328 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,989 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 31,817 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 84,950 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 127,476 us-gaap_InterestExpenseDebt / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
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
Successor [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 581,048 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 327,275 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 |  |  |  |  |  |  |  |  |  |  |  | 512,316 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 491,858 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  |  | 1,395 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 |  |  |  |  |  |  |  |  |  |  |  |  | 1,395 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | 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
Successor [Member] | Financial Guarantee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 466,538 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 507,801 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 |  |  |  |  |  |  |  |  |  |  |  | 184,786 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 659,307 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Total assets |  |  |  |  |  | 24,444,514 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  | 26,582,635 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 26,582,635 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 24,444,514 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net investment income |  |  |  |  |  |  |  |  |  |  |  | 145,269 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 298,020 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Amortization of insurance intangible assets |  |  |  |  |  |  |  |  |  |  |  | 99,658 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 151,830 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 83,595 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 125,892 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Reorganization items |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Financial Guarantee [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 464,701 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 506,558 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 |  |  |  |  |  |  |  |  |  |  |  | 405,004 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 684,750 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | 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
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
Successor [Member] | Financial Guarantee [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 1,837 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,243 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 |  |  |  |  |  |  |  |  |  |  |  | (220,218)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (25,443)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_FinancialGuaranteeMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Financial Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 114,967 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (180,888)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 |  |  |  |  |  |  |  |  |  |  |  | 111,703 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (184,486)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Total assets |  |  |  |  |  | 436,072 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  | 472,886 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 472,886 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 436,072 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net investment income |  |  |  |  |  |  |  |  |  |  |  | 1,115 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,123 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 |  |  |  |  |  |  |  |  |  |  |  | 1,355 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,584 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Reorganization items |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Financial Services [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 116,177 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (179,691)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 |  |  |  |  |  |  |  |  |  |  |  | 113,347 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (182,941)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | 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
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
Successor [Member] | Financial Services [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | (1,210)us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (1,197)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 |  |  |  |  |  |  |  |  |  |  |  | (1,644)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (1,545)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = ambc_FinancialServicesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 219,351 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 25,102 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 |  |  |  |  |  |  |  |  |  |  |  | 215,827 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 18,432 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Total assets |  |  |  |  |  | 279,278 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  | 36,956 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 36,956 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 279,278 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Net investment income |  |  |  |  |  |  |  |  |  |  |  | 62 us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,803 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
Reorganization items |  |  |  |  |  |  |  |  |  |  |  | 493 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 211 us-gaap_ReorganizationItems / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Corporate and Other [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 170 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 408 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 |  |  |  |  |  |  |  |  |  |  |  | (6,035)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (9,951)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Corporate and Other [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  |  | 1,395 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 |  |  |  |  |  |  |  |  |  |  |  |  | 1,395 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Corporate and Other [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 219,181 us-gaap_Revenues / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 23,299 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 |  |  |  |  |  |  |  |  |  |  |  | 221,862 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 26,988 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Inter-segment Eliminations [Member] | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | (58)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (842)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
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_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Net investment income |  |  | 0 us-gaap_NetInvestmentIncome / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_NetInvestmentIncome / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Interest expense |  |  | 0 us-gaap_InterestExpenseDebt / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_InterestExpenseDebt / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Reorganization items |  |  | 0 us-gaap_ReorganizationItems / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_ReorganizationItems / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Inter-segment Eliminations [Member] | Predecessor [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
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_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Inter-segment Eliminations [Member] | Predecessor [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  | (58)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (842)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
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_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |
Inter-segment Eliminations [Member] | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | (219,808)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = 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_StatementScenarioAxis = us-gaap_SuccessorMember |
Total assets |  |  |  |  |  |  |  |  |  | 0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Net investment income |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_NetInvestmentIncome / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Amortization of insurance intangible assets |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_InterestExpenseDebt / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Reorganization items |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ReorganizationItems / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Inter-segment Eliminations [Member] | Successor [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / 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 |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Inter-segment Eliminations [Member] | Successor [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  | (219,808)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (23,345)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / 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_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |
Inter-segment Eliminations [Member] | Successor [Member] | Inter-segment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  |  | (23,345)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
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
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_NetInvestmentIncome / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Amortization of insurance intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_InterestExpenseDebt / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Reorganization items |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ReorganizationItems / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Inter-segment Eliminations [Member] | Successor [Member] | Inter-segment Eliminations [Member] | Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / 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_MajorCustomersAxis = ambc_UnaffiliatedCustomersMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Inter-segment Eliminations [Member] | Successor [Member] | Inter-segment Eliminations [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / 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_MajorCustomersAxis = us-gaap_EquityMethodInvesteeMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Inter-segment Eliminations [Member] | Successor [Member] | Inter-segment Eliminations [Member] | Intersegment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
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_MajorCustomersAxis = ambc_IntersegmentMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

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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 Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + 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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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7 + Details
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- Definition Total amount of reorganization items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55730-112764 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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