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v2.4.1.9

Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2013 | Apr. 30, 2013 | Mar. 31, 2013 | Apr. 30, 2013 | Dec. 31, 2012
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Amounts and Junior Deferred Amounts Accrued Interest Rate | 5.10%ambc_DeferredAmountsandJuniorDeferredAmountsAccruedInterestRate |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |  | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  |  |  |  |  |  |  |  |  |  | $ 514,511 us-gaap_Goodwill |  | $ 514,511 us-gaap_Goodwill |
Currency Translation, Weighted Average Risk Free Discount Rate | 2.70%ambc_EstimatedFuturePremiumPaymentsWeightedAverageDiscountedRate | 3.00%ambc_EstimatedFuturePremiumPaymentsWeightedAverageDiscountedRate |  | 2.70%ambc_EstimatedFuturePremiumPaymentsWeightedAverageDiscountedRate |  |  |  | 3.00%ambc_EstimatedFuturePremiumPaymentsWeightedAverageDiscountedRate |  | 3.00%ambc_EstimatedFuturePremiumPaymentsWeightedAverageDiscountedRate |  |  |  |
Financial Guarantee Insurance Contracts, Premium Received over Contract Period, Premium Receivable, Weighted Average Collection Period | 10 years 1 month 6 days | 9 years 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Goodwill recorded in connection with emergence from Chapter 11 | 0 ambc_GoodwillWrittenoffRelatedtoBankruptcyClaimBankruptcyClaim / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  |  | 514,511 ambc_GoodwillWrittenoffRelatedtoBankruptcyClaimBankruptcyClaim / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Accumulated impairment loss | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Ending balance | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 514,511 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount | 29,964 us-gaap_FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  |  | 56,541 us-gaap_FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
U.S. Trustee Fees | 7 us-gaap_DebtorReorganizationItemsDebtorInPossessionFacilityFinancingCosts / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  |  | 33 us-gaap_DebtorReorganizationItemsDebtorInPossessionFacilityFinancingCosts / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Professional fees | 204 us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  |  | 460 us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Gain From Cancellation and Satisfaction of Predecessor Ambac Debt | 0 us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  |  | 0 us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Fresh Start Adjustments | 0 ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |  |  | 0 ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Reorganization items | 211 us-gaap_ReorganizationItems / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 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 |  |  |  |
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Policy Acquisition Cost, Amortization Expense |  |  |  |  |  |  |  |  |  |  |  |  | 6,480 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 25,465 us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 0 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |  |  |  |  |  |  | 0 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Goodwill recorded in connection with emergence from Chapter 11 |  |  |  |  |  |  |  |  |  |  |  |  | 0 ambc_GoodwillWrittenoffRelatedtoBankruptcyClaimBankruptcyClaim / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_GoodwillWrittenoffRelatedtoBankruptcyClaimBankruptcyClaim / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Accumulated impairment loss |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ending balance |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | 0 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount |  |  |  |  |  |  |  |  |  |  |  |  | 36,433 us-gaap_FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 127,628 us-gaap_FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
U.S. Trustee Fees |  |  |  |  |  |  |  |  |  |  |  |  | 23 us-gaap_DebtorReorganizationItemsDebtorInPossessionFacilityFinancingCosts / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 50 us-gaap_DebtorReorganizationItemsDebtorInPossessionFacilityFinancingCosts / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Professional fees |  |  |  |  |  |  |  |  |  |  |  |  | 4,483 us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 7,165 us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Gain From Cancellation and Satisfaction of Predecessor Ambac Debt |  |  |  |  |  |  |  |  |  |  |  |  | (1,521,435)us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_DebtorReorganizationItemsGainLossOnSettlementOfOtherClaimsNet1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Fresh Start Adjustments |  |  |  |  |  |  |  |  |  |  |  |  | (1,228,251)ambc_DebtorReorganizationItemsFreshStartAdjustments / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_DebtorReorganizationItemsFreshStartAdjustments / 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

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- Definition Impact of the fresh start adjustments on Predecessor's Consolidated Statements of Total Comprehensive Income + References No definition available. + Details
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- Definition Reflects the effective interest rate on Deferred Amounts and Junior Deferred Amounts of the Segregated Account of Ambac as directed by the Rehabilitator of the Segregated Account. + References No definition available. + Details
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Balance Type: | na
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- Definition Weighted average discounted rate of estimated future premium payments to be paid by the VIEs. + References No definition available. + Details
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- Definition Goodwill, Written off Related to Bankruptcy Claim Bankruptcy Claim + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of reorganization items related to debtor-in-possession facility financing costs. + 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 net gain (loss) on settlement of other claims for entities in bankruptcy, reported as a reorganization item. + 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 reorganization items related to legal and advisory professional fees related to entities in bankruptcy. + 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 expense related to deferred policy acquisition costs. + 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 210.7-04.7(a)) -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 7 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28247317&loc=d3e10157-158409 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6480726&loc=d3e6691-158385 + Details
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- Definition This element represents the amount of premium revenue on financial guarantee insurance contracts recognized during the period that was accelerated for revenue recognition purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6933581&loc=SL5749298-161291 + Details
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- Definition Weighted average period over which premium receivable for financial guarantee insurance contracts is collected where premium is received over the contract period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=6933075&loc=SL5748726-161290 + Details
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- Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- 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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