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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Apr. 30, 2013 | Dec. 31, 2012
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered | $ (1,108)ambc_CededLossAndLossExpensesPaidNotYetRecovered | $ (517)ambc_CededLossAndLossExpensesPaidNotYetRecovered |  |
Prior years: |  |  |  |
Add reinsurance on loss and loss expense reserves | 122,357 ambc_LossReservesCededToReinsurers | 100,355 ambc_LossReservesCededToReinsurers |  |
Successor [Member] |  |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded | (14,106)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (21,164)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Beginning gross loss and loss expense reserves | 5,572,672 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 5,470,234 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Less reinsurance on loss and loss expense reserves | 138,155 ambc_LossReservesCededToReinsurers / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 122,357 ambc_LossReservesCededToReinsurers / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Beginning balance of net loss and loss expense reserves | 5,434,517 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 5,347,877 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Current year: |  |  |  |
ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear | 97,342 ambc_Ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 309 ambc_Ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Claim and loss expense payments, net of subrogation and reinsurance | 442 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 17 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Establishment of RMBS subrogation recoveries, net of reinsurance | (315)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseEstablishmentOfSubrogationRecoveriesCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 0 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseEstablishmentOfSubrogationRecoveriesCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Total current year | 96,585 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 292 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Prior years: |  |  |  |
Change in previously established loss and loss expense reserves, gross of RMBS subrogation and net of reinsurance | (514,728)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInPreviouslyEstablishedLossReservesPriorYears / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (269,606)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInPreviouslyEstablishedLossReservesPriorYears / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance | (59,184)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,067,321 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Change in previously established RMBS subrogation recoveries, net of reinsurance | 272,319 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInEstablishedSubrogationRecoveriesPriorYears / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (312,864)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInEstablishedSubrogationRecoveriesPriorYears / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Liability For Unpaid Claims And Claims Adjustment Expense Change In Loss Reserves Prior Year | (183,225)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesPriorYear / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (1,649,791)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesPriorYear / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Net change in loss and loss expense reserves | (86,640)ambc_ChangeInLossAndLossExpenseReservesNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | (1,649,499)ambc_ChangeInLossAndLossExpenseReservesNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Consolidation Of Variable Interest Entities On Loss And Loss Adjustment Expense Reserves |  | 0 ambc_ConsolidationOfVariableInterestEntitiesOnLossAndLossAdjustmentExpenseReserves / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Net | 5,347,877 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 3,698,378 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Add reinsurance on loss and loss expense reserves | 122,357 ambc_LossReservesCededToReinsurers / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 100,355 ambc_LossReservesCededToReinsurers / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Ending gross loss and loss expense reserves | 5,470,234 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 3,798,733 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Predecessor [Member] |  |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |
Ceded Loss And Loss Expenses Paid Not Yet Recovered |  |  | 1,879 ambc_CededLossAndLossExpensesPaidNotYetRecovered / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 675 ambc_CededLossAndLossExpensesPaidNotYetRecovered / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Policyholder Benefits and Claims Incurred, Ceded |  |  | 3,889 us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 6,996 us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |  |
Beginning gross loss and loss expense reserves |  |  | 6,122,140 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 6,384,260 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Less reinsurance on loss and loss expense reserves |  |  | 147,409 ambc_LossReservesCededToReinsurers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 153,480 ambc_LossReservesCededToReinsurers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Beginning balance of net loss and loss expense reserves |  |  | 5,974,731 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 6,230,780 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Current year: |  |  |  |
ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear |  |  | 2,748 ambc_Ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 464,058 ambc_Ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Claim and loss expense payments, net of subrogation and reinsurance |  |  | 58 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 20,765 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Establishment of RMBS subrogation recoveries, net of reinsurance |  |  | (159)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseEstablishmentOfSubrogationRecoveriesCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseEstablishmentOfSubrogationRecoveriesCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Total current year |  |  | 2,531 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 443,293 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesCurrentYear / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Prior years: |  |  |  |
Change in previously established loss and loss expense reserves, gross of RMBS subrogation and net of reinsurance |  |  | (52,642)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInPreviouslyEstablishedLossReservesPriorYears / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 72,700 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInPreviouslyEstablishedLossReservesPriorYears / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance |  |  | (20,902)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 944,860 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Change in previously established RMBS subrogation recoveries, net of reinsurance |  |  | (12,596)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInEstablishedSubrogationRecoveriesPriorYears / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 172,818 ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInEstablishedSubrogationRecoveriesPriorYears / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Liability For Unpaid Claims And Claims Adjustment Expense Change In Loss Reserves Prior Year |  |  | (44,336)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesPriorYear / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (699,342)ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesPriorYear / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Net change in loss and loss expense reserves |  |  | (41,805)ambc_ChangeInLossAndLossExpenseReservesNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | (256,049)ambc_ChangeInLossAndLossExpenseReservesNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Consolidation Of Variable Interest Entities On Loss And Loss Adjustment Expense Reserves | 0 ambc_ConsolidationOfVariableInterestEntitiesOnLossAndLossAdjustmentExpenseReserves / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  | (498,409)ambc_ConsolidationOfVariableInterestEntitiesOnLossAndLossAdjustmentExpenseReserves / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 ambc_ConsolidationOfVariableInterestEntitiesOnLossAndLossAdjustmentExpenseReserves / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Liability for Unpaid Claims and Claims Adjustment Expense, Net |  |  | 5,434,517 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 5,974,731 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Add reinsurance on loss and loss expense reserves |  |  | 138,155 ambc_LossReservesCededToReinsurers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 147,409 ambc_LossReservesCededToReinsurers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Ending gross loss and loss expense reserves |  |  | $ 5,572,672 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 6,122,140 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- Definition ambc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the loss and loss expense reserve accounts, net of subrogation and reinsurance. + References No definition available. + Details
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- Definition Increase (decrease) during the reporting period in the loss and loss expense accounts for consolidation and or deconsolidation of variable interest entities. + References No definition available. + Details
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- Definition Liability for Unpaid Claims and Claims Adjustment Expense Change in Established Subrogation Recoveries Prior Years + References No definition available. + Details
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- Definition Liability for unpaid claims and claims adjustment expense change in loss reserves current year. + References No definition available. + Details
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- Definition Liability for Unpaid Claims and Claims Adjustment Expense Change in Previously Established Loss Reserves Prior Years + References No definition available. + Details
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- Definition Liability for unpaid claims and claims adjustment expense establishment of subrogation recoveries current year, net of reinsurance. + References No definition available. + Details
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- Definition The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims expected to be paid or incurred by the ceding insurer. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Amount of payments to settle claims incurred in prior periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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- Definition Amount of reduction of provision for policy benefits and costs incurred for policies ceded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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