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Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivatives (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Notional outstanding | $ 1,594,571 invest_DerivativeNotionalAmount | $ 1,529,759 invest_DerivativeNotionalAmount
Successor [Member] | CLO [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Notional outstanding | 466,453 invest_DerivativeNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 549,923 invest_DerivativeNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Weighted average reference obligation price | $ 99.1 ambc_FairValueInputWeightedAverageObligationPrice / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 98.9 ambc_FairValueInputWeightedAverageObligationPrice / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Weighted average life (WAL) in years | 1 year 6 months | 1 year 9 months
Weighted average credit rating | AA | AA
Weighted average relative change ratio | 36.20%ambc_FairValueInputWeightedAverageRelativeChangeRatio / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 35.90%ambc_FairValueInputWeightedAverageRelativeChangeRatio / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
CVA percentage | 5.21%ambc_PercentageOfCreditValueAdjustment / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 5.40%ambc_PercentageOfCreditValueAdjustment / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Fair value of derivative liabilities | 1,533 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 2,027 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_CollateralizedLoanObligationsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Other [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Notional outstanding | 1,069,317 invest_DerivativeNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 921,036 invest_DerivativeNotionalAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Weighted average reference obligation price | $ 86.8 ambc_FairValueInputWeightedAverageObligationPrice / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 86.8 ambc_FairValueInputWeightedAverageObligationPrice / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Weighted average life (WAL) in years | 5 years 9 months | 5 years 8 months
Weighted average credit rating | BBB | BBB-
Weighted average relative change ratio | 44.80%ambc_FairValueInputWeightedAverageRelativeChangeRatio / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 49.00%ambc_FairValueInputWeightedAverageRelativeChangeRatio / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
CVA percentage | 19.34%ambc_PercentageOfCreditValueAdjustment / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 15.82%ambc_PercentageOfCreditValueAdjustment / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Fair value of derivative liabilities | $ 74,794 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | $ 71,104 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_UnderlyingOtherMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember

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- Definition Fair value input weighted average credit rating. + References No definition available. + Details
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- Definition Fair value input weighted average life. + References No definition available. + Details
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- Definition Fair value input weighted average obligation price. + References No definition available. + Details
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Balance Type: | na
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- Definition Fair value input weighted average relative change ratio. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Credit valuation adjustment (CVA) as a percentage of the credit derivative liability calculated excluding the CVA. + References No definition available. + Details
Name: | ambc_PercentageOfCreditValueAdjustment
Namespace Prefix: | ambc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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Balance Type: | credit
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- Details
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