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Financial Guarantee Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Detail) (Successor Ambac [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 Transactions | Dec. 31, 2013 Transactions
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Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items] |  |
Count | 48 | 48
Gross loss reserve before subrogation recoveries | $ 3,086,342 | $ 3,163,772
Subrogation recoveries | (2,224,295) | (2,206,598)
Gross loss reserve after subrogation recoveries | 862,047 | 957,174
Adverse Samples [Member] |  |
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items] |  |
Count | 27 | 27
Gross loss reserve before subrogation recoveries | 2,009,647 | 2,084,911
Subrogation recoveries | (1,218,681) | (1,252,773)
Gross loss reserve after subrogation recoveries | 790,966 | 832,138
Random Samples [Member] |  |
Schedule Of Balance Of Rmbs Subrogation Recoveries And Related Claim Liabilities By Estimation Approach [Line Items] |  |
Count | 21 | 21
Gross loss reserve before subrogation recoveries | 1,076,695 | 1,078,861
Subrogation recoveries | (1,005,614) | (953,825)
Gross loss reserve after subrogation recoveries | $ 71,081 | $ 125,036

X
- Definition Number of total remediation transactions. + References No definition available. + Details
Name: | ambc_NumberOfRemediationTransactions
Namespace Prefix: | ambc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ambc_ScheduleOfBalanceOfRmbsSubrogationRecoveriesAndRelatedClaimLiabilitiesByEstimationApproachLineItems
Namespace Prefix: | ambc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the reduction to gross claim liability for subrogation on insured RMBS financial obligations with credit deterioration. + References No definition available. + Details
Name: | ambc_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityRmbsSubrogation
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the related gross claim liability net of subrogation recoveries for RMBS financial guarantee insurance contracts with credit deterioration that have estimated subrogation recoveries. + References No definition available. + Details
Name: | ambc_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationRmbsGrossClaimLiabilitiesAfterSubrogationRecoveries
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This element represents the related gross claim liability for RMBS financial guarantee insurance contracts with credit deterioration that have estimated subrogation recoveries. + References No definition available. + Details
Name: | ambc_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationRmbsGrossClaimLiabilitiesBeforeSubrogationRecoveries
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant