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Financial Guarantee Insurance Contracts - Summary of Rollforward of RMBS Subrogation, by Estimation Approach (Detail) - Successor [Member] - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Subrogation By Estimation Approach [Roll Forward] |  |
Discounted RMBS subrogation (gross of reinsurance), beginning balance | $ 2,523,540 | $ 2,206,598
Changes recognized |  |
Additional Transactions Reviewed Changes in RMBS Subrogation |  | 24,565
Changes in Estimation Approach In Rmbs Subrogation |  | 53,851
Impact of sponsor actions | 0 | (90,000)
Other Changes Rmbs Subrogation | 31,921 | 19,416
Discounted RMBS subrogation (gross of reinsurance), ending balance | 2,555,461 | 2,214,430
Random Samples [Member] |  |
Subrogation By Estimation Approach [Roll Forward] |  |
Discounted RMBS subrogation (gross of reinsurance), beginning balance | 2,523,540 | 953,825
Changes recognized |  |
Additional Transactions Reviewed Changes in RMBS Subrogation |  | 24,565
Changes in Estimation Approach In Rmbs Subrogation |  | 1,272,532
Impact of sponsor actions | 0 | (90,000)
Other Changes Rmbs Subrogation | 31,921 | 53,508
Discounted RMBS subrogation (gross of reinsurance), ending balance | 2,555,461 | 2,214,430
Adverse Samples [Member] |  |
Subrogation By Estimation Approach [Roll Forward] |  |
Discounted RMBS subrogation (gross of reinsurance), beginning balance | 0 | 1,252,773
Changes recognized |  |
Additional Transactions Reviewed Changes in RMBS Subrogation |  | 0
Changes in Estimation Approach In Rmbs Subrogation |  | (1,218,681)
Impact of sponsor actions | 0 | 0
Other Changes Rmbs Subrogation | 0 | (34,092)
Discounted RMBS subrogation (gross of reinsurance), ending balance | $ 0 | $ 0

X
- Definition This element represents the change in subrogation due to additional transactions reviewed. + References No definition available. + Details
Name: | ambc_AdditionalTransactionsReviewedChangesinRMBSSubrogation
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Changes Recognized in Residential Mortgage Backed Security [Abstract] + References No definition available. + Details
Name: | ambc_ChangesRecognizedInResidentialMortgageBackedSecurityAbstract
Namespace Prefix: | ambc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the change in subrogation due to changes in estimation approach. + References No definition available. + Details
Name: | ambc_ChangesinEstimationApproachInRmbsSubrogation
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The change in RMBS subrogation due to the impact of sponsor actions which includes loan repurchases, direct payments, and other contributions from sponsors. + References No definition available. + Details
Name: | ambc_ImpactOfSponsorActionsInResidentialMortgageBackedSecuritiesSubrogation
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the changes in RMBS subrogation for reasons other than additional transactions being reviewed, adverse loans being reviewed or due to adverse loans being repurchased by the sponsor. + References No definition available. + Details
Name: | ambc_OtherChangesRmbsSubrogation
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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: | credit
Period Type: | instant

X
- Definition Subrogation By Estimation Approach [Roll Forward] + References No definition available. + Details
Name: | ambc_SubrogationByEstimationApproachRollForward
Namespace Prefix: | ambc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_SuccessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateWriteDownOrReserveByLoanAxis=ambc_RandomSamplesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateWriteDownOrReserveByLoanAxis=ambc_AdverseSamplesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |