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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014
Loss Contingencies [Line Items] |
Number of RMBS Trustees Filing Suit | 5 ambc_NumberofInsurancePoliciesRelatedtoRMBSSecuritizations
Litigation Settlement, Expense | $ 207 us-gaap_LitigationSettlementExpense

X
- Definition Number of Insurance Policies Related to RMBS Securitizations + References No definition available. + Details
Name: | ambc_NumberofInsurancePoliciesRelatedtoRMBSSecuritizations
Namespace Prefix: | ambc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration