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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended |  |
--- | --- | --- | ---
Jul. 11, 2013 | Aug. 02, 2013 Policies | Apr. 30, 2013 Ambac [Member] | Apr. 30, 2013 Segregated Account [Member]
Loss Contingencies [Line Items] |  |  |  |
Minimum percentage of payments on permitted policy claims | 25.00% |  |  |
Number of policies considered for Supplemental Payments |  | 14 |  |
Payment to settle the IRS dispute and related proceedings |  |  | $ 1,900 | $ 100,000

X
- Definition Minimum Percentage Share Of Continent Liabilities + References No definition available. + Details
Name: | ambc_MinimumPercentageShareOfContinentLiabilities
Namespace Prefix: | ambc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of policies considered for Supplemental Payments. + References No definition available. + Details
Name: | ambc_NumberOfPoliciesForSupplementalPayments
Namespace Prefix: | ambc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount paid to settle bankruptcy claim. + References No definition available. + Details
Name: | us-gaap_BankruptcyClaimsAmountPaidToSettleClaims
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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