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Financial Guarantee Insurance - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Detail) | Dec. 31, 2024
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Summary of Ceded Par and Net Unsecured Reinsurance Recoverable [Line Items] |
Percentage of Ceded Reinsurance Recoverable Represented by Top Three | 69.00%

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- Definition Percentage of Ceded Reinsurance Recoverable Represented by Top Three + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Summary of Ceded Par and Net Unsecured Reinsurance Recoverable [Line Items] + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:stringItemType
Balance Type: | na
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