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Commitments and Contingencies - Additional Information (Detail) $ in Billions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Loss Contingencies [Line Items] |
General Obligation Bonds Issued in 2012 and 2014 | $ 6

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- Definition General Obligation Bonds Issued in 2012 and 2014 + References No definition available. + Details
Name: | ambc_GeneralObligationBondsIssuedin2012and2014
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration