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

X

- 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