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Background and Business Description Background and Business Description - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
December 2014 Payment of Deferred Amounts	$ 1,137,500
December 2014 Redemption of Surplus Notes	$ 413,587

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- Definition

Estimated payment of Deferred Amounts, including accrued interest, that will be paid by the Segregated Account in December 2014 as required by the Rehabilitator of the Segregated Account.

+ References

No definition available.

+ Details

Name:	ambc_December2014PaymentofDeferredAmounts
Namespace Prefix:	ambc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Estimated payment of Surplus Notes (including accrued interest) that will be paid by the Segregated Account and Ambac Assurance in November 2014. Such amounts have been approved by the regulator of both Ambac Assurance and the Segregated Account in October 2014.

+ References

No definition available.

+ Details

Name:	ambc_November2014PaymentofSurplusNotes
Namespace Prefix:	ambc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration