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Financial Guarantee Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Insurance [Abstract]
Unpaid claims on policies allocated to Segregated Account	$ 3,904,315	$ 3,388,133

X

- Definition

Unpaid claims allocated to the Segregated Account on permitted policy claims.

+ References

No definition available.

+ Details

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

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- Details

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