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Financial Guarantee Insurance Contracts - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Reinsurance Recoverables [Line Items]
Percentage ceded par	100.00%
Net unsecured reinsurance recoverable	$ 13,370
Assured Guaranty Re Ltd [Member] | Stable [Member] | Moody's, Baa1 Rating [Member]
Reinsurance Recoverables [Line Items]
Percentage ceded par	87.77%
Net unsecured reinsurance recoverable
Sompo Japan Insurance Inc [Member] | Stable [Member] | Moody's, A1 Rating [Member]
Reinsurance Recoverables [Line Items]
Percentage ceded par	6.82%
Net unsecured reinsurance recoverable
Assured Guaranty Corporation [Member] | Stable [Member] | Moody's, A3 Rating [Member]
Reinsurance Recoverables [Line Items]
Percentage ceded par	5.41%
Net unsecured reinsurance recoverable	$ 13,370

X

- Definition

Percentage of the cedant's total ceded financial guarantee principal outstanding.

+ References

No definition available.

+ Details

Name:	abk_PercentageOfCededFinancialGuaranteePrincipalOutstanding
Namespace Prefix:	abk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	abk_ReinsuranceRecoverablesLineItems
Namespace Prefix:	abk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents reinsurance recoverables on paid and unpaid losses and deferred ceded premiums, net of ceded premiums payables due to reinsurers, letters of credit, and collateral posted for the benefit of the cedant.

+ References

No definition available.

+ Details

Name:	abk_UnsecuredReinsuranceRecoverables
Namespace Prefix:	abk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant