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Losses and Loss Expense Reserve (Details 3) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 Sample | Dec. 31, 2011 Sample
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Summary of balance of subrogation recoveries and the related claim liabilities, by estimation approach |  |
Number of samples | 45 | 46
Gross Claim Liabilities Before Subrogation Recoveries | $ 4,171,938 | $ 3,777,581
Subrogation recoveries | (2,770,191) | (2,720,266)
Gross Claim Liabilities After Subrogation Recoveries | 1,401,747 | 1,057,315
Adverse Samples [Member] |  |
Summary of balance of subrogation recoveries and the related claim liabilities, by estimation approach |  |
Number of samples | 29 | 30
Gross Claim Liabilities Before Subrogation Recoveries | 2,853,854 | 2,637,479
Subrogation recoveries | (1,553,195) | (1,457,472)
Gross Claim Liabilities After Subrogation Recoveries | 1,300,659 | 1,180,006
Random Samples [Member] |  |
Summary of balance of subrogation recoveries and the related claim liabilities, by estimation approach |  |
Number of samples | 16 | 16
Gross Claim Liabilities Before Subrogation Recoveries | 1,318,084 | 1,140,102
Subrogation recoveries | (1,216,996) | (1,262,794)
Gross Claim Liabilities After Subrogation Recoveries | $ 101,088 | $ (122,691)

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- Definition Number of samples. + References No definition available. + Details
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Namespace Prefix: | abk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | abk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the related gross claim liability net of subrogation recoveries for RMBS financial guarantee insurance contracts with credit deterioration that have estimated subrogation recoveries. + References No definition available. + Details
Name: | abk_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossClaimLiabilitiesAfterSubrogationRecoveries
Namespace Prefix: | abk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the related gross claim liability for RMBS financial guarantee insurance contracts with credit deterioration that have estimated subrogation recoveries. + References No definition available. + Details
Name: | abk_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossClaimLiabilitiesBeforeSubrogationRecoveries
Namespace Prefix: | abk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element represents the reduction to gross claim liability for subrogation on insured RMBS financial obligations with credit deterioration. + References No definition available. + Details
Name: | abk_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilitySubrogation
Namespace Prefix: | abk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant