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Summary of Significant Accounting Policies (Details) | 9 Months Ended
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Sep. 30, 2014 item
Summary of Significant Accounting Policies |
Number of collateralized debt obligation subsidiaries | 3
Number of collateralized loan obligation subsidiaries | 3

X
- Definition Represents the number of collateralized debt obligation subsidiaries in which the entity is a primary beneficiary. + References No definition available. + Details
Name: | abr_CollateralizedDebtObligationSubsidiariesNumber
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of collateralized loan obligation subsidiaries in which the entity is a primary beneficiary. + References No definition available. + Details
Name: | abr_CollateralizedLoanObligationSubsidiariesNumber
Namespace Prefix: | abr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration