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Summary of Significant Accounting Policies (Details)	9 Months Ended
	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