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Loans and Investments (Details 7) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014 item
Loans and Investments
Total interest reserves	$ 15.8
Number of loans	53
Aggregate unpaid principal balance	$ 715.9

X

- Definition

Amount of funds placed into an interest reserve, based on contractual requirements, to cover debt service costs.

+ References

No definition available.

+ Details

Name:	abr_FundedInterestReserves
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Represents the number of loans with funded interest reserves.

+ References

No definition available.

+ Details

Name:	abr_FundedInterestReservesNumberOfLoans
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- Definition

Amount of unpaid principal balance of receivables with funded interest reserves.

+ References

No definition available.

+ Details

Name:	abr_FundedInterestReservesUnpaidPrincipalBalance
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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