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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014
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Contractual Obligations, Payments Due by Period |
2014 | $ 136.8
2015 | 308.3
2016 | 290.2
2017 | 301.1
2018 | 2.5
Thereafter | 273.7
Unfunded commitments related to loans and investments | 6.2
Available amount to fund unfunded commitments | $ 6.2

X
- Definition Represents the amount of restricted cash balance and CDO III revolver capacity available to fund the portion of the unfunded commitments for loans financed by the entity's CDO vehicles. + References No definition available. + Details
Name: | abr_AvailableAmountToFundUnfundedCommitments
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of outstanding unfunded commitments related to loans and investments that the entity is obligated to fund as the borrowers meet certain requirements. + References No definition available. + Details
Name: | abr_LoansAndInvestmentsUnfundedCommitments
Namespace Prefix: | abr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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