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Debt Obligations (Details 8) (USD $)	9 Months Ended				3 Months Ended	9 Months Ended		12 Months Ended	3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Real Estate owned Multifamily Portfolio	Dec. 31, 2013 Real Estate owned Multifamily Portfolio	Sep. 30, 2014 First mortgage Multifamily Portfolio	Sep. 30, 2014 First mortgage Multifamily Portfolio	Sep. 30, 2014 Mortgage Notes Payable - Real Estate Owned and Held-For-Sale with maturity date of July 2015 First mortgage	Dec. 31, 2013 Mortgage Notes Payable - Real Estate Owned and Held-For-Sale with maturity date of July 2015 First mortgage	Dec. 31, 2014 Mortgage Notes Payable - Real Estate Owned and Held-For-Sale with maturity date of July 2015 First mortgage Real Estate held for sale item	Sep. 30, 2014 Mortgage Notes Payable - Real Estate Held-For-Sale First mortgage Real Estate held for sale Multifamily Portfolio item	Sep. 30, 2014 Mortgage Notes Payable - Real Estate Owned First mortgage Multifamily Portfolio
Debt Obligations
Mortgage note payable - real estate owned	$ 25,022,701	$ 42,745,650	$ 25,000,000	$ 42,700,000			$ 48,800,000	$ 53,800,000
Reduction in mortgage note payable	4,937,098				1,300,000	1,600,000			11,100,000		3,400,000
Variable interest rate, description							one-month LIBOR
Variable rate, spread (as a percent)							1.23%
Investment classified as real estate held-for-sale								11,000,000
Mortgage note payable - real estate held-for-sale	$ 23,791,205	$ 11,005,354								$ 23,800,000
Number of properties sold									1
Number of real estate properties classified as held-for-sale										3

X

- Definition

Represents the value of investment transferred to real estate held-for-sale in noncash transactions during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the liability for mortgage notes payable by the reporting entity in connection with the acquisition of real property which is held-for-sale.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the liability for mortgage notes payable by the reporting entity in connection with the acquisition of real property.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the number of real estate properties classified as held-for-sale within the portfolio.

+ References

No definition available.

+ Details

Name:	abr_NumberOfRealEstatePropertiesClassifiedAsHeldForSale
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of real estate properties sold within the portfolio.

+ References

No definition available.

+ Details

Name:	abr_NumberOfRealEstatePropertiesSold
Namespace Prefix:	abr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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