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Variable Interest Entities (Details) (USD $)									9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Non-performing loans	Dec. 31, 2013 Non-performing loans	Sep. 30, 2014 Unconsolidated VIEs item	Sep. 30, 2014 Unconsolidated VIEs Non-performing loans	Sep. 30, 2014 Unconsolidated VIEs Maximum	Sep. 30, 2014 Loans	Sep. 30, 2014 Loans Maximum	Sep. 30, 2014 Loans and equity investments	Sep. 30, 2014 Loans and equity investments Maximum	Sep. 30, 2014 CMBS	Sep. 30, 2014 CMBS Maximum	Sep. 30, 2014 Junior subordinated notes	Sep. 30, 2014 Junior subordinated notes Maximum
Variable Interest Entities
Number of VIEs where the reporting entity is not VIE's primary beneficiary									24
Carrying Amount									$ 509,937,751			$ 420,378,972		$ 86,880,779		$ 2,100,000		$ 578,000
Exposure to loss											509,937,751		420,378,972		86,880,779		2,100,000		578,000
Exposure to real estate debt									2,200,000,000
Loans to VIEs	1,655,918,364		1,660,195,301				6,300,000	10,700,000	184,100,000	40,300,000
Loan loss reserves related to VIEs	$ 116,386,526	$ 115,059,988	$ 122,277,411	$ 143,018,491	$ 146,563,765	$ 161,706,313			$ 109,900,000

X

- Definition

Represents the exposure to loss on investments that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of variable interest entities (VIEs) in which the entity is not a primary beneficiary.

+ References

No definition available.

+ Details

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X

- Definition

Carrying amount of the total liabilities that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

+ References

No definition available.

+ Details

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

X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

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Balance Type:	credit
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X

- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Details

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685

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Balance Type:	debit
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