Represents related to the Company number of defendants related to the entity.

No definition available.

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Namespace Prefix:	abr_
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Balance Type:	na
Period Type:	duration

- Definition

Represents the number of lawsuits consolidated.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the aggregate amount which the Trust would be seeking from the affiliates of the entity If the amended complaint is filed.

+ References

No definition available.

+ Details

Name:	abr_LossContingencySeekingOfAmountsFromAffiliatesOfEntity
Namespace Prefix:	abr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(6))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
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+ Details

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Period Type:	duration

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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- Details

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Namespace Prefix:
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- Details

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Commitments and Contingencies - Litigation (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2022 USD ($)	Jun. 30, 2013 defendant lawsuit	Jun. 30, 2011 lawsuit	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Commitments and Contingencies
Litigation settlement \| $				$ 0	$ 0	$ 7,350
Lawsuits filed by Extended Stay Litigation Trust (the Trust)
Commitments and Contingencies
Number of lawsuits or complaints filed \| lawsuit			3
Lawsuits filed by Extended Stay Litigation Trust (the Trust) \| Motion to Amend Lawsuits
Commitments and Contingencies
Number of lawsuits consolidated \| lawsuit		1
Number of defendants related to the entity \| defendant		0
Aggregate amount which the Trust would be seeking from the affiliates of the entity \| $	$ 38,000