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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Current Expected Credit Losses (Details) - USD ($)
$ in Thousands

Dec. 31, 2024

Dec. 31, 2023

Financing Receivable, Allowance for Credit Loss [Line Items]

Allowance reserve

$ 30,836

^[1],[2]

$ 26,482

Unfunded commitments

5,948

4,017

Total General CECL Allowance

36,784

30,499

Commercial Mortgage Portfolio Segment

Financing Receivable, Allowance for Credit Loss [Line Items]

Allowance reserve

30,167

25,723

Subordinate Mortgage Portfolio Segment

Financing Receivable, Allowance for Credit Loss [Line Items]

Allowance reserve

$ 669

$ 759

[1]	Excludes $5.9 million of General CECL Allowance related to unfunded commitments on commercial mortgage loans, subordinate loans and other lending assets, net in 2024.
[2]	Excludes Note receivable, held for sale with an outstanding principal and carrying value of $41.2 million.

X

- Definition

Allowance For Loan And Lease Losses Real Estate Liability Current Expected Credit Loss

+ References

No definition available.

+ Details

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

X

- Definition

Unfunded commitments liability.

+ References

No definition available.

+ Details

Name:	ari_UnfundedCommitmentsLiability
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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