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Secured Debt Arrangements, Net - Schedule of Assets and Liabilities (Parenthetical) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Allowance reserve	$ 34,192	$ 26,482
Commercial Mortgage Portfolio Segment
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Allowance reserve	33,355	25,723
VIE
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Deferred financing costs	1,300	2,000
VIE | Commercial Mortgage Portfolio Segment
Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Allowance reserve	12,700	8,300
General CECL allowance on unfunded commitments	$ 2,400	$ 2,500

X

- Definition

Allowance of unfunded commitment.

+ References

No definition available.

+ Details

Name:	ari_AllowanceOfUnfundedCommitment
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

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

X

- Definition

Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479359/835-30-S45-1

+ Details

Name:	us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-3

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ari_CommercialMortgagePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: