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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Overall Statistics for Loan Portfolio (Parenthetical) (Details) | Sep. 30, 2024 | Dec. 31, 2023
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Receivables [Abstract] |  |
Interest rate used in calculating weighted-average cash coupon for non-accrual or cost recovery loans | 0.00% | 0.00%

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- Definition Financing Receivable, Nonaccrual Or Cost Recovery Loans, Weighted Average Interest Rate + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration