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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Allocation of Carrying Value of Loan Portfolio Based on Internal Risk Ratings (Parenthetical) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Receivables [Abstract] |  |  |
General allowance for credit loss liability on unfunded | $ 5.9 | $ 4.0 | $ 4.3

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- Definition General allowance for credit loss liability on unfunded + References No definition available. + Details
Name: | ari_GeneralAllowanceForCreditLossLiabilityOnUnfunded
Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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