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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Activity Relating to Loan Portfolio (Parenthetical) (Details) $ in Millions | Jun. 30, 2024 USD ($)
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Receivables [Abstract] |
Credit loss allowance liability on unfunded commitments | $ 3.6

X
- Definition Credit loss allowance liability on unfunded commitments. + References No definition available. + Details
Name: | ari_CreditLossAllowanceLiabilityOnUnfundedCommitments
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