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v3.25.1

Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Activity Relating to Loan Portfolio (Parenthetical) (Details) $ in Millions | Mar. 31, 2025 USD ($)
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
Credit loss allowance liability on unfunded commitments | $ 6.1

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- Definition Credit loss allowance liability on unfunded commitments. + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration