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Accounts Payable, Accrued Expenses and Other Liabilities - Components of our Accounts Payable, Accrued Expense and Other Liabilities (Parenthetical) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Payables and Accruals [Abstract] |  |
Accounts payable, accrued expenses and other liabilities | $ 10.4 | $ 5.5

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- Definition Accounts Payable, Accrued Liabilities and Other Liabilities Of Real Estate Owned + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration