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Fair Value Disclosure (Details) - USD ($) $ in Millions | Jun. 29, 2021 | May 24, 2021 | Dec. 31, 2017
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Hotel - Washington D.C. | Subordinate Mortgage Portfolio Segment |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Debt related to real estate owned, held for investment | $ 110.0 | $ 110.0 | $ 110.0

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- Definition Debt Related To Real Estate Owned, Held For Investment + 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 No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |