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Real Estate Owned and Related Debt, Held for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt related to real estate owned, held for sale | $ 33,000 | $ 33,000
Real estate held-for-sale, impairment | 550 | $ 0
Hotel - Anaheim, CA | Subordinate Mortgage Portfolio Segment |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt related to real estate owned, held for sale | $ 33,000 |

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- Definition Debt Related To Real Estate Owned, Held For Sale + 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 Real Estate Held-For-Sale, Impairment + 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=ari_SubordinateMortgagePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |