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Real Estate - Schedule of real estate owned and related debt, held for sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Real Estate [Abstract] |  |
Real estate owned, held for sale | $ 42,905 | $ 0
Debt related to real estate owned, held for sale | (33,000) | 0
Real Estate Held-for-sale, Net Of Debt Related To Real Estate Owned | $ 9,905 | $ 0

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- Definition Debt Related To Real Estate Owned, Held For Sale + References No definition available. + Details
Name: | ari_DebtRelatedToRealEstateOwnedHeldForSale
Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Real Estate Held-for-sale, Net Of Debt Related To Real Estate Owned + References No definition available. + Details
Name: | ari_RealEstateHeldForSaleNetOfDebtRelatedToRealEstateOwned
Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_RealEstateHeldforsale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant