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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

X

- 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

X

- Definition

Real Estate Held-For-Sale, Impairment

+ References

No definition available.

+ Details

Name:	ari_RealEstateHeldForSaleImpairment
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ari_HotelAnaheimCAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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