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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
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

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, 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

X

- References

No definition available.

+ Details

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

X

- 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