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Fair Value Disclosure (Details) - USD ($) $ in Millions	Jun. 29, 2021	May 24, 2021	Dec. 31, 2017
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

X

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

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- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ari_HotelWashingtonD.C.Member
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: