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Schedule IV - Mortgage Loans on Real Estate (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2012

Mortgage Loans on Real Estate [Line Items]

Face amount of loans

$ 1,029,173ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent

^[1],[2]

Mortgage Loans on Real Estate

1,019,702us-gaap_MortgageLoansOnRealEstate

^[1],[2]

658,583us-gaap_MortgageLoansOnRealEstate

389,167us-gaap_MortgageLoansOnRealEstate

Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

6.84%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

8.82%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

Face amount of loans

465,574ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

161,600ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

Carrying Value

458,520us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

161,099us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

Total commercial mortgage loans

458,520us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

11.34%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember

11.60%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember

Face amount of loans

563,599ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember

^[1]

500,037ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember

Carrying Value

561,182us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember

^[1]

497,484us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember

Hotel - Silver Spring, MD [Member] | Hotel [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

9.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

Face amount of loans

24,590ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

24,947ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

Carrying Value

24,557us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

24,785us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

Condo Conversion - NY, NY August 2013 [Member] | Condo Conversion [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

9.67%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

Face amount of loans

33,846ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

33,167ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

Carrying Value

33,961us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

32,961us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

Condo Construction Potomac, MD [Member] | Condo Construction [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

10.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionPotomacMDMember

Face amount of loans

28,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionPotomacMDMember

Carrying Value

27,520us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionPotomacMDMember

Vacation Home Portfolio - Various [Member] | Vacation Home Portfolio [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

7.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousMember

Face amount of loans

100,046ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousMember

Carrying Value

99,086us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousMember

Condo Construction Bethesda, MD [Member] | Condo Construction [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

10.75%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionBethesdaMDMember

Face amount of loans

20,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionBethesdaMDMember

Carrying Value

19,616us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionBethesdaMDMember

Multifamily, Brooklyn, NY [Member] | Multifamily Conversion [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

4.41%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyBrooklynNYMember

Face amount of loans

30,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyBrooklynNYMember

Carrying Value

30,110us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyBrooklynNYMember

Mixed Use - Cincinnati, OH [Member] | Mixed Use [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

9.25%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseCincinnatiOHMember

Face amount of loans

20,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseCincinnatiOHMember

Carrying Value

18,309us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseCincinnatiOHMember

Condo Conversion - NY, NY November 2014 [Member] | Condo Conversion [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

3.75%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNYNYNovember2014Member

Face amount of loans

67,300ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNYNYNovember2014Member

Carrying Value

64,714us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNYNYNovember2014Member

Multifamily - Williston, ND [Member] | Multifamily Conversion [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

5.15%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyWillistonNDMember

Face amount of loans

57,792ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyWillistonNDMember

Carrying Value

57,297us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyWillistonNDMember

Vacation Home Portfolio - Various, United States [Member] | Vacation Home Portfolio [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

7.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousUnitedStatesMember

Face amount of loans

50,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousUnitedStatesMember

Carrying Value

49,508us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousUnitedStatesMember

Hotel - Philadelphia, PA [Member] | Hotel [Member] | Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

4.71%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPhiladelphiaPAMember

Face amount of loans

34,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPhiladelphiaPAMember

Carrying Value

33,842us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPhiladelphiaPAMember

Mixed Use - Various [Member] | Mixed Use [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

14.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseVariousMember

^[1]

Face amount of loans

19,464ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseVariousMember

^[1]

17,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseVariousMember

Carrying Value

19,294us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseVariousMember

^[1]

16,805us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseVariousMember

Mixed Use - London, England [Member] | Mixed Use [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

9.25%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseLondonEnglandMember

^[1]

Face amount of loans

52,355ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseLondonEnglandMember

^[1]

Carrying Value

52,355us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseLondonEnglandMember

^[1]

Office - Michigan [Member] | Office [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

13.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeMichiganMember

^[1]

Face amount of loans

8,813ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeMichiganMember

^[1]

15,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeMichiganMember

Carrying Value

8,813us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeMichiganMember

^[1]

15,207us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeMichiganMember

Ski Resort - California [Member] | Ski Resort [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

13.25%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_SkiResortMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_SkiResortCaliforniaMember

^[1]

Face amount of loans

40,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_SkiResortMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_SkiResortCaliforniaMember

^[1]

Carrying Value

39,771us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_SkiResortMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_SkiResortCaliforniaMember

^[1]

Mixed Use - North Carolina [Member] | Mixed Use [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

11.10%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseNorthCarolinaMember

^[1]

Face amount of loans

6,525ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseNorthCarolinaMember

^[1]

6,525ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseNorthCarolinaMember

Carrying Value

6,525us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseNorthCarolinaMember

^[1]

6,525us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseNorthCarolinaMember

Office Complex - Missouri [Member] | Office [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

11.75%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeComplexMissouriMember

^[1]

Face amount of loans

9,711ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeComplexMissouriMember

^[1]

9,849ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeComplexMissouriMember

Carrying Value

9,711us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeComplexMissouriMember

^[1]

9,849us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeComplexMissouriMember

Hotel Portfolio - Various [Member] | Hotel [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

11.07%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioVariousMember

^[1]

Face amount of loans

34,042ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioVariousMember

^[1]

48,431ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioVariousMember

Carrying Value

33,995us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioVariousMember

^[1]

48,397us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioVariousMember

Condo Construction - NY, NY [Member] | Condo Construction [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

13.25%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionNewYorkNYMember

^[1]

Face amount of loans

76,344ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionNewYorkNYMember

^[1]

Carrying Value

76,005us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionNewYorkNYMember

^[1]

Multifamily Conversion - NY, NY December 2014 [Member] | Multifamily Conversion [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

10.23%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyConversionDecember2014Member

^[1]

Face amount of loans

14,608ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyConversionDecember2014Member

^[1]

18,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyConversionDecember2014Member

Carrying Value

14,703us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyConversionDecember2014Member

^[1]

17,906us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyConversionDecember2014Member

Hotel Portfolio - Rochester, MN [Member] | Hotel [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

11.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioRochesterMNMember

^[1]

Face amount of loans

24,486ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioRochesterMNMember

^[1]

24,771ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioRochesterMNMember

Carrying Value

24,486us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioRochesterMNMember

^[1]

24,771us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPortfolioRochesterMNMember

Warehouse Portfolio - Various [Member] | Warehouse [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

11.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_WarehousePortfolioVariousMember

^[1]

Face amount of loans

32,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_WarehousePortfolioVariousMember

^[1]

32,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_WarehousePortfolioVariousMember

Carrying Value

32,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_WarehousePortfolioVariousMember

^[1]

32,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_WarehouseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_WarehousePortfolioVariousMember

Multifamily Conversion - NY, NY June 2014 [Member] | Multifamily Conversion [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

12.25%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyConversionJune2014Member

^[1]

Face amount of loans

44,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyConversionJune2014Member

^[1]

Carrying Value

43,989us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyConversionJune2014Member

^[1]

Office Condo - NY, NY [Member] | Office [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

11.25%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

^[1]

Face amount of loans

14,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

^[1]

14,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

Carrying Value

13,596us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

^[1]

13,565us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

Condo Conversion - NY, NY September 2015 [Member] | Condo Conversion [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

9.67%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYSeptember2015Member

^[1]

Face amount of loans

29,751ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYSeptember2015Member

^[1]

295ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYSeptember2015Member

Carrying Value

29,762us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYSeptember2015Member

^[1]

2us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYSeptember2015Member

Mixed Use - Pittsburgh, PA [Member] | Mixed Use [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

9.42%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUsePittsburghPAMember

^[1]

Face amount of loans

22,500ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUsePittsburghPAMember

^[1]

22,500ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUsePittsburghPAMember

Carrying Value

22,473us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUsePittsburghPAMember

^[1]

22,342us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUsePittsburghPAMember

Healthcare Portfolio - Various [Member] | Healthcare [Member] | Subordinate Loans [Member]

Mortgage Loans on Real Estate [Line Items]

Interest Rate

9.43%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_HealthcareMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HealthcarePortfolioVariousMember

^[1]

Face amount of loans

50,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_HealthcareMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HealthcarePortfolioVariousMember

^[1]

47,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_HealthcareMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HealthcarePortfolioVariousMember

Carrying Value

50,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
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[1]	Subject to prior liens.
[2]	The aggregate cost for federal income tax purposes is $1,019,702.

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