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Commercial Mortgage Loan Portfolio (Details) (USD $)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Mortgage Loans on Real Estate [Line Items]

Current Face Amount

$ 1,029,173,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent

^[1],[2]

Commercial mortgage loans [Member]

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

467,300,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

164,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

Current Face Amount

465,574,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

161,600,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

Carrying Value

458,520,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

161,099,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

Coupon rate of loan

6.84%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

8.82%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

26,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

26,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

Current Face Amount

24,590,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

24,947,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

Carrying Value

24,557,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

24,785,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

Coupon rate of loan

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

Property Size, Number of Units/Rooms

263ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

263ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelSilverSpringMDMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

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

Current Face Amount

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

Carrying Value

33,842,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPhiladelphiaPAMember

Coupon rate of loan

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

Property Size, Number of Units/Rooms

301ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelPhiladelphiaPAMember

Commercial mortgage loans [Member] | Hotel [Member] | Hotel - NY, NY [Member]

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

32,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelNewYorkNYMember

Current Face Amount

31,317,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelNewYorkNYMember

Carrying Value

31,317,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelNewYorkNYMember

Property Size, Number of Units/Rooms

151ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelNewYorkNYMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

33,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

33,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

Current Face Amount

33,846,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

33,167,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

Carrying Value

33,961,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

32,961,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

Coupon rate of loan

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

Property Size, Area

40,000ari_MortgageLoansonRealEstateAreaofRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

40,000ari_MortgageLoansonRealEstateAreaofRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYAugust2013Member

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

67,300,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNYNYNovember2014Member

Current Face Amount

67,300,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNYNYNovember2014Member

Carrying Value

64,714,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNYNYNovember2014Member

Coupon rate of loan

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

Property Size, Area

86,000ari_MortgageLoansonRealEstateAreaofRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNYNYNovember2014Member

Commercial mortgage loans [Member] | Condo Conversion [Member] | Condo Conversion - NY, NY December 2012 [Member]

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

45,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYDecember2012Member

Current Face Amount

45,000,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYDecember2012Member

Carrying Value

44,867,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYDecember2012Member

Property Size, Area

119,000ari_MortgageLoansonRealEstateAreaofRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConversionNewYorkNYDecember2012Member

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

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

Current Face Amount

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

Carrying Value

27,520,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionPotomacMDMember

Coupon rate of loan

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

Property Size, Number of Units/Rooms

50ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionPotomacMDMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

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

Current Face Amount

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

Carrying Value

19,616,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionBethesdaMDMember

Coupon rate of loan

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

Property Size, Number of Units/Rooms

40ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_CondoConstructionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_CondoConstructionBethesdaMDMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

101,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousMember

Current Face Amount

100,046,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousMember

Carrying Value

99,086,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousMember

Coupon rate of loan

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

Number of properties

229ari_MortgageLoansonRealEstateNumberofPropertiesinaPortfolio
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

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

Current Face Amount

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

Carrying Value

49,508,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousUnitedStatesMember

Coupon rate of loan

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

Number of properties

24ari_MortgageLoansonRealEstateNumberofPropertiesinaPortfolio
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_VacationHomePortfolioMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_VacationHomePortfolioVariousUnitedStatesMember

Commercial mortgage loans [Member] | Office Condo [Member] | Office Condo (Headquarters) - NY, NY [Member]

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

28,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeCondoMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

Current Face Amount

27,169,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeCondoMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

Carrying Value

27,169,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeCondoMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

Property Size, Area

73,419ari_MortgageLoansonRealEstateAreaofRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_OfficeCondoMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_OfficeCondoNewYorkNYMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

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

Current Face Amount

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

Carrying Value

18,309,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseCincinnatiOHMember

Coupon rate of loan

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

Property Size, Area

65ari_MortgageLoansonRealEstateAreaofRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MixedUseCincinnatiOHMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

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

Current Face Amount

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

Carrying Value

30,110,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyBrooklynNYMember

Coupon rate of loan

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

Property Size, Number of Units/Rooms

63ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyBrooklynNYMember

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

Mortgage Loans on Real Estate [Line Items]

Original Face Amount

58,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyWillistonNDMember

Current Face Amount

57,792,000ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyWillistonNDMember

Carrying Value

$ 57,297,000us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyWillistonNDMember

Coupon rate of loan

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

Property Size, Number of Units/Rooms

366ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultifamilyConversionMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyWillistonNDMember

[1]	Subject to prior liens.
[2]	The aggregate cost for federal income tax purposes is $1,019,702.

X

- Definition

Mortgage Loans on Real Estate, Area of Real Estate Property

+ References

No definition available.

+ Details

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X

- Definition

Loans held for investment current face amount.

+ References

No definition available.

+ Details

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X

- Definition

Mortgage Loans on Real Estate, Number of Properties in a Portfolio

+ References

No definition available.

+ Details

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Namespace Prefix:	ari_
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X

- Definition

Mortgage Loans on Real Estate, Number of Units in Real Estate Property

+ References

No definition available.

+ Details

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Namespace Prefix:	ari_
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Balance Type:	na
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X

- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph c

-Article 7

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X

- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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X

- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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