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Commercial Mortgage Loan Portfolio (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items] |  |  |
Current Face Amount | $ 1,029,173,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent | [1],[2] |
Commercial mortgage loans [Member] |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Original Face Amount | 467,300,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember |  | 164,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember
Current Face Amount | 465,574,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember |  | 161,600,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember
Carrying Value | 458,520,000 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember |  | 161,099,000 us-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 | 26,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelSilverSpringMDMember |  | 26,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelSilverSpringMDMember
Current Face Amount | 24,590,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelSilverSpringMDMember |  | 24,947,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelSilverSpringMDMember
Carrying Value | 24,557,000 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelSilverSpringMDMember |  | 24,785,000 us-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 | 263 ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelSilverSpringMDMember |  | 263 ari_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 | 34,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelPhiladelphiaPAMember |  |
Current Face Amount | 34,000,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelPhiladelphiaPAMember |  |
Carrying Value | 33,842,000 us-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 | 301 ari_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 |  |  | 32,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelNewYorkNYMember
Current Face Amount |  |  | 31,317,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelNewYorkNYMember
Carrying Value |  |  | 31,317,000 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelNewYorkNYMember
Property Size, Number of Units/Rooms |  |  | 151 ari_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 | 33,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYAugust2013Member |  | 33,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYAugust2013Member
Current Face Amount | 33,846,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYAugust2013Member |  | 33,167,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYAugust2013Member
Carrying Value | 33,961,000 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYAugust2013Member |  | 32,961,000 us-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 | 40,000 ari_MortgageLoansonRealEstateAreaofRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYAugust2013Member |  | 40,000 ari_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 | 67,300,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNYNYNovember2014Member |  |
Current Face Amount | 67,300,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNYNYNovember2014Member |  |
Carrying Value | 64,714,000 us-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 | 86,000 ari_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 |  |  | 45,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYDecember2012Member
Current Face Amount |  |  | 45,000,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYDecember2012Member
Carrying Value |  |  | 44,867,000 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYDecember2012Member
Property Size, Area |  |  | 119,000 ari_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 | 28,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConstructionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConstructionPotomacMDMember |  |
Current Face Amount | 28,000,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConstructionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConstructionPotomacMDMember |  |
Carrying Value | 27,520,000 us-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 | 50 ari_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 | 20,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConstructionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConstructionBethesdaMDMember |  |
Current Face Amount | 20,000,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConstructionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConstructionBethesdaMDMember |  |
Carrying Value | 19,616,000 us-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 | 40 ari_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 | 101,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_VacationHomePortfolioMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_VacationHomePortfolioVariousMember |  |
Current Face Amount | 100,046,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_VacationHomePortfolioMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_VacationHomePortfolioVariousMember |  |
Carrying Value | 99,086,000 us-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 | 229 ari_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 | 50,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_VacationHomePortfolioMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_VacationHomePortfolioVariousUnitedStatesMember |  |
Current Face Amount | 50,000,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_VacationHomePortfolioMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_VacationHomePortfolioVariousUnitedStatesMember |  |
Carrying Value | 49,508,000 us-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 | 24 ari_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 |  |  | 28,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_OfficeCondoMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_OfficeCondoNewYorkNYMember
Current Face Amount |  |  | 27,169,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_OfficeCondoMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_OfficeCondoNewYorkNYMember
Carrying Value |  |  | 27,169,000 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_OfficeCondoMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_OfficeCondoNewYorkNYMember
Property Size, Area |  |  | 73,419 ari_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 | 20,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseCincinnatiOHMember |  |
Current Face Amount | 20,000,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseCincinnatiOHMember |  |
Carrying Value | 18,309,000 us-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 | 65 ari_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 | 30,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MultifamilyConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MultifamilyBrooklynNYMember |  |
Current Face Amount | 30,000,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MultifamilyConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MultifamilyBrooklynNYMember |  |
Carrying Value | 30,110,000 us-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 | 63 ari_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 | 58,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MultifamilyConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MultifamilyWillistonNDMember |  |
Current Face Amount | 57,792,000 ari_MortgageLoansonRealEstateFaceAmountofMortgagesCurrent / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MultifamilyConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MultifamilyWillistonNDMember |  |
Carrying Value | $ 57,297,000 us-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 | 366 ari_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.

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- 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 + Details
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- 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 + Details
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- 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 + Details
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