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Debt Securities - Additional Information (Details) (USD $)
1 Months Ended 12 Months Ended
May 31, 2014
room
Dec. 31, 2014
option
Dec. 31, 2013
Aug. 31, 2014
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities, face amount   544,190,000ari_AvailableforsaleDebtSecuritiesFaceAmount $ 188,643,000ari_AvailableforsaleDebtSecuritiesFaceAmount    
Commercial Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities, face amount   17,013,000ari_AvailableforsaleDebtSecuritiesFaceAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
33,066,000ari_AvailableforsaleDebtSecuritiesFaceAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
   
Commercial Mortgage Backed Securities [Member] | CMBS - UBS [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities, face amount   387,100,000ari_AvailableforsaleDebtSecuritiesFaceAmount
/ invest_InvestmentHoldingAxis
= ari_CMBSUBSMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
     
Aggregate purchase price of CMBS   375,006,000us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
/ invest_InvestmentHoldingAxis
= ari_CMBSUBSMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
     
Subordinate Loans [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Original Face Amount   562,434,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
495,319,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
   
Subordinate Loans [Member] | Hotel [Member] | Hotel - Aruba [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Property Size, Number of Units/Rooms 442ari_MortgageLoansonRealEstateNumberofUnitsinRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember
       
Property Size, Area 131,500ari_MortgageLoansonRealEstateAreaofRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember
       
Term of loan   3 years      
Number of options to extend loan agreement   2ari_NumberofOptionstoExtendLoanAgreement
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember
     
Option to extend loan agreement, term   1 year      
Appraised loan to value ratio   60.00%ari_MortgageLoansonRealEstateLoantoValueRatio
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember
     
Subordinate Loans [Member] | Hotel [Member] | Hotel - Aruba [Member] | First Mortgage [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Original Face Amount 155,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember
       
Senior Participation [Member] | Subordinate Loans [Member] | Hotel [Member] | Hotel - Aruba [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Participating mortgage loans, amount       90,000,000us-gaap_ParticipatingMortgageLoansMortgageObligationsAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_ParticipatingMortgageLoansAxis
= ari_SeniorParticipationMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember
90,000,000us-gaap_ParticipatingMortgageLoansMortgageObligationsAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_ParticipatingMortgageLoansAxis
= ari_SeniorParticipationMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember
Junior Participation [Member] | Subordinate Loans [Member] | Hotel [Member] | Hotel - Aruba [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Participating mortgage loans, amount       $ 65,000,000us-gaap_ParticipatingMortgageLoansMortgageObligationsAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_ParticipatingMortgageLoansAxis
= ari_JuniorParticipationMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember
$ 65,000,000us-gaap_ParticipatingMortgageLoansMortgageObligationsAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_SubordinateMortgageLoansMember
/ us-gaap_ParticipatingMortgageLoansAxis
= ari_JuniorParticipationMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_HotelArubaMember