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Subsequent Events - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 0 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Sep. 30, 2014
One-month London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2014
Line of Credit [Member]
JP Morgan Chase [Member]
One-month London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2014
Commercial mortgage loans [Member]
USD ($)
Dec. 31, 2013
Commercial mortgage loans [Member]
USD ($)
Feb. 25, 2015
Subsequent Event [Member]
USD ($)
Feb. 26, 2015
Subsequent Event [Member]
Commercial mortgage loans [Member]
USD ($)
Jan. 31, 2015
Subsequent Event [Member]
Commercial mortgage loans [Member]
GBP (£)
Jan. 31, 2015
Subsequent Event [Member]
Commercial mortgage loans [Member]
Senior Housing Facility [Member]
Feb. 26, 2015
Subsequent Event [Member]
Commercial mortgage loans [Member]
Residential Condominium [Member]
Luxury Residential Condominium - Montgomery County, MD [Member]
unit
Jan. 26, 2015
Goldman Facility [Member]
Subsequent Event [Member]
Line of Credit [Member]
Goldman Sachs [Member]
Jan. 26, 2015
Goldman Facility [Member]
Subsequent Event [Member]
Line of Credit [Member]
Goldman Sachs [Member]
USD ($)
Jan. 29, 2015
Amended and Restated JPMorgan Facility [Member]
Subsequent Event [Member]
Line of Credit [Member]
JP Morgan Chase [Member]
USD ($)
Jan. 29, 2015
Amended and Restated JPMorgan Facility [Member]
Subsequent Event [Member]
Line of Credit [Member]
JP Morgan Chase [Member]
USD ($)
Jan. 31, 2015
Mezzanine Loan [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
GBP (£)
Jan. 31, 2015
Mezzanine Loan [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
Senior Housing Facility [Member]
USD ($)
Jan. 31, 2015
Mezzanine Loan [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
Senior Housing Facility [Member]
GBP (£)
Feb. 26, 2015
Mezzanine Loan [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
Hotel [Member]
USD ($)
Room
Feb. 26, 2015
Mezzanine Loan [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
Mixed Use [Member]
USD ($)
Jan. 31, 2015
Mezzanine Loan, Acquired by Investment Funds [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
GBP (£)
Feb. 26, 2015
First Mortgage [Member]
Subsequent Event [Member]
Mixed Use [Member]
Multifamily and Retail Development - Brooklyn, New York [Member]
USD ($)
sqft
Feb. 26, 2015
First Mortgage [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
USD ($)
Jan. 31, 2015
First Mortgage [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
GBP (£)
Feb. 26, 2015
First Mortgage [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
Residential Condominium [Member]
Luxury Residential Condominium - Montgomery County, MD [Member]
USD ($)
Feb. 26, 2015
Champ LP [Member]
Subsequent Event [Member]
USD ($)
Feb. 26, 2015
Additional Investment [Member]
Champ LP [Member]
Subsequent Event [Member]
USD ($)
Feb. 26, 2015
Additional Investment [Member]
Champ LP [Member]
Subsequent Event [Member]
GBP (£)
Feb. 26, 2015
Unfunded Commitment, Champ L.P. [Member]
Subsequent Event [Member]
EUR (€)
Jan. 29, 2015
Minimum [Member]
Amended and Restated JPMorgan Facility [Member]
Subsequent Event [Member]
Line of Credit [Member]
JP Morgan Chase [Member]
Jan. 29, 2015
Minimum [Member]
Amended and Restated JPMorgan Facility [Member]
Subsequent Event [Member]
Line of Credit [Member]
JP Morgan Chase [Member]
One-month London Interbank Offered Rate (LIBOR) [Member]
Jan. 29, 2015
Maximum [Member]
Amended and Restated JPMorgan Facility [Member]
Subsequent Event [Member]
Line of Credit [Member]
JP Morgan Chase [Member]
Jan. 29, 2015
Maximum [Member]
Amended and Restated JPMorgan Facility [Member]
Subsequent Event [Member]
Line of Credit [Member]
JP Morgan Chase [Member]
One-month London Interbank Offered Rate (LIBOR) [Member]
Jan. 31, 2015
United Kingdom
Mezzanine Loan [Member]
Subsequent Event [Member]
Commercial mortgage loans [Member]
Senior Housing Facility [Member]
facility
Feb. 26, 2015
BKB Bank [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]                                                                                  
Loan amount                     $ 467,300,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember		 $ 164,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember		   $ 90,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 £ 223,800,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		             £ 59,700,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 $ 52,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_SeniorHousingFacilityMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 £ 35,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_SeniorHousingFacilityMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 $ 20,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 $ 82,500,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 £ 24,700,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanAcquiredbyInvestmentFundsMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 $ 92,500,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyandRetailDevelopmentBrooklynNewYorkMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 $ 70,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 £ 164,100,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                      
Proceeds from Sale of Equity Method Investments                                                               20,794,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ invest_InvestmentAxis
= ari_ChampLPMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                  
Number of properties                                                                               44ari_MortgageLoansonRealEstateNumberofPropertiesinaPortfolio
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_SeniorHousingFacilityMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_StatementGeographicalAxis
= country_GB
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Number of units/rooms in property                                 50us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_ResidentialCondominiumMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_LuxuryResidentialCondominiumMontgomeryCountyMDMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		               488us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                
Mortgage loan period                               5 years                 5 years     2 years                          
Appraised loan to value ratio                                           70.00%ari_MortgageLoansonRealEstateLoantoValueRatio
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		     74.00%ari_MortgageLoansonRealEstateLoantoValueRatio
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		     57.00%ari_MortgageLoansonRealEstateLoantoValueRatio
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyandRetailDevelopmentBrooklynNewYorkMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                          
Internal rate of return                                           10.00%ari_MortgageLoansonRealEstateInternalRateofReturn
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		     11.00%ari_MortgageLoansonRealEstateInternalRateofReturn
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		     21.00%ari_MortgageLoansonRealEstateInternalRateofReturn
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyandRetailDevelopmentBrooklynNewYorkMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                          
Additional investment                                                                 3,929,000us-gaap_OtherCommitment
/ invest_InvestmentAxis
= ari_ChampLPMember
/ us-gaap_OtherCommitmentsAxis
= ari_AdditionalInvestmentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 3,331,000us-gaap_OtherCommitment
/ invest_InvestmentAxis
= ari_ChampLPMember
/ us-gaap_OtherCommitmentsAxis
= ari_AdditionalInvestmentMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		 3,229,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= ari_UnfundedCommitmentChampL.P.Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		            
Additional amount funded                                                   4,194,000ari_MortgageLoansonRealEstateFundedAmountofMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ari_MezzanineLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		   72,500,000ari_MortgageLoansonRealEstateFundedAmountofMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyandRetailDevelopmentBrooklynNewYorkMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		     3,000,000ari_MortgageLoansonRealEstateFundedAmountofMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_ResidentialCondominiumMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ari_CommercialMortgageLoansMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_LuxuryResidentialCondominiumMontgomeryCountyMDMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                    
Property Size, Area                                                       330,000ari_MortgageLoansonRealEstateAreaofRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MixedUseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= ari_MultifamilyandRetailDevelopmentBrooklynNewYorkMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                          
Sale of equity method investment, percentage                                                               48.00%ari_EquityMethodInvestmentSaleofOwnershipPercentage
/ invest_InvestmentAxis
= ari_ChampLPMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                  
Indirect ownership interest from limited partnership                                                                                 11.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ari_BKBBankMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Company and affiliated investors ownership, percentage                                                                                 100.00%ari_OwnershipPercentagebyParentandRelatedParties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ari_BKBBankMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Maximum borrowing under facility                                     52,524,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_GoldmanFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_GoldmanSachsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		   300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                        
Term of debt instrument                                       2 years                                          
Basis spread on interest rate                 4.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		               3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_GoldmanFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_GoldmanSachsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                     2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		   4.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
Extension option                                       1 year                                          
Estimated fair value of collateral pledged, percentage                                                                       25.00%ari_LineofCreditFacilityEstimatedFairValueofCollateralPledgedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		   80.00%ari_LineofCreditFacilityEstimatedFairValueofCollateralPledgedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Threshold amount for margin calls                                       250,000ari_LineofCreditFacilityThresholdAmountforMarginCalls
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                          
Covenant terms, minimum consolidated tangible net worth                                     750,000,000ari_LineofCreditFacilityCovenantTermsMinimumConsolidatedTangibleNetWorthCovenantAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_GoldmanFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_GoldmanSachsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		   750,000,000ari_LineofCreditFacilityCovenantTermsMinimumConsolidatedTangibleNetWorthCovenantAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                        
Covenant terms, minimum consolidated tangible net worth, additional percentage of net cash proceeds                                       75.00%ari_LineofCreditFacilityCovenantTermsMinimumConsolidatedTangibleNetWorthCovenantPercentageofAdditionalNetCashProceeds
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                          
Covenant terms, maximum debt to tangible net worth ratio                                   3ari_LineofCreditCovenantMaximumDebttoTangibleNetWorthRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_GoldmanFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_GoldmanSachsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		   3ari_LineofCreditCovenantMaximumDebttoTangibleNetWorthRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                          
Covenant terms, minimum liquidity                                     15,000,000ari_LineofCreditCovenantMinimumLiquidity
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_GoldmanFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_GoldmanSachsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                            
Covenant terms, total recourse indebtedness, percent                                     5.00%ari_LineofCreditFacilityCovenantTermsTotalRecourseIndebtednessPercent
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_GoldmanFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_GoldmanSachsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                            
Covenant terms, minimum EBITDA to interest expense ratio                                   1.5ari_LineofCreditCovenantMinimumEBITDAtoInterestExpenseRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_GoldmanFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_GoldmanSachsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                              
Covenant terms, minimum liquidity percentage                                       5.00%ari_LineofCreditCovenantMinimumLiquidityPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                          
Covenant terms, consolidated recourse indebtedness                                         $ 15,000,000ari_LineofCreditCovenantConsolidatedRecourseIndebtedness
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ari_AmendedandRestatedJPMorganFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= ari_JPMorganChaseMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		                                        
Dividend declared per share of common stock $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 0.40us-gaap_CommonStockDividendsPerShareDeclared         $ 0.44us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember