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Debt Securities - Percentage Vintage, Property Type, and Location of Collateral Securing Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 100.00%us-gaap_ConcentrationRiskPercentage1 100.00%us-gaap_ConcentrationRiskPercentage1
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2005 [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ari_VintageConcentrationRiskMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ari_Vintage2005Member		 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ari_VintageConcentrationRiskMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ari_Vintage2005Member
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2006 [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ari_VintageConcentrationRiskMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ari_Vintage2006Member		 3.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ari_VintageConcentrationRiskMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ari_Vintage2006Member
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2007 [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 63.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ari_VintageConcentrationRiskMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ari_Vintage2007Member		 97.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ari_VintageConcentrationRiskMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ari_Vintage2007Member
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2008 [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ari_VintageConcentrationRiskMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ari_Vintage2008Member		 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= ari_VintageConcentrationRiskMember
/ us-gaap_InvestmentSecondaryCategorizationAxis
= ari_Vintage2008Member
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Office [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 33.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember		 33.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OfficeBuildingMember
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Retail [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 29.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember		 25.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_RetailSiteMember
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Multifamily [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 13.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultiFamilyAndCommercialMember		 15.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= ari_MultiFamilyAndCommercialMember
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Hotel [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 9.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember		 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Other [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember		 14.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_ProductConcentrationRiskMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | South Atlantic [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 23.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= ari_SouthAtlanticMember		 23.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= ari_SouthAtlanticMember
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Middle Atlantic [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 21.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= ari_MiddleAtlanticMember		 22.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= ari_MiddleAtlanticMember
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Pacific [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= ari_PacificMember		 17.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= ari_PacificMember
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | East North Central [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= ari_EastNorthCentralMember		 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= ari_EastNorthCentralMember
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Other [Member]    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 27.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_CorporateAndOtherMember		 36.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_CorporateAndOtherMember