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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
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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

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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