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Debt Securities - Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Details) (Commercial Mortgage Backed Securities [Member], AAA-CCC Rated CMBS [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Commercial Mortgage Backed Securities [Member] | AAA-CCC Rated CMBS [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Coupon 5.90%ari_AvailableforsaleDebtSecuritiesWeightedAverageDiscountRate
/ invest_InvestmentHoldingAxis
= ari_AAACCCRatedCMBSMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 5.80%ari_AvailableforsaleDebtSecuritiesWeightedAverageDiscountRate
/ invest_InvestmentHoldingAxis
= ari_AAACCCRatedCMBSMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Yield 6.40%ari_AvailableforsaleDebtSecuritiesWeightedAverageInterestRate
/ invest_InvestmentHoldingAxis
= ari_AAACCCRatedCMBSMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 5.30%ari_AvailableforsaleDebtSecuritiesWeightedAverageInterestRate
/ invest_InvestmentHoldingAxis
= ari_AAACCCRatedCMBSMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Weighted Average Life 2 years 3 months 18 days 3 years 1 month 6 days