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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
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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

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- Definition Available-for-sale Debt Securities, Weighted Average Discount Rate + References No definition available. + Details
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- Definition Available-for-sale Debt Securities, Weighted Average Expected Term + References No definition available. + Details
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- Definition Available-for-sale Debt Securities, Weighted Average Interest Rate + References No definition available. + Details
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- Details
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