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Repurchase Agreement - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Jan. 31, 2013
Dec. 31, 2011
Securities
Dec. 31, 2014
extension
Dec. 31, 2013
Line of Credit Facility [Line Items]        
Line of credit, amount outstanding     622,194us-gaap_LineOfCredit $ 202,033us-gaap_LineOfCredit
CDO Bond [Member]        
Line of Credit Facility [Line Items]        
Investment, Face Amount   68,726ari_InvestmentFaceAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedDebtObligationsMember
   
Advance rate on face amount   69.00%ari_InvestmentAdvanceRate
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedDebtObligationsMember
   
Number of senior and subordinate commercial real estate debt positions and commercial real estate securities included in CDO   58ari_NumberofDebtPositionsinAssetPool
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedDebtObligationsMember
   
Internal rate of return 17.00%ari_InvestmentInternalRateofReturn
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedDebtObligationsMember
     
Repurchase Facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit, amount outstanding   $ 47,439us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= ari_RepurchaseFacilityMember
   
Interest rate for repurchase facility     13.00%ari_LineofCreditFacilityInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= ari_RepurchaseFacilityMember
 
Current pay interest rate     10.00%ari_LineofCreditFacilityInterestRateCurrentRate
/ us-gaap_CreditFacilityAxis
= ari_RepurchaseFacilityMember
 
Accrual interest rate     3.00%ari_LineofCreditFacilityInterestRateAccrualRate
/ us-gaap_CreditFacilityAxis
= ari_RepurchaseFacilityMember
 
Expiration period     18 months  
Number of extensions     3ari_LineofCreditNumberofExtensions
/ us-gaap_CreditFacilityAxis
= ari_RepurchaseFacilityMember
 
Option to extend, term     6 months