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Commitments and Contingencies - Additional Information (Details)
In Thousands, unless otherwise specified
12 Months Ended 9 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Sep. 30, 2014
KBCD Partnership [Member]
USD ($)
Sep. 30, 2014
KBCD Partnership [Member]
EUR (€)
Sep. 30, 2013
KBCD Partnership [Member]
Sep. 30, 2013
Commitment to Invest in KBCD [Member]
USD ($)
Sep. 30, 2013
Commitment to Invest in KBCD [Member]
EUR (€)
Schedule of Equity Method Investments [Line Items]                
Commitment to invest             $ 50,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= ari_CommitmenttoInvestinKBCDMember
€ 38,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= ari_CommitmenttoInvestinKBCDMember
Indirect ownership interest from limited partnership       21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ari_KBCDPartnershipMember
21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ari_KBCDPartnershipMember
21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ari_KBCDPartnershipMember
   
Initial funding for equity method investment $ 39,477us-gaap_PaymentsToAcquireEquityMethodInvestments $ 0us-gaap_PaymentsToAcquireEquityMethodInvestments $ 0us-gaap_PaymentsToAcquireEquityMethodInvestments $ 39,477us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ari_KBCDPartnershipMember
€ 30,724us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ari_KBCDPartnershipMember