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Commercial Mortgage Loans - Additional Information (Details) (Commercial mortgage loans [Member], USD $) In Thousands, unless otherwise specified | 1 Months Ended |
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Sep. 30, 2013 acre participation_interest | Mar. 31, 2013
Hotel [Member] | Hotel - Silver Spring, MD [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Fee received on loan transfer |  | $ 280 us-gaap_LoansAndLeasesReceivableDeferredIncome / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_HotelSilverSpringMDMember
Mixed Use [Member] | Mixed Use - South Boston, MA [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Senior sub-participation interests | 2 ari_SeniorSubParticipationInterests / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseSouthBostonMAMember |
Property Size, Area | 20 ari_MortgageLoansonRealEstateAreaofRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseSouthBostonMAMember |
Sub-participation, percentage of par value | 78.00%ari_MortgageLoansonRealEstateSubParticipationInterestAcquiredPercentageofParGross / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseSouthBostonMAMember |
Sub-participation brokerage fee | 3.00%ari_MortgageLoansonRealEstateSubParticipationInterestAcquiredBrokerageFee / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseSouthBostonMAMember |

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- Definition Mortgage Loans on Real Estate, Area of Real Estate Property + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Sub-Participation Brokerage Fee + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | num:percentItemType
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- Definition Mortgage Loans on Real Estate, Sub-Participation Percentage of Par + References No definition available. + Details
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Namespace Prefix: | ari_
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- Definition Senior Sub-Participation Interests + References No definition available. + Details
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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + Details
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- Details
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