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Commercial Mortgage Loans - Additional Information (Details) (Commercial mortgage loans [Member], USD $) In Thousands, unless otherwise specified	1 Months Ended
	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		$ 280us-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	2ari_SeniorSubParticipationInterests / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseSouthBostonMAMember
Property Size, Area	20ari_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

X

- Definition

Mortgage Loans on Real Estate, Area of Real Estate Property

+ References

No definition available.

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X

- Definition

Mortgage Loans on Real Estate, Sub-Participation Brokerage Fee

+ References

No definition available.

+ Details

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X

- 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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X

- Definition

Senior Sub-Participation Interests

+ References

No definition available.

+ Details

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X

- 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

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