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Subordinate Loan Portfolio (Details 2) (Subordinate Loans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]
Unfunded Loan Commitments	32,500us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Hotel, Condo Construction, Multifamily Conversion, and Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year	1 year
Condo Conversion and Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Number of options to extend loan agreement		2ari_NumberofOptionstoExtendLoanAgreement / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionandMixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_SubordinateMortgageLoansMember
Healthcare Portfolio and Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Number of options to extend loan agreement	3ari_NumberofOptionstoExtendLoanAgreement / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_HealthcarePortfolioandHotelMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_SubordinateMortgageLoansMember
Multifamily Conversion - NY, NY June 2014 [Member] | Multifamily Conversion [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	3 months	3 months
Mixed Use - New York, NY [Member] | Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Number of options to extend loan agreement	2ari_NumberofOptionstoExtendLoanAgreement / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_SubordinateMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseNewYorkNYMember
Unfunded Loan Commitments	32,500us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_MixedUseMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_SubordinateMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_MixedUseNewYorkNYMember
Condo Conversion - NY, NY September 2015 [Member] | Condo Conversion [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Unfunded Loan Commitments		29,106us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = ari_CondoConversionMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_SubordinateMortgageLoansMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = ari_CondoConversionNewYorkNYSeptember2015Member

X

- Definition

Mortgage Loans, Option to Extend Loan Agreement, Term

+ References

No definition available.

+ Details

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- Definition

Number of Options to Extend Loan Agreement

+ References

No definition available.

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- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

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