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Commitments and Contingencies - Loan Commitments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Commercial mortgage loans [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded Loan Commitments	$ 246,600us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_CommercialMortgageLoansMember
Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded Loan Commitments	$ 32,500us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = ari_SubordinateMortgageLoansMember

X

- 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

+ Details

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Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
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