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

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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 + Details
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |