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Subordinate Loans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2012 Ski Resort - California [Member] | Dec. 31, 2012 Ski Resort - California [Member] | Dec. 31, 2011 Ski Resort - California [Member]
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Loan closed/ First mortgage |  | $ 246,959 | $ 149,086 | $ 58,985 | $ 40,000 | $ 40,000 | $ 40,000
Amendment fee | 0.50% |  |  |  |  |  |
Exit fee | 1.00% |  |  |  |  |  |
Interest rate on the mezzanine loan minimum |  |  |  |  | 0.75% |  |
Interest rate on the mezzanine loan maximum |  |  |  |  |  | 14.00% |

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- Definition Loan exit fees. + References No definition available. + Details
Name: | ari_LoanExitFeesPercentage
Namespace Prefix: | ari_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Loan extension fees. + References No definition available. + Details
Name: | ari_LoanExtensionFees
Namespace Prefix: | ari_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Mezzanine loans increase in interest rate. + References No definition available. + Details
Name: | ari_MezzanineLoansIncreaseInInterestRatePercentage
Namespace Prefix: | ari_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Mezzanine loans interest rate. + References No definition available. + Details
Name: | ari_MezzanineLoansInterestRate
Namespace Prefix: | ari_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Subordinate loans held for investments current face amount. + References No definition available. + Details
Name: | ari_SubordinateLoansHeldForInvestmentsCurrentFaceAmount
Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration