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Subordinate Loans - Additional Information (Detail) (USD $) | 1 Months Ended
--- | ---
Feb. 28, 2013 | Jan. 31, 2013
Mortgage Loans on Real Estate [Line Items] |  |
Principal repayment received | $ 50,000 |
Yield maintenance payment | $ 2,500 |
IRR on loan investment | 15.00% | 17.00%
Mezzanine loans [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans for which principal amount received | 2 |

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- Definition Number Of Loan + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Internal Rate Of Return + References No definition available. + Details
Name: | ari_PercentageOfInternalRateOfReturn
Namespace Prefix: | ari_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Principal Prepayment On Mortgage Debt + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Yield Maintenance Payment + References No definition available. + Details
Name: | ari_YieldMaintenancePayment
Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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