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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Condominium conversion loan [Member] |  |
Contingencies And Commitments [Line Items] |  |
Unfunded loan commitments | $ 34,650 | $ 34,650
Condominium construction loan [Member] |  |
Contingencies And Commitments [Line Items] |  |
Unfunded loan commitments | $ 10,861 |

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- Details
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Namespace Prefix: | ari_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unfunded Loan Commitments + References No definition available. + Details
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