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Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items] |  |
Coupon | 5.60% | 5.60%
Yield | 4.10% | 4.30%
Weighted Average Life | 1 year 9 months 18 days | 1 year 2 months 12 days

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Period Type: | duration

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- Definition Yield + References No definition available. + Details
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Namespace Prefix: | ari_
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- Details
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