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Percentage Vintage, Property Type, and Location of Collateral Securing Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 100.00% | 100.00%
South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 21.80% | 23.00%
Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 21.40% | 21.90%
Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 23.80% | 21.00%
Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 33.00% | 34.10%
Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 40.50% | 36.50%
Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 23.20% | 26.60%
Multifamily [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 12.90% | 13.10%
Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 10.50% | 10.80%
Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 12.90% | 13.00%
2006 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 1.00% | 7.00%
2007 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 99.00% | 93.00%

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- Definition Percentage Vintage + References No definition available. + Details
Name: | ari_PercentageVintage
Namespace Prefix: | ari_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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