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Debt Securities - Percentage Vintage, Property Type, and Location of Collateral Securing Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 100.00% | 100.00%
Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 22.70% | 21.40%
South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 22.50% | 21.80%
Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 22.10% | 23.80%
Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 32.70% | 33.00%
Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 41.00% | 40.50%
Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 22.90% | 23.20%
Multifamily [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 12.20% | 12.90%
Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 10.70% | 10.50%
Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 13.20% | 12.90%
2006 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage |  | 1.00%
2007 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 100.00% | 99.00%

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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