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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 (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 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 | 22.90% |  | 21.40% |
Pacific [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 21.70% |  | 23.80% |
South Atlantic [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 21.10% |  | 21.80% |
Other [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 34.30% | [1] | 33.00% | [1]
Office Complex - Missouri |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 40.00% |  | 40.50% |
Retail [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 22.10% |  | 23.20% |
Hotel [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 13.00% |  | 10.50% |
Multifamily [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 12.30% |  | 12.90% |
Other [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 12.60% | [1] | 12.90% | [1]
2006 [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 0.00% |  | 1.00% |
2007 [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Percentage Vintage | 100.00% |  | 99.00% |
[1] | No other individual category comprises more than 10% of the total.

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

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