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Schedule IV - Mortgage Loans on Real Estate (Parenthetical) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |
Aggregate cost for federal income tax purposes | $ 389,167

X
- Definition Real Estate Aggregate Cost For Tax Purposes + References No definition available. + Details
Name: | ari_RealEstateAggregateCostForTaxPurposes
Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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