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Commercial Mortgage Loans - Additional Information (Detail) (Hotel [Member], Maryland [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Hotel [Member] | Maryland [Member] |
Mortgage Loans on Real Estate [Line Items] |
Fees received on transfer of controlling ownership | $ 280

X
- Definition Fees Received On Loan Transfer + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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