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Commercial Mortgage Loan Portfolio (Parenthetical) (Detail) (Commercial mortgage loans [Member], Condo Conversion [Member]) | 3 Months Ended
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Mar. 31, 2014 option
Condo Conversion - NY, NY December 2012 [Member] |
Mortgage Loans on Real Estate [Line Items] |
Number of options to extend loan agreement | 2
Option to extend loan agreement, term | 1 year
Condo Conversion - NY, NY August 2013 [Member] |
Mortgage Loans on Real Estate [Line Items] |
Option to extend loan agreement, term | 1 year

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- Definition Mortgage Loans, Option to Extend Loan Agreement, Term + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | xbrli:durationItemType
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- Definition Number of Options to Extend Loan Agreement + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration