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Commercial Mortgage Loan Portfolio (Parenthetical) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |
Senior sub-participation interest in New York, NY Hotel Loan | $ 120,000
Interest rate on New York, NY Hotel Loan | 1.72%
Repayment of first mortgage | $ 33,000
Mortgage loan fee percentage | 0.50%
Origination fee | 1.00%
LIBOR floor | 0.50%

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- Definition First mortgage loan. + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition First mortgage loan fee. + References No definition available. + Details
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Namespace Prefix: | ari_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Libor Floor Percentage Rate + References No definition available. + Details
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Period Type: | duration

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- Definition Mortgage loans basis spread on variable rate. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Origination fee percentage. + References No definition available. + Details
Name: | ari_OriginationFeePercentage
Namespace Prefix: | ari_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Repayment of first mortgage loans. + 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
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Balance Type: | na
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