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Subordinate Loans - Additional Information (Detail) (USD $)	1 Months Ended
	Feb. 28, 2013	Jan. 31, 2013
Mortgage Loans on Real Estate [Line Items]
Principal repayment received	$ 50,000
Yield maintenance payment	$ 2,500
IRR on loan investment	15.00%	17.00%
Mezzanine loans [Member]
Mortgage Loans on Real Estate [Line Items]
Number of loans for which principal amount received	2

X

- Definition

Number Of Loan

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X

- Definition

Percentage Of Internal Rate Of Return

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Namespace Prefix:	ari_
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Balance Type:	na
Period Type:	duration

X

- Definition

Principal Prepayment On Mortgage Debt

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Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Yield Maintenance Payment

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+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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