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Subordinate Loans - Company's Subordinate Loan Portfolio (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Hotel Portfolio - New York [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	Three one-year	Three one-year
Retail Center - Virginia [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	Two one-year	Two one-year
Hotel NY NY [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	One-year	One-year
Hotel - New York [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	Two one-year	Two one-year
Hotel Portfolio - Various [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	One-year	One-year
Condo Construction - NY, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	One-year
Unfunded loan commitments	10,861
Multifamily Conversion - NY, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	One-year
Condo Conversion [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	Two one-year	Two one-year
Unfunded loan commitments	34,650	34,650

X

- Definition

Extension options.

+ References

No definition available.

+ Details

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X

- Definition

Unfunded Loan Commitments

+ References

No definition available.

+ Details

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Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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