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Borrowings - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended	1 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Wells Facility borrowings [Member]	Dec. 31, 2012 Wells Facility borrowings [Member]	Feb. 28, 2013 JPMorgan Facility borrowings [Member]	Feb. 28, 2013 JPMorgan Facility borrowings [Member] First Year [Member]	Feb. 28, 2013 JPMorgan Facility borrowings [Member] Second Year [Member]	Feb. 28, 2013 AAA-rated CMBS [Member]	Mar. 31, 2013 Minimum [Member] Wells Facility borrowings [Member]	Dec. 31, 2012 Minimum [Member] Wells Facility borrowings [Member]	Feb. 28, 2013 Minimum [Member] AAA-rated CMBS [Member]	Feb. 28, 2013 Minimum [Member] Hilton CMBS [Member]	Mar. 31, 2013 Maximum [Member] Wells Facility borrowings [Member]	Dec. 31, 2012 Maximum [Member] Wells Facility borrowings [Member]	Feb. 28, 2013 Maximum [Member] AAA-rated CMBS [Member]	Feb. 28, 2013 Maximum [Member] Hilton CMBS [Member]
Debt Instrument [Line Items]
Basis point	2.30%		2.35%	2.50%			1.05%	1.05%	1.25%	1.25%	1.75%	1.75%	1.50%	1.50%	2.35%
Variable rate basis	London InterBank Offered Rate (“LIBOR”)	LIBOR	LIBOR
Extended maturity period				364 days
Loan extension fees					0.50%	0.25%
Maximum borrowing under facility		$ 212,343
Extension fee on outstanding repurchase price		0.50%

X

- Definition

Debt instrument extended maturity period.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Extension fees as percentage of outstanding balance.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Loan extension fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	ari_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant