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Commercial Mortgage Loans - Additional Information (Detail) (Hotel [Member], Maryland [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Hotel [Member] | Maryland [Member]
Mortgage Loans on Real Estate [Line Items]
Fees received on transfer of controlling ownership	$ 280

X

- Definition

Fees Received On Loan Transfer

+ References

No definition available.

+ Details

Name:	ari_FeesReceivedOnLoanTransfer
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration