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Loan Proceeds Held by Servicer (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Loan proceeds held by servicer	$ 0	$ 302,756,000

X

- Definition

Loan Principal Proceeds Held By Servicer

+ References

No definition available.

+ Details

Name:	ari_LoanPrincipalProceedsHeldByServicer
Namespace Prefix:	ari_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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