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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