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Loan Proceeds Held by Servicer (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Receivables [Abstract] |  |
Loan proceeds held by servicer | $ 4,619 | $ 1,000

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- 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