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Subsequent Events (Detail) - Line of Credit [Member] - Deutsche Bank Repurchase Facility [Member] | Apr. 30, 2017 EUR (€) | Apr. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 29, 2016 USD ($)
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Subsequent Event [Line Items] |  |  |  |  |
Maximum Amount of Borrowings |  |  | $ 355,200,000 | $ 300,000,000 | $ 355,200,000
General Facility [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Maximum Amount of Borrowings |  |  | $ 300,000,000 |  |
Subsequent Event [Member] | General Facility [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Maximum Amount of Borrowings | € 45,000,000 | $ 450,000,000 |  |  |

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- 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 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 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=ari_DeutscheBankRepurchaseFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=ari_GeneralFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |