Mortgage Loans on Real Estate, Number of Properties in a Portfolio

No definition available.

Name:	ari_MortgageLoansonRealEstateNumberofPropertiesinaPortfolio
Namespace Prefix:	ari_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph c
-Subparagraph Schedule IV
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 29
-Article 12

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

The aggregate amount of the participating mortgage obligation at the end of the accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=29639217&loc=d3e10013-112621

+ Details

Name:	us-gaap_ParticipatingMortgageLoansMortgageObligationsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The aggregate amount of the participation liability at the end of the accounting period.

+ References

+ Details

Name:	us-gaap_ParticipatingMortgageLoansParticipationLiabilitiesAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateLoanTypeAxis=ari_CommercialMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateLoanTypeAxis=ari_SubordinateMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=ari_MezzanineLoanAcquiredbyInvestmentFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=us-gaap_FirstMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_HotelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ari_HotelArubaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ParticipatingMortgageLoansAxis=ari_SeniorParticipationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ParticipatingMortgageLoansAxis=ari_JuniorParticipationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ParticipatingMortgageLoansAxis=us-gaap_ParticipatingMortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=ari_MezzanineLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=ari_SeniorHousingFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Participations Sold (Details) £ in Thousands	1 Months Ended	12 Months Ended
Participations Sold (Details) £ in Thousands	Jan. 31, 2015 USD ($) facility	Dec. 31, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Oct. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Feb. 28, 2015 USD ($)	Feb. 28, 2015 GBP (£)	Jan. 31, 2015 GBP (£)	Dec. 31, 2014 USD ($)	Aug. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	May. 31, 2014 USD ($)
Mortgage Loans on Real Estate [Line Items]
Participation sold, carrying amount		$ 118,201,000							$ 89,584,000
London Interbank Offered Rate (LIBOR) [Member]
Mortgage Loans on Real Estate [Line Items]
Basis point		4.40%
Commercial mortgage loans [Member]
Mortgage Loans on Real Estate [Line Items]
Face amount		$ 1,037,940,000							467,300,000
Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Face amount		964,955,000							$ 562,434,000
Mezzanine Loan, Acquired by Investment Funds [Member] \| Commercial mortgage loans [Member]
Mortgage Loans on Real Estate [Line Items]
Face amount		29,250,000	£ 19,850			$ 30,672,000	£ 20,000
Participation sold, carrying amount		$ 29,250,000	£ 19,850
Mezzanine Loan, Acquired by Investment Funds [Member] \| Commercial mortgage loans [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Mortgage Loans on Real Estate [Line Items]
Basis point		8.25%
First Mortgage [Member]
Mortgage Loans on Real Estate [Line Items]
Face amount					$ 33,000,000
First Mortgage [Member] \| Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Face amount				$ 227,000,000
Hotel - Aruba [Member] \| First Mortgage [Member] \| Hotel [Member] \| Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Face amount												$ 155,000,000
Senior Participation [Member] \| Hotel - Aruba [Member] \| Hotel [Member] \| Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Participations sold										$ 90,000,000	$ 90,000,000
Junior Participation [Member] \| Hotel - Aruba [Member] \| Hotel [Member] \| Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Participations sold										$ 65,000,000	$ 65,000,000
Participating Mortgages [Member] \| Subordinate Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Face amount		$ 88,983,000
Participation sold, carrying amount		$ 88,951,000
United Kingdom [Member] \| Mezzanine Loan [Member] \| Senior Housing Facility [Member] \| Commercial mortgage loans [Member]
Mortgage Loans on Real Estate [Line Items]
Face amount	$ 51,996,000							£ 34,519
Number of facilities \| facility	44