Name:	acre_LoansReceivableDescriptionOfVariableRateBasisWeightedAverageFloor
Namespace Prefix:	acre_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Mortgage Loans, Number of Loans in Non-Accrual Status

No definition available.

Name:	acre_MortgageLoansNumberofLoansinNonAccrualStatus
Namespace Prefix:	acre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Mortgage Loans on Real Estate Number of Loans Repaid or Sold, Since Inception

No definition available.

Name:	acre_MortgageLoansOnRealEstateNumberOfLoansRepaidOrSoldSinceInception
Namespace Prefix:	acre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the total commitment amount of the mortgage loan.

No definition available.

Name:	acre_MortgageLoansOnRealEstateTotalCommitmentAmount
Namespace Prefix:	acre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Mortgage Loans On Real Estate Total Commitment Amount Excluding Noncontrolling Interest

No definition available.

Name:	acre_MortgageLoansOnRealEstateTotalCommitmentAmountExcludingNoncontrollingInterest
Namespace Prefix:	acre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The cash outflow associated with purchasing loans held for investment purposes during the period and including noncash upsize and excluding capitalized funding.

No definition available.

Name:	acre_PaymentsToAcquireLoansHeldForInvestmentIncludingNonCashUpsizeAndExcludingCapitalizedFunding
Namespace Prefix:	acre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the percentage of loans held for investment having LIBOR floors.

No definition available.

Name:	acre_PercentageOfLoansHeldForInvestmentHavingLIBORFloors
Namespace Prefix:	acre_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 6
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

Name:	srt_MortgageLoansOnRealEstateCollectionsOfPrincipal
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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.

No definition available.

Name:	srt_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 3))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

Name:	srt_MortgageLoansOnRealEstateNumberOfLoans
Namespace Prefix:	srt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)