Name:	acre_VariableInterestEntityDueToCurrentAndNoncurrent
Namespace Prefix:	acre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the carrying amount of the Variable Interest Entity's loans held for investment included in the reporting entity's statement of financial position.

No definition available.

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

Represents the carrying amount of the Variable Interest Entity's other assets included in the reporting entity's statement of financial position.

No definition available.

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

Represents the carrying amount of the Variable Interest Entity's other assets certificates receivable included in the reporting entity's statement of financial position.

No definition available.

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

Face amount or stated value per share of common stock.

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

Name:	us-gaap_CommonStockSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.