XML 61 R50.htm IDEA: XBRL DOCUMENT
v3.20.2

Real Estate - Real Estate Under Development and Construction in Progress - Additional Information (Details) - property | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2018
Cortlandt Crossing | Fund III |  |
Property, Plant and Equipment [Line Items] |  |
Number of projects put into service during period | 1 |
Core Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of projects put into service during period |  | 1

X
- Definition Number of real estate projects put into service during period. + References No definition available. + Details
Name: | akr_NumberOfRealEstateProjectsPutIntoServiceDuringPeriod
Namespace Prefix: | akr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=akr_CortlandtCrossingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=akr_FundIIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=akr_CorePortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |