XML 71 R57.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Real Estate - Real Estate Under Development and Construction in Progress - Additional Information (Details) - property | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Number of unconsolidated project in development | 1 |
Number of properties under development | 3 | 5
Fund Portfolio | Fund IV |  |
Property, Plant and Equipment [Line Items] |  |
Number of unconsolidated project in development |  | 4
Number of projects put into service during period |  | 3
Number of properties under development | 1 | 1
Core Portfolio |  |
Property, Plant and Equipment [Line Items] |  |
Number of projects put into service during period | 1 | 1
Number of properties under development | 1 | 2

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 Number of real estate properties under development. + References No definition available. + Details
Name: | akr_NumberOfRealEstatePropertiesUnderDevelopment
Namespace Prefix: | akr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of unconsolidated real estate project in development. + References No definition available. + Details
Name: | akr_NumberOfUnconsolidatedRealEstateProjectInDevelopment
Namespace Prefix: | akr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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_FundPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=akr_FundIVMember
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: |