XML 59 R48.htm IDEA: XBRL DOCUMENT
v3.20.2

Real Estate - Schedule of Development in Process Activities (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) property | Dec. 31, 2019 USD ($) property | Dec. 31, 2018 USD ($) property
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 3 | 3 | 3
Real estate under development, beginning balance | $ 268,298 | $ 253,402 | $ 120,297
Transfers In | 33,057 | 117,344 |
Capitalized Costs | 10,876 | 25,580 |
Transfers Out | $ 29,037 | $ 9,819 |
Core Portfolio |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 0 | 0 | 1
Real estate under development, beginning balance | $ 63,946 | $ 60,863 | $ 7,759
Transfers In | 0 | 57,342 |
Capitalized Costs | 3,083 | 5,581 |
Transfers Out | $ 0 | $ 9,819 |
Fund Portfolio | Fund II |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 0 | 0 | 0
Real estate under development, beginning balance | $ 39,921 | $ 10,703 | $ 7,462
Transfers In | 33,057 | 0 |
Capitalized Costs | 2,631 | 3,241 |
Transfers Out | $ 6,470 | $ 0 |
Fund Portfolio | Fund III |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 1 | 1 | 1
Real estate under development, beginning balance | $ 23,266 | $ 36,240 | $ 21,242
Transfers In | 0 | 12,313 |
Capitalized Costs | 1,071 | 2,685 |
Transfers Out | $ 14,045 | $ 0 |
Fund Portfolio | Fund IV |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties under development | property | 2 | 2 | 1
Real estate under development, beginning balance | $ 141,165 | $ 145,596 | $ 83,834
Transfers In | 0 | 47,689 |
Capitalized Costs | 4,091 | 14,073 |
Transfers Out | $ 8,522 | $ 0 |

X
- Definition Development in process, capitalized costs. + References No definition available. + Details
Name: | akr_DevelopmentInProcessCapitalizedCosts
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Development in process, transfers in. + References No definition available. + Details
Name: | akr_DevelopmentInProcessTransfersIn
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Development in process, transfers out. + References No definition available. + Details
Name: | akr_DevelopmentInProcessTransfersOut
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
Name: | us-gaap_DevelopmentInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_CorePortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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