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Leases - Activity for Reserves Related to Billed Rents and Straight-line Rents (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($)
Operating Leased Assets [Line Items] |
Balance at Beginning of Period | $ 45,408
Charged to Expenses | 3,882
Deductions | (1,337)
Balance at End of Period | 47,953
Allowance for Credit Loss - Billed Rents |
Operating Leased Assets [Line Items] |
Balance at Beginning of Period | 30,366
Charged to Expenses | 3,065
Deductions | (1,162)
Balance at End of Period | 32,269
Straight-line Rent Reserves |
Operating Leased Assets [Line Items] |
Balance at Beginning of Period | 15,042
Charged to Expenses | 817
Deductions | (175)
Balance at End of Period | $ 15,684

X
- Definition Charged to lease and rental expense. + References No definition available. + Details
Name: | akr_ChargedToLeaseAndRentalExpense
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deductions from rent receivable. + References No definition available. + Details
Name: | akr_DeductionsFromRentReceivable
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Rental lease receivable. + References No definition available. + Details
Name: | akr_RentalLeaseReceivable
Namespace Prefix: | akr_
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_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=akr_AllowanceForCreditLossBilledRentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=akr_StraightLineRentReserveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |