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Leases - Activity for Reserves Related to Billed Rents and Straight-line Rents (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
Operating Leased Assets [Line Items] |
Balance at Beginning of Period | $ 45,408
Provision (Recovery) | 1,227
Write-Offs | (5,557)
Balance at End of Period | 41,078
Allowance for Credit Loss - Billed Rents |
Operating Leased Assets [Line Items] |
Balance at Beginning of Period | 30,366
Provision (Recovery) | 973
Write-Offs | (2,909)
Balance at End of Period | 28,430
Straight-line Rent Reserves |
Operating Leased Assets [Line Items] |
Balance at Beginning of Period | 15,042
Provision (Recovery) | 254
Write-Offs | (2,648)
Balance at End of Period | $ 12,648

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- Definition Rental lease receivable. + References No definition available. + Details
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Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Write-offs from rent receivable. + References No definition available. + Details
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Namespace Prefix: | akr_
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Balance Type: | credit
Period Type: | duration

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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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Balance Type: | credit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Balance Type: |
Period Type: |