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Leases - Schedule of Future Minimum Rental Revenues and Payments for Operating and Capital Leases (Parenthetical) (Details) $ in Millions | Jun. 30, 2019 USD ($)
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Leases [Abstract] |
Minimum rental payments of interest related to finance lease | $ 222.6

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- Definition Future minimum rental payments of interest related to finance lease. + References No definition available. + Details
Name: | akr_FutureMinimumRentalPaymentsOfInterestRelatedToFinanceLease
Namespace Prefix: | akr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration