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Leases - Schedule of Future Minimum Rental Revenues and Payments for Operating and Capital Leases (Parenthetical) (Details) $ in Millions	Mar. 31, 2020 USD ($)
Leases [Abstract]
Minimum rental payments of interest related to finance lease	$ 211.2

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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