Leases - Schedule of Future Minimum Rental Revenues and Payments for Operating and Capital Leases (Parenthetical) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Leases [Abstract]
Minimum rental payments of interest related to finance lease	$ 6.4
Minimum rental payments of interest related to operating lease	$ 101.8

Future minimum rental payments of interest related to operating lease.

No definition available.

Name:	akr_FutureMinimumRentalPaymentsOfInterestRelatedToOperatingLease
Namespace Prefix:	akr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant