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ACQUISITION AND DISPOSITION OF REAL ESTATE AND PROPERTIES HELD FOR SALE - Dispositions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
sqft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Gross leasable area (in square feet) 298,794akr_GrossLeasableArea
Lincoln Park Centre  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Gross leasable area (in square feet) 61,761akr_GrossLeasableArea
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= akr_LincolnParkCentreMember
Sale Price $ 64,000akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross
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Gain on Sale $ 27,143akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross
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= akr_LincolnParkCentreMember