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FEDERAL INCOME TAXES Tax Status of Dividends (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Required Distribution Rate to Maintain REIT Status (in percent) 90.00%akr_RequiredDistributionRateToMaintainReitStatus    
Ordinary income 69.00%akr_AllocationOfDividendsOrdinaryIncomePercent 87.00%akr_AllocationOfDividendsOrdinaryIncomePercent 63.00%akr_AllocationOfDividendsOrdinaryIncomePercent
Qualified dividend 0.00%akr_AllocationOfDividendsQualifiedDividendPercent 0.00%akr_AllocationOfDividendsQualifiedDividendPercent 0.00%akr_AllocationOfDividendsQualifiedDividendPercent
Capital gain 31.00%akr_AllocationOfDividendsCapitalGainPercent 13.00%akr_AllocationOfDividendsCapitalGainPercent 37.00%akr_AllocationOfDividendsCapitalGainPercent
Total 100.00%akr_AllocationOfDividendsPercent 100.00%akr_AllocationOfDividendsPercent 100.00%akr_AllocationOfDividendsPercent