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LONG-TERM INCENTIVE COMPENSATION (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	5 years
Share-based compensation expense	$ 1,889,000us-gaap_ShareBasedCompensation	$ 2,087,000us-gaap_ShareBasedCompensation
Trustee fee expense	200,000akr_TrusteeFeeExpense	100,000akr_TrusteeFeeExpense
Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	5 years
Percent of awards issued to officers subject to performance measures	17.00%akr_PercentOfAwardsIssuedToOfficersSubjectToPerformanceMeasures / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember
Other Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	3 years
Percent of awards issued to officers subject to performance measures	24.00%akr_PercentOfAwardsIssuedToOfficersSubjectToPerformanceMeasures / us-gaap_TitleOfIndividualAxis = akr_OtherOfficersMember
Other Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	3 years
Senior Executives | Long Term Investment Alignment Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of promote to be awarded as share based compensation awards			25.00%akr_MaximumPercentageOfPromoteToBeAwardedAsShareBasedCompensationAwards / us-gaap_PlanNameAxis = akr_LongTermInvestmentAlignmentProgramMember / us-gaap_TitleOfIndividualAxis = akr_SeniorExecutivesMember
Senior Executives | Long Term Investment Alignment Program | Fund IV
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of promote to be awarded as share based compensation awards			20.00%akr_MaximumPercentageOfPromoteToBeAwardedAsShareBasedCompensationAwards / us-gaap_PlanNameAxis = akr_LongTermInvestmentAlignmentProgramMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember / us-gaap_TitleOfIndividualAxis = akr_SeniorExecutivesMember
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares)	247,863us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsMember
LTIP Units | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares)	236,924us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember
LTIP Units | Other Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares)	7,879us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsMember / us-gaap_TitleOfIndividualAxis = akr_OtherOfficersMember
LTIP Units | Other Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares)	3,060us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsMember / us-gaap_TitleOfIndividualAxis = akr_OtherEmployeesMember
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares)	8,357us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock | Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares)	0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember
Restricted Stock | Other Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares)	1,308us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = akr_OtherOfficersMember
Restricted Stock | Other Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, share-based compensation, net of forfeitures (in shares)	7,049us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = akr_OtherEmployeesMember
LTIP Units and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted during period, value, share-based compensation, net of forfeitures	8,800,000us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember
Share-based compensation expense	500,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember
Long term incentive and share based compensation expense	$ 1,800,000akr_LongTermIncentiveAndShareBasedCompensationExpense / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember	$ 1,400,000akr_LongTermIncentiveAndShareBasedCompensationExpense / us-gaap_AwardTypeAxis = akr_LtipUnitsAndRestrictedStockMember
Vesting at the end of year three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	60.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember
Vesting ratably over last two years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	40.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember

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Long Term Incentive and Share Based Compensation Expense

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Maximum Percentage of Promote To Be Awarded as Share Based Compensation Awards. Promote is defined as the amount above a certain performance measurement threshold.

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Percent of Awards Issued to Officers Subject to Performance Measures

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Value, after forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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