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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Business interruption insurance deductible         $ 100,000akr_BusinessInterruptionInsuranceDeductible
Impairment of asset 0us-gaap_ImpairmentOfRealEstate 8,183,000us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate    
Insurance proceeds from involuntary conversion of asset 0us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 0us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 3,672,000us-gaap_ProceedsFromInsuranceSettlementInvestingActivities    
Insurance proceeds from involuntary conversion of asset, other       6,900,000akr_ProceedsFromInsuranceSettlementOtherInvestingActivities  
Gain on involuntary conversion of asset 0akr_GainLossOnInvoluntaryAssetConversion 0akr_GainLossOnInvoluntaryAssetConversion 2,368,000akr_GainLossOnInvoluntaryAssetConversion    
Deferred rent receivables, net 28,000,000us-gaap_DeferredRentReceivablesNet 23,100,000us-gaap_DeferredRentReceivablesNet      
Allowance for doubtful accounts receivable 6,000,000us-gaap_AllowanceForDoubtfulAccountsReceivable 6,000,000us-gaap_AllowanceForDoubtfulAccountsReceivable      
Additional reserves 2,700,000us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease        
Required distribution rate to maintain REIT status (in percent) 90.00%akr_RequiredDistributionRateToMaintainReitStatus        
Loss of Anchor Tenant [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Additional reserves     400,000us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= akr_LossOfAnchorTenantMember		    
Flood [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Impairment of asset       1,400,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= us-gaap_FloodMember		  
Insurance recoveries       1,400,000us-gaap_InsuranceRecoveries
/ us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis
= us-gaap_FloodMember		  
Funiture, Fixtures and Equipment [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Property, plant and equipment, useful life, minimum (In Years) 5 years        
Minimum [Member] | Building [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Property, plant and equipment, useful life, minimum (In Years) 30 years        
Maximum [Member] | Building [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Property, plant and equipment, useful life, minimum (In Years) 40 years        
Operating Partnership, as General Partner or Managing Member [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Ownership interest by general partner or managing partner (in percent) 95.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember		        
Remaining funds rate of distribution to operating partnership (in percent) 20.00%akr_RemainingFundsRateOfDistributionToPartnership
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember		        
Institutional Investors [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Remaining funds rate of distribution to all partners (in percent) 80.00%akr_RemainingFundsRateOfDistributionToAllPartners
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_InstitutionalInvestorsMember		        
Fund I and Mervyns I [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Ownership interest by general partner or managing partner (in percent) 37.78%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= akr_FundIAndMervynsIMember		 [1]        
Operating partnership share of capital 22.22%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital
/ dei_LegalEntityAxis
= akr_FundIAndMervynsIMember		 [1]        
Committed capital 90,000,000us-gaap_GeneralPartnersContributedCapital
/ dei_LegalEntityAxis
= akr_FundIAndMervynsIMember		 [1]        
Capital called 86,600,000us-gaap_PartnersCapitalAccountContributions
/ dei_LegalEntityAxis
= akr_FundIAndMervynsIMember		 [1]        
Preferred return 9.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn
/ dei_LegalEntityAxis
= akr_FundIAndMervynsIMember		 [1]        
Total distributions 192,300,000us-gaap_PartnersCapitalAccountDistributions
/ dei_LegalEntityAxis
= akr_FundIAndMervynsIMember		 [1]        
Fund II and Mervyns II [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Ownership interest by general partner or managing partner (in percent) 20.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= akr_FundIiAndMervynsIiMember		 [2]        
Operating partnership share of capital 20.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital
/ dei_LegalEntityAxis
= akr_FundIiAndMervynsIiMember		 [2]        
Committed capital 300,000,000us-gaap_GeneralPartnersContributedCapital
/ dei_LegalEntityAxis
= akr_FundIiAndMervynsIiMember		 [2]        
Capital called 300,000,000us-gaap_PartnersCapitalAccountContributions
/ dei_LegalEntityAxis
= akr_FundIiAndMervynsIiMember		 [2]        
Preferred return 8.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn
/ dei_LegalEntityAxis
= akr_FundIiAndMervynsIiMember		 [2]        
Total distributions 131,600,000us-gaap_PartnersCapitalAccountDistributions
/ dei_LegalEntityAxis
= akr_FundIiAndMervynsIiMember		 [2]        
Fund II [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Total distributions   47,100,000us-gaap_PartnersCapitalAccountDistributions
/ dei_LegalEntityAxis
= akr_FundIiMember		 [2]      
Fund III [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Ownership interest by general partner or managing partner (in percent) 19.90%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= akr_FundIiiMember		 [3]        
Operating partnership share of capital 19.90%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital
/ dei_LegalEntityAxis
= akr_FundIiiMember		 [3]        
Committed capital 475,000,000us-gaap_GeneralPartnersContributedCapital
/ dei_LegalEntityAxis
= akr_FundIiiMember		 [3]        
Capital called 381,600,000us-gaap_PartnersCapitalAccountContributions
/ dei_LegalEntityAxis
= akr_FundIiiMember		 [3]        
Preferred return 6.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn
/ dei_LegalEntityAxis
= akr_FundIiiMember		 [3]        
Total distributions 368,500,000us-gaap_PartnersCapitalAccountDistributions
/ dei_LegalEntityAxis
= akr_FundIiiMember		 [3]        
Fund III [Member] | Walnut Hill Plaza [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Impairment of asset   1,500,000us-gaap_ImpairmentOfRealEstate
/ dei_LegalEntityAxis
= akr_FundIiiMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= akr_WalnutHillPlazaMember		      
Fund III [Member] | Sheepshead Bay [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Impairment of asset   6,700,000us-gaap_ImpairmentOfRealEstate
/ dei_LegalEntityAxis
= akr_FundIiiMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= akr_SheepsheadBayMember		      
Fund III [Member] | Operating Partnership, as General Partner or Managing Member [Member] | Sheepshead Bay [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Impairment of asset   1,300,000us-gaap_ImpairmentOfRealEstate
/ dei_LegalEntityAxis
= akr_FundIiiMember
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= akr_SheepsheadBayMember		      
Mervyns I and Mervyns II [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Impairment of asset     2,000,000us-gaap_ImpairmentOfRealEstate
/ dei_LegalEntityAxis
= akr_MervynsIAndMervynsIiMember		    
Fund IV [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Ownership interest by general partner or managing partner (in percent) 23.12%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
/ dei_LegalEntityAxis
= akr_FundIvMember		        
Operating partnership share of capital 23.12%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital
/ dei_LegalEntityAxis
= akr_FundIvMember		        
Committed capital 540,600,000us-gaap_GeneralPartnersContributedCapital
/ dei_LegalEntityAxis
= akr_FundIvMember		        
Capital called 140,200,000us-gaap_PartnersCapitalAccountContributions
/ dei_LegalEntityAxis
= akr_FundIvMember		 [3]        
Preferred return 6.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn
/ dei_LegalEntityAxis
= akr_FundIvMember		        
Total distributions 95,900,000us-gaap_PartnersCapitalAccountDistributions
/ dei_LegalEntityAxis
= akr_FundIvMember		 [3]        
Brandywine Portfolio [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Operating partnership share of capital 22.22%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital
/ dei_LegalEntityAxis
= akr_BrandywinePortfolioMember		        
Square footage of real estate property (in square feet) 1,000,000us-gaap_AreaOfRealEstateProperty
/ dei_LegalEntityAxis
= akr_BrandywinePortfolioMember		        
Core Portfolio [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Number of retail properties 87us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		        
Properties owned percentage 100.00%akr_PropertiesOwnedPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		        
Gain on involuntary conversion of asset     2,368,000akr_GainLossOnInvoluntaryAssetConversion
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioMember		    
Opportunity Funds [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Number of retail properties 56us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		        
Gain on involuntary conversion of asset     $ 0akr_GainLossOnInvoluntaryAssetConversion
/ us-gaap_StatementBusinessSegmentsAxis
= akr_OpportunityFundsMember		    
Core Portfolio and Opportunity Funds [Member]          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Number of retail properties 143us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementBusinessSegmentsAxis
= akr_CorePortfolioandOpportunityFundsMember		        
[1] Fund I and Mervyns I have returned all capital and preferred return. The Operating Partnership is now entitled to a Promote on all future cash distributions.
[2] During 2013, a distribution of $47.1 million was made to the Fund II investors, including the Operating Partnership. This amount is subject to recontribution to Fund II until December 2016, if needed to fund the on-going development and construction of existing projects.
[3] Represents the total for the Funds, including the Operating Partnership and noncontrolling interests' shares.