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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 |  |  |  |  |  |  | $ 100,000 akr_BusinessInterruptionInsuranceDeductible
Impairment of asset | 0 us-gaap_ImpairmentOfRealEstate |  | 8,183,000 us-gaap_ImpairmentOfRealEstate |  | 0 us-gaap_ImpairmentOfRealEstate |  |
Insurance proceeds from involuntary conversion of asset | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities |  | 0 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities |  | 3,672,000 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities |  |
Insurance proceeds from involuntary conversion of asset, other |  |  |  |  |  | 6,900,000 akr_ProceedsFromInsuranceSettlementOtherInvestingActivities |
Gain on involuntary conversion of asset | 0 akr_GainLossOnInvoluntaryAssetConversion |  | 0 akr_GainLossOnInvoluntaryAssetConversion |  | 2,368,000 akr_GainLossOnInvoluntaryAssetConversion |  |
Deferred rent receivables, net | 28,000,000 us-gaap_DeferredRentReceivablesNet |  | 23,100,000 us-gaap_DeferredRentReceivablesNet |  |  |  |
Allowance for doubtful accounts receivable | 6,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivable |  | 6,000,000 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |  |  |
Additional reserves | 2,700,000 us-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 |  |  |  |  | 400,000 us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease / us-gaap_ValuationAllowancesAndReservesTypeAxis = akr_LossOfAnchorTenantMember |  |
Flood [Member] |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Impairment of asset |  |  |  |  |  | 1,400,000 us-gaap_ImpairmentOfRealEstate / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = us-gaap_FloodMember |
Insurance recoveries |  |  |  |  |  | 1,400,000 us-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 | 90,000,000 us-gaap_GeneralPartnersContributedCapital / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1] |  |  |  |  |
Capital called | 86,600,000 us-gaap_PartnersCapitalAccountContributions / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1] |  |  |  |  |
Preferred return | 9.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1] |  |  |  |  |
Total distributions | 192,300,000 us-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 | 300,000,000 us-gaap_GeneralPartnersContributedCapital / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [2] |  |  |  |  |
Capital called | 300,000,000 us-gaap_PartnersCapitalAccountContributions / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [2] |  |  |  |  |
Preferred return | 8.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [2] |  |  |  |  |
Total distributions | 131,600,000 us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [2] |  |  |  |  |
Fund II [Member] |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Total distributions |  |  | 47,100,000 us-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 | 475,000,000 us-gaap_GeneralPartnersContributedCapital / dei_LegalEntityAxis = akr_FundIiiMember | [3] |  |  |  |  |
Capital called | 381,600,000 us-gaap_PartnersCapitalAccountContributions / dei_LegalEntityAxis = akr_FundIiiMember | [3] |  |  |  |  |
Preferred return | 6.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn / dei_LegalEntityAxis = akr_FundIiiMember | [3] |  |  |  |  |
Total distributions | 368,500,000 us-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 |  |  | 1,500,000 us-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 |  |  | 6,700,000 us-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 |  |  | 1,300,000 us-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 |  |  |  |  | 2,000,000 us-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 | 540,600,000 us-gaap_GeneralPartnersContributedCapital / dei_LegalEntityAxis = akr_FundIvMember |  |  |  |  |  |
Capital called | 140,200,000 us-gaap_PartnersCapitalAccountContributions / dei_LegalEntityAxis = akr_FundIvMember | [3] |  |  |  |  |
Preferred return | 6.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn / dei_LegalEntityAxis = akr_FundIvMember |  |  |  |  |  |
Total distributions | 95,900,000 us-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) | 1,000,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = akr_BrandywinePortfolioMember |  |  |  |  |  |
Core Portfolio [Member] |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Number of retail properties | 87 us-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 |  |  |  |  | 2,368,000 akr_GainLossOnInvoluntaryAssetConversion / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |  |
Opportunity Funds [Member] |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |
Number of retail properties | 56 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |  |  |  |  |  |
Gain on involuntary conversion of asset |  |  |  |  | $ 0 akr_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 | 143 us-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.

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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