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ORGANIZATION AND BASIS OF PRESENTATION (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended
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Dec. 31, 2013 | Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Number of retail properties (in properties) |  | 145 us-gaap_NumberOfRealEstateProperties
Number of opportunity funds |  | 4 akr_NumberOfOpportunityFunds
Core Portfolio |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Number of retail properties (in properties) |  | 89 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Opportunity Funds |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Number of retail properties (in properties) |  | 56 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Fund II |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Payments of dividends | $ 47.1 us-gaap_PaymentsOfDividends / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiMember |
Operating Partnership, as General Partner or Managing Member |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Ownership interest by general partner or managing partner |  | 95.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember
Remaining funds rate of distribution to partnership |  | 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 |  | 80.00%akr_RemainingFundsRateOfDistributionToAllPartners / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_InstitutionalInvestorsMember

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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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