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ORGANIZATION AND BASIS OF PRESENTATION Summary of General Terms and Operating Partnership's Equity Interests (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Fund I and Mervyns I |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 22.22%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1]
Committed Capital | $ 90.0 us-gaap_GeneralPartnersContributedCapital / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1]
Capital Called | 86.6 us-gaap_PartnersCapitalAccountContributions / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1],[2]
Equity Interest Held By Operating Partnership | 37.78%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1]
Preferred Return | 9.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1]
Capital Returned | 192.3 us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = akr_FundIAndMervynsIMember | [1],[2]
Fund II and Mervyns II |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 20.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [3]
Committed Capital | 300.0 us-gaap_GeneralPartnersContributedCapital / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [3]
Capital Called | 300.0 us-gaap_PartnersCapitalAccountContributions / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [2],[3]
Equity Interest Held By Operating Partnership | 20.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [3]
Preferred Return | 8.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [3]
Capital Returned | 131.6 us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = akr_FundIiAndMervynsIiMember | [2],[3]
Fund III |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 19.90%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital / dei_LegalEntityAxis = akr_FundIiiMember |
Committed Capital | 475.0 us-gaap_GeneralPartnersContributedCapital / dei_LegalEntityAxis = akr_FundIiiMember | [3]
Capital Called | 381.6 us-gaap_PartnersCapitalAccountContributions / dei_LegalEntityAxis = akr_FundIiiMember | [2]
Equity Interest Held By Operating Partnership | 19.90%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / dei_LegalEntityAxis = akr_FundIiiMember |
Preferred Return | 6.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn / dei_LegalEntityAxis = akr_FundIiiMember |
Capital Returned | 403.1 us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = akr_FundIiiMember | [2]
Fund IV |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Operating Partnership Share of Capital | 23.12%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerOwnershipShareOfCapital / dei_LegalEntityAxis = akr_FundIvMember |
Committed Capital | 540.6 us-gaap_GeneralPartnersContributedCapital / dei_LegalEntityAxis = akr_FundIvMember | [3]
Capital Called | 140.2 us-gaap_PartnersCapitalAccountContributions / dei_LegalEntityAxis = akr_FundIvMember | [2]
Equity Interest Held By Operating Partnership | 23.12%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / dei_LegalEntityAxis = akr_FundIvMember |
Preferred Return | 6.00%akr_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpMembersOrLimitedPartnersPreferredReturn / dei_LegalEntityAxis = akr_FundIvMember |
Capital Returned | $ 101.9 us-gaap_PartnersCapitalAccountDistributions / dei_LegalEntityAxis = akr_FundIvMember | [2]
[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] | Represents the total for the Funds, including the Operating Partnership and noncontrolling interests' shares.
[3] | 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.

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