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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Funds (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 partner | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |
Investments in and advances to unconsolidated affiliates | 184,500 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 184,352 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Number of unaffiliated partners | 2 akr_NumberofUnaffiliatedPartners / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Mervyns I and Mervyns II | Opportunity Funds | KLA/Mervyns LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investments | 26,058 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = akr_MervynsIAndMervynsIiMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_KlaMervynsLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions, equity method investment | 48,547 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = akr_MervynsIAndMervynsIiMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_KlaMervynsLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Mervyns I | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Distributions, equity method investment | 4,500 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = akr_MervynsIMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Mervyns II | Opportunity Funds | KLA A Markets LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investments | 20,717 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_KlaMarketsLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions, equity method investment | 81,594 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_KlaMarketsLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Corporate Joint Venture | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Distributions | 154,103 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Investments in and advances to unconsolidated affiliates | 63,216 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
KLA/Mervyns LLC Add-On Investments | Mervyns I and Mervyns II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 7,547 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_MervynsIAndMervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlaMervynsLlcAddOnInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 9,272 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_MervynsIAndMervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlaMervynsLlcAddOnInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
KLAC Rex Venture LLC | Mervyns II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 2,701 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlacRexVentureLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 4,727 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlacRexVentureLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
KLA A Markets LLC Add-On Investments | Mervyns II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 2,416 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlaMarketsLlcAddOnInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 4,864 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlaMarketsLlcAddOnInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
KA-Shopko LLC | Fund II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 1,110 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KaShopkoLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 2,460 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KaShopkoLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Marsh and Add-On Investments | Fund II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 2,667 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KaMarshAndMarshAddOnLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 2,639 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KaMarshAndMarshAddOnLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | Mervyns I and Mervyns II | Opportunity Funds | KLA/Mervyns LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investments | 4,901 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = akr_MervynsIAndMervynsIiMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_KlaMervynsLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions, equity method investment | 11,801 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = akr_MervynsIAndMervynsIiMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_KlaMervynsLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | Mervyns II | Opportunity Funds | KLA A Markets LLC |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investments | 4,239 us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_KlaMarketsLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions, equity method investment | 16,318 us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = akr_KlaMarketsLlcMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | Corporate Joint Venture | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Distributions | 33,074 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Investments in and advances to unconsolidated affiliates | 12,070 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | KLA/Mervyns LLC Add-On Investments | Mervyns I and Mervyns II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 1,252 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_MervynsIAndMervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlaMervynsLlcAddOnInvestmentsMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 2,017 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_MervynsIAndMervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlaMervynsLlcAddOnInvestmentsMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | KLAC Rex Venture LLC | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Distributions, equity method investment | 900 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlacRexVentureLlcMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | KLAC Rex Venture LLC | Mervyns II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 535 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlacRexVentureLlcMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 946 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlacRexVentureLlcMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | KLA A Markets LLC Add-On Investments | Mervyns II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 388 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlaMarketsLlcAddOnInvestmentsMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 972 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_MervynsIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KlaMarketsLlcAddOnInvestmentsMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | KA-Shopko LLC | Fund II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 222 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KaShopkoLlcMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 492 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KaShopkoLlcMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Operating Partnership, as General Partner or Managing Member | Marsh and Add-On Investments | Fund II | Opportunity Funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Invested Capital and Advances, cost method investments | 533 us-gaap_CostMethodInvestments / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KaMarshAndMarshAddOnLlcMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Distributions | 528 us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = akr_FundIiMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = akr_KaMarshAndMarshAddOnLlcMember / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |

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