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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Summary of Investments in Unconsolidated Affiliates (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Real estate under development | $ 484,676 us-gaap_DevelopmentInProcess |  | $ 447,390 us-gaap_DevelopmentInProcess
Investments in and advances to unconsolidated affiliates | 184,500 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  | 184,352 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Total assets | 2,870,866 us-gaap_Assets |  | 2,732,600 us-gaap_Assets
Other liabilities | 27,196 us-gaap_OtherLiabilities |  | 25,148 us-gaap_OtherLiabilities
Total liabilities and equity | 2,870,866 us-gaap_LiabilitiesAndStockholdersEquity |  | 2,732,600 us-gaap_LiabilitiesAndStockholdersEquity
Distributions in excess of income from, and investments in, unconsolidated affiliates | (12,361)akr_DistributionsInExcessOfIncomeFromAndInvestmentsInUnconsolidatedAffiliates |  | (12,564)akr_DistributionsInExcessOfIncomeFromAndInvestmentsInUnconsolidatedAffiliates
Total revenues | 52,481 us-gaap_RealEstateRevenueNet | 46,685 us-gaap_RealEstateRevenueNet |
Operating Expenses | (37,333)us-gaap_OperatingExpenses | (31,964)us-gaap_OperatingExpenses |
Equity in earnings of unconsolidated affiliates | 6,593 us-gaap_IncomeLossFromEquityMethodInvestments | 3,029 us-gaap_IncomeLossFromEquityMethodInvestments |
Depreciation and amortization | (13,658)us-gaap_DepreciationAndAmortization | (11,587)us-gaap_DepreciationAndAmortization |
Loss on debt extinguishment | (109)us-gaap_GainsLossesOnExtinguishmentOfDebt | (203)us-gaap_GainsLossesOnExtinguishmentOfDebt |
Net income | 38,537 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 19,115 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |
Unconsolidated Affiliates |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Rental property, net | 388,590 us-gaap_RentalProperties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 387,739 us-gaap_RentalProperties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Real estate under development | 66,942 us-gaap_DevelopmentInProcess / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 60,476 us-gaap_DevelopmentInProcess / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Investments in and advances to unconsolidated affiliates | 7,548 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 11,154 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Other assets | 63,288 us-gaap_OtherAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 62,862 us-gaap_OtherAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Total assets | 526,368 us-gaap_Assets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 522,231 us-gaap_Assets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Loans Payable to Bank | 317,103 us-gaap_LoansPayableToBank / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 315,897 us-gaap_LoansPayableToBank / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Other liabilities | 71,551 us-gaap_OtherLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 66,116 us-gaap_OtherLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Partners’ equity | 137,714 us-gaap_PartnersCapital / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 140,218 us-gaap_PartnersCapital / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Total liabilities and equity | 526,368 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |  | 522,231 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember
Total revenues | 11,930 us-gaap_RealEstateRevenueNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember | 12,105 us-gaap_RealEstateRevenueNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |
Operating Expenses | (3,857)us-gaap_OperatingExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember | (3,815)us-gaap_OperatingExpenses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |
Interest Expense | (2,638)us-gaap_InterestExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember | (2,524)us-gaap_InterestExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |
Equity in earnings of unconsolidated affiliates | 66,655 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember | (328)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |
Depreciation and amortization | (2,307)us-gaap_DepreciationAndAmortization / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember | (2,706)us-gaap_DepreciationAndAmortization / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |
Loss on debt extinguishment | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember | (187)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |
Net income | 69,783 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember | 2,545 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = akr_UnconsolidatedAffiliatesMember |
Operating Partnership, as General Partner or Managing Member |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity in earnings of unconsolidated affiliates | 6,593 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember | 3,029 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |
Company’s share of net income | 6,691 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember | 3,127 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |
Amortization of Excess Investment | $ (98)akr_AmortizationOfExcessInvestment / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember | $ (98)akr_AmortizationOfExcessInvestment / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = akr_OperatingPartnershipAsGeneralPartnerOrManagingMemberMember |

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