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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 segment | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Number of reportable segments | 3 us-gaap_NumberOfReportableSegments |
Revenues | $ 52,481 us-gaap_RealEstateRevenueNet | $ 46,685 us-gaap_RealEstateRevenueNet
Property operating expenses, other operating and real estate taxes | (16,143)akr_PropertyOperatingExpensesAndRealEstateTaxes | (13,481)akr_PropertyOperatingExpensesAndRealEstateTaxes
General and administrative expenses | (7,532)us-gaap_GeneralAndAdministrativeExpense | (6,896)us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization | (13,658)us-gaap_DepreciationAndAmortization | (11,587)us-gaap_DepreciationAndAmortization
Operating income | 15,148 us-gaap_OperatingIncomeLoss | 14,721 us-gaap_OperatingIncomeLoss
Equity in (losses) earnings of unconsolidated affiliates | 6,593 us-gaap_IncomeLossFromEquityMethodInvestments | 3,029 us-gaap_IncomeLossFromEquityMethodInvestments
Gain on disposition of property |  | 12,387 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Loss on debt extinguishment | (109)us-gaap_GainsLossesOnExtinguishmentOfDebt | (203)us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain on disposition of property | 27,143 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | 12,387 us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Interest and other finance expense | (8,821)us-gaap_InterestAndDebtExpense | (10,651)us-gaap_InterestAndDebtExpense
Income tax provision | (1,417)us-gaap_IncomeTaxExpenseBenefit | (168)us-gaap_IncomeTaxExpenseBenefit
Net income | 38,537 us-gaap_ProfitLoss | 19,115 us-gaap_ProfitLoss
Net income | 38,537 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 19,115 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Net (income) loss attributable to noncontrolling interests | (21,990)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2,480 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Common Shareholders | 16,547 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 21,595 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Real Estate at Cost | 2,504,302 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost | 1,922,910 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
Total Assets | 2,870,866 akr_AssetsContinuedOperations | 2,345,862 akr_AssetsContinuedOperations
Acquisition of Real Estate | 220,271 akr_RealEstateAcquired1 | 90,500 akr_RealEstateAcquired1
Investment in Redevelopment and Improvements | 40,494 akr_InvestmentinRedevelopmentandImprovements1 | 37,505 akr_InvestmentinRedevelopmentandImprovements1
Core Portfolio |  |
Segment Reporting Information [Line Items] |  |
Revenues | 35,593 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 30,149 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Property operating expenses, other operating and real estate taxes | (9,691)akr_PropertyOperatingExpensesAndRealEstateTaxes / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | (7,906)akr_PropertyOperatingExpensesAndRealEstateTaxes / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
General and administrative expenses | (6,811)us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | (6,413)us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Depreciation and amortization | (9,907)us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | (8,333)us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Operating income | 9,184 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 7,497 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Equity in (losses) earnings of unconsolidated affiliates | 434 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 95 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Gain on disposition of property |  | 12,387 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Loss on debt extinguishment | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Gain on disposition of property | 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Interest and other finance expense | (6,468)us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | (7,200)us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Income tax provision | (480)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | (104)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Net income | 2,670 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Net income |  | 12,675 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Net (income) loss attributable to noncontrolling interests | (179)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | (419)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Net income attributable to Common Shareholders | 2,491 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 12,256 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Real Estate at Cost | 1,550,695 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 1,128,790 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Total Assets | 1,666,987 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 1,101,385 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Acquisition of Real Estate | 169,235 akr_RealEstateAcquired1 / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 90,500 akr_RealEstateAcquired1 / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Investment in Redevelopment and Improvements | 6,353 akr_InvestmentinRedevelopmentandImprovements1 / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 1,428 akr_InvestmentinRedevelopmentandImprovements1 / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Funds |  |
Segment Reporting Information [Line Items] |  |
Revenues | 13,480 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 12,642 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Property operating expenses, other operating and real estate taxes | (6,452)akr_PropertyOperatingExpensesAndRealEstateTaxes / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | (5,575)akr_PropertyOperatingExpensesAndRealEstateTaxes / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
General and administrative expenses | (721)us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | (483)us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Depreciation and amortization | (3,751)us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | (3,254)us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Operating income | 2,556 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 3,330 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Equity in (losses) earnings of unconsolidated affiliates | 6,159 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 2,934 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Gain on disposition of property |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Loss on debt extinguishment | (109)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | (203)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Gain on disposition of property | 27,143 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Interest and other finance expense | (2,353)us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | (3,451)us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Income tax provision | (937)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | (64)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Net income | 32,459 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember |
Net income |  | 2,546 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Net (income) loss attributable to noncontrolling interests | (21,811)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 2,899 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Net income attributable to Common Shareholders | 10,648 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 5,445 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Real Estate at Cost | 953,607 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 794,120 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Total Assets | 1,105,319 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 1,124,838 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Acquisition of Real Estate | 51,036 akr_RealEstateAcquired1 / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 0 akr_RealEstateAcquired1 / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Investment in Redevelopment and Improvements | 34,141 akr_InvestmentinRedevelopmentandImprovements1 / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 36,077 akr_InvestmentinRedevelopmentandImprovements1 / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Structured Financing |  |
Segment Reporting Information [Line Items] |  |
Revenues | 3,408 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 3,894 us-gaap_RealEstateRevenueNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Property operating expenses, other operating and real estate taxes | 0 akr_PropertyOperatingExpensesAndRealEstateTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 akr_PropertyOperatingExpensesAndRealEstateTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
General and administrative expenses | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Depreciation and amortization | 0 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Operating income | 3,408 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 3,894 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Equity in (losses) earnings of unconsolidated affiliates | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Gain on disposition of property |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Loss on debt extinguishment | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Gain on disposition of property | 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember |
Interest and other finance expense | 0 us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Income tax provision | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Net income | 3,408 us-gaap_ProfitLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember |
Net income |  | 3,894 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Net (income) loss attributable to noncontrolling interests | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Net income attributable to Common Shareholders | 3,408 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 3,894 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Real Estate at Cost | 0 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Total Assets | 98,560 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 119,639 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Acquisition of Real Estate | 0 akr_RealEstateAcquired1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 akr_RealEstateAcquired1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Investment in Redevelopment and Improvements | $ 0 akr_InvestmentinRedevelopmentandImprovements1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | $ 0 akr_InvestmentinRedevelopmentandImprovements1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember

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