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ACQUISITION AND DISPOSITION OF PROPERTIES, DISCONTINUED OPERATIONS AND PROPERTIES HELD FOR SALE Dispositions (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 sqft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 510,219 akr_GrossLeasableArea |
Sales Price | $ 388,840,000 akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross |
Gain/(Loss) | 155,618,000 akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross |
Walnut Hill Property [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Non-recourse debt | 22,900,000 akr_DisposalGroupIncludingDiscontinuedOperationsLongTermDebt / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_WalnutHillPropertyMember |
Lincoln Road Portfolio [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gain/(Loss) | 102,900,000 akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LincolnRoadPortfolioMember |
Core Portfolio [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 368,551 akr_GrossLeasableArea / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Core Portfolio [Member] | Walnut Hill Property [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 297,905 akr_GrossLeasableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_WalnutHillPropertyMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1]
Sales Price | 0 akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_WalnutHillPropertyMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1]
Gain/(Loss) | 12,402,000 akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_WalnutHillPropertyMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | [1]
Core Portfolio [Member] | Land Sale [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 0 akr_GrossLeasableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LandSaleMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Sales Price | 340,000 akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LandSaleMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Gain/(Loss) | 190,000 akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LandSaleMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Fund III [Member] | Sheepshead Bay [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 96,418 akr_GrossLeasableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_SheepsheadBayMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiiMember |
Sales Price | 20,200,000 akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_SheepsheadBayMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiiMember |
Gain/(Loss) | 1,399,000 akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_SheepsheadBayMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiiMember |
Fund III [Member] | Lincoln Road Portfolio [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 61,443 akr_GrossLeasableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LincolnRoadPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiiMember | [2]
Sales Price | 141,800,000 akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LincolnRoadPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiiMember | [2]
Gain/(Loss) | 86,600,000 akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LincolnRoadPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiiMember | [2]
Fund II [Member] | City Point [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 0 akr_GrossLeasableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_CityPointMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiMember | [3]
Sales Price | 26,300,000 akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_CityPointMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiMember | [3]
Gain/(Loss) | 561,000 akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_CityPointMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiMember | [3]
Fund II [Member] | Other Post-sale Adjustments [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 0 akr_GrossLeasableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_OtherPostsaleAdjustmentsMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiMember |
Sales Price | 0 akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_OtherPostsaleAdjustmentsMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiMember |
Gain/(Loss) | (176,000)akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_OtherPostsaleAdjustmentsMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIiMember |
Fund IV [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 472,551 akr_GrossLeasableArea / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
Fund IV [Member] | Lincoln Road Portfolio [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
GLA (in square feet) | 54,453 akr_GrossLeasableArea / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LincolnRoadPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [2]
Sales Price | 200,200,000 akr_ProceedsFromSaleOfRealEstateHeldForInvestmentGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LincolnRoadPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [2]
Gain/(Loss) | $ 54,642,000 akr_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = akr_LincolnRoadPortfolioMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember | [2]
[1] | This property was subject to $22.9 million of non-recourse debt and was foreclosed upon by the lender during March 2014, resulting in a $12.4 million gain.
[2] | Both the Fund III and Fund IV Lincoln Road Portfolios were unconsolidated and as such, the Company's share of gains related to these sales, which aggregated $102.9 million, are included in gain on disposition of properties of unconsolidated affiliates in the 2014 Consolidated Statement of Income.
[3] | Represents the sale of a portion of the residential air rights known as "Tower 2" associated with the Company's City Point development project.

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