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ACQUISITION AND DISPOSITION OF REAL ESTATE AND PROPERTIES HELD FOR SALE - Acquisition (Details) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |
Gross leasable area (in square feet) | 298,794 akr_GrossLeasableArea |
Purchase Price | $ 230,036,000 us-gaap_BusinessCombinationConsiderationTransferred1 |
Assumption of Debt | 9,765,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |
Land | 57,509,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand |
Buildings and improvements | 172,527,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements |
Total consideration | 220,271,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |
Core Portfolio |  |
Business Acquisition [Line Items] |  |
Gross leasable area (in square feet) | 245,500 akr_GrossLeasableArea / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Purchase Price | 179,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Assumption of Debt | 9,765,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Acquisition costs | 600,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Fund IV |  |
Business Acquisition [Line Items] |  |
Gross leasable area (in square feet) | 53,294 akr_GrossLeasableArea / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
Purchase Price | 51,036,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
Assumption of Debt | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
Acquisition costs | 1,600,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
City Center | San Fransisco, CA | Core Portfolio |  |
Business Acquisition [Line Items] |  |
Gross leasable area (in square feet) | 205,000 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Purchase Price | 155,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Assumption of Debt | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_ElevenEastWaltonMember / invest_InvestmentGeographicRegionAxis = akr_ChicagoIllinoisMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
163 Highland Avenue | Needham, MA | Core Portfolio |  |
Business Acquisition [Line Items] |  |
Gross leasable area (in square feet) | 40,500 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Purchase Price | 24,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
Assumption of Debt | 9,765,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_SixtyOneMainStreetMember / invest_InvestmentGeographicRegionAxis = akr_WestPortConnecticutMember / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember |
1035 Third Avenue | New York, NY | Fund IV |  |
Business Acquisition [Line Items] |  |
Gross leasable area (in square feet) | 53,294 akr_GrossLeasableArea / us-gaap_BusinessAcquisitionAxis = akr_OneZeroThreeFiveThirdAvenueMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
Percent Owned | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = akr_OneZeroThreeFiveThirdAvenueMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
Purchase Price | 51,036,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = akr_OneZeroThreeFiveThirdAvenueMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
Assumption of Debt | 0 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = akr_OneZeroThreeFiveThirdAvenueMember / invest_InvestmentGeographicRegionAxis = akr_NewYorkNewYorkMember / us-gaap_StatementBusinessSegmentsAxis = akr_FundIvMember |
Acquisitions In 2014 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |
Land | 33,390,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member | 22,625,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member
Buildings and improvements | 55,249,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member | 67,875,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 4,705,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member | 0 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | 2,844,000 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member | 0 akr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member
Total consideration | 90,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member | 90,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member
Adjustments [Abstract] |  |
Land | 10,765,000 akr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentLand / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |
Buildings and improvements | (12,626,000)akr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |
Acquisition-related intangible assets (in Acquired lease intangibles, net) | 4,705,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) | (2,844,000)akr_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |
Total consideration | $ 0 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = akr_AcquisitionsIn2014Member |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of real estate acquired, at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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