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SEGMENT REPORTING Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Real Estate at Cost | $ 2,208,595 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost | $ 1,819,053 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost | $ 1,287,198 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost
Total Assets | 2,732,600 akr_AssetsContinuedOperations | 2,244,523 akr_AssetsContinuedOperations | 1,670,163 akr_AssetsContinuedOperations
Acquisition of Real Estate | 250,353 akr_RealEstateAcquired | 220,041 akr_RealEstateAcquired | 241,894 akr_RealEstateAcquired
Redevelopment and Property Improvement Costs | 140,118 akr_InvestmentinRedevelopmentandImprovements | 106,883 akr_InvestmentinRedevelopmentandImprovements | 82,127 akr_InvestmentinRedevelopmentandImprovements
Core Portfolio [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Real Estate at Cost | 1,366,017 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 1,059,257 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 722,345 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Total Assets | 1,615,436 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 1,012,553 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 727,423 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Acquisition of Real Estate | 203,103 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 143,616 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 175,556 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Redevelopment and Property Improvement Costs | 5,432 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 10,611 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember | 3,862 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = akr_CorePortfolioMember
Opportunity Funds [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Real Estate at Cost | 842,578 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 759,796 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 564,853 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Total Assets | 1,014,878 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 1,105,264 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 811,855 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Acquisition of Real Estate | 47,250 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 76,425 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 66,338 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Redevelopment and Property Improvement Costs | 134,686 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 96,272 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember | 78,265 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = akr_OpportunityFundsMember
Notes Receivable [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Real Estate at Cost | 0 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 akr_RealEstateInvestmentPropertyAndDevelopmentinProcessAtCost / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Total Assets | 102,286 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 126,706 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 130,885 akr_AssetsContinuedOperations / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Acquisition of Real Estate | 0 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | 0 akr_RealEstateAcquired / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember
Redevelopment and Property Improvement Costs | $ 0 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | $ 0 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember | $ 0 akr_InvestmentinRedevelopmentandImprovements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_NotesReceivableMember

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