Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Feb. 13, 2018
Document And Entity Information [Abstract]      
Entity Registrant Name ACADIA REALTY TRUST    
Entity Central Index Key 0000899629    
Current Fiscal Year End Date --12-31    
Trading Symbol AKR    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding     81,703,355
Entity Public Float   $ 2,230.7  
Entity Shell Company false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes