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Acquisitions - Schedule of Company Acquired Shopping Centers (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Vintage Plaza [Member] | Austin, TX [Member]    
Business Acquisition [Line Items]    
Date Acquired 2019-10  
Purchase Price $ 12.6  
The Blocks [Member] | Portland, OR [Member]    
Business Acquisition [Line Items]    
Date Acquired 2019-11  
Purchase Price $ 50.5  
Southtown Center [Member] | Tampa, FL [Member]    
Business Acquisition [Line Items]    
Date Acquired 2019-12  
Purchase Price $ 22.0  
Sharon Greens [Member] | Cumming, GA [Member]    
Business Acquisition [Line Items]    
Date Acquired   2018-11
Purchase Price   $ 13.4
Melbourne Shopping Center [Member] | Melbourne, FL [Member]    
Business Acquisition [Line Items]    
Date Acquired   2018-11
Purchase Price   $ 11.4
Market Square [Member] | Douglasville, GA [Member]    
Business Acquisition [Line Items]    
Date Acquired   2018-12
Purchase Price   $ 10.3