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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details)
12 Months Ended
Jun. 29, 2019
USD ($)
Dec. 31, 2014
property
JointVenture
Dec. 31, 2020
property
Jun. 30, 2020
property
May 26, 2020
USD ($)
property
Aug. 21, 2019
USD ($)
ft²
Apr. 30, 2019
USD ($)
ft²
Mar. 19, 2019
USD ($)
ft²
Oct. 31, 2018
segment
Schedule of Equity Method Investments [Line Items]                  
Number of retail properties | property     187            
Fund V Family Center at Riverdale                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage     89.42%            
Tri City Plaza                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage     90.00%            
Frederick County Acquisitions                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage     90.00%            
BSP I and BSP II                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage   50.00%              
Number of Joint Ventures | JointVenture   2              
Broughton St. Portfolio Savannah, GA                  
Schedule of Equity Method Investments [Line Items]                  
Purchase Price         $ 1,300,000        
Equity method investment, ownership percentage     100.00%            
Number of businesses acquired | property   23              
Number of retail properties | property         2        
Fund I Vs Broughton Street Portfolio Venture                  
Schedule of Equity Method Investments [Line Items]                  
Number of retail properties | property   8              
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA                  
Schedule of Equity Method Investments [Line Items]                  
Number of retail properties | property   2              
BSP I                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investment, ownership percentage                 100.00%
BSP I | Consolidated Entity                  
Schedule of Equity Method Investments [Line Items]                  
Number of retail properties | segment                 11
BSP II | Consolidated Affiliates                  
Schedule of Equity Method Investments [Line Items]                  
Number of retail properties | property       2          
Fund III's Storage Post venture                  
Schedule of Equity Method Investments [Line Items]                  
Distribution from cost method investment $ 1,600,000                
Cost method investments 0                
Fund III's Storage Post venture | Partnership Interest                  
Schedule of Equity Method Investments [Line Items]                  
Distribution from cost method investment $ 400,000                
Riverdale, Utah | Fund V Family Center at Riverdale                  
Schedule of Equity Method Investments [Line Items]                  
Joint venture interest percentage               99.35%  
Undivided interest in property percentage               90.00%  
Square footage of real estate property (in square feet) | ft²               428,000  
Purchase Price               $ 48,500,000  
Vernon, Connecticut | Tri City Plaza                  
Schedule of Equity Method Investments [Line Items]                  
Joint venture interest percentage             90.00%    
Square footage of real estate property (in square feet) | ft²             300,000    
Purchase Price             $ 36,700,000    
Frederick County, Maryland | Frederick County Acquisitions | 225,000 Square Foot Property                  
Schedule of Equity Method Investments [Line Items]                  
Joint venture interest percentage           90.00%      
Square footage of real estate property (in square feet) | ft²           225,000      
Purchase Price           $ 21,800,000      
Frederick County, Maryland | Frederick County Acquisitions | 300,00 Square Foot Property                  
Schedule of Equity Method Investments [Line Items]                  
Joint venture interest percentage           90.00%      
Square footage of real estate property (in square feet) | ft²           300,000      
Purchase Price           $ 33,100,000