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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 29, 2018
USD ($)
property
Jun. 29, 2018
USD ($)
property
May 15, 2018
USD ($)
Jan. 18, 2018
USD ($)
property
Jun. 30, 2017
USD ($)
Feb. 15, 2017
USD ($)
Jan. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
property
Dec. 21, 2017
USD ($)
property
Sep. 30, 2017
USD ($)
property
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
property
Dec. 31, 2018
USD ($)
property
segment
Dec. 31, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Dec. 31, 2014
property
JointVenture
Oct. 31, 2018
Schedule of Equity Method Investments [Line Items]                                    
Cost method investments                 $ 556,000         $ 556,000 $ 556,000      
Equity in earnings (losses) of unconsolidated affiliates                           $ 9,302,000 23,371,000 $ 39,449,000    
Number of retail properties | property                           171        
Proceeds from the disposition of properties, net                           $ 63,866,000 260,711,000 150,378,000    
Return of capital from unconsolidated affiliates and other                           $ 26,338,000 $ 43,684,000 $ 79,030,000    
Disposed of by sale                                    
Schedule of Equity Method Investments [Line Items]                                    
Number of retail properties | property               2 3   2   2   3      
Gain (loss) on disposal               $ 5,100,000 $ 35,900,000   $ 13,000,000 $ 3,300,000 $ 14,500,000          
Partnership Interest | Disposed of by sale                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal                       800,000 $ 2,700,000          
Mervyns I and Mervyns II                                    
Schedule of Equity Method Investments [Line Items]                                    
Distribution from equity method investment                             $ 1,100,000      
Equity method investments                 0           0      
Albertson's                                    
Schedule of Equity Method Investments [Line Items]                                    
Cost method investment ownership interest                           1.05%        
Distribution from cost method investment                             2,400,000      
Cost method investments                 0           0      
Equity in earnings (losses) of unconsolidated affiliates                             2,000,000      
Fund III's Storage Post venture                                    
Schedule of Equity Method Investments [Line Items]                                    
Distribution from cost method investment     $ 3,200,000                              
Cost method investments     0                              
Fund III's Storage Post venture | Partnership Interest                                    
Schedule of Equity Method Investments [Line Items]                                    
Distribution from cost method investment     $ 800,000                              
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]                                    
Equity method investments                 48,335,000         $ 3,236,000 48,335,000      
Equity method investment, ownership percentage                           50.00%        
Number of businesses acquired | property                                 23  
Number of retail properties | property                           13        
Fund I Vs Broughton Street Portfolio Venture                                    
Schedule of Equity Method Investments [Line Items]                                    
Number of retail properties | property   2                             8  
Losses on cost method investments   $ 1,000,000                                
Fund I Vs Broughton Street Portfolio Venture | Partnership Interest | Maximum                                    
Schedule of Equity Method Investments [Line Items]                                    
Losses on cost method investments   $ 100,000                                
Fund IV                                    
Schedule of Equity Method Investments [Line Items]                                    
Equity method investments                 82,143,000         $ 30,656,000 82,143,000      
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA                                    
Schedule of Equity Method Investments [Line Items]                                    
Number of retail properties | property 1     2           5             2  
Proceeds from the disposition of properties, net $ 2,000,000     $ 8,000,000                            
Gain (loss) on disposal (300,000)     (400,000)           $ 1,200,000                
Return of capital from unconsolidated affiliates and other                   11,000,000                
Fund IV | Disposed of by sale | 2819 Kennedy Boulevard                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal             $ 6,300,000                      
Consideration received             19,000,000                      
Return of capital from unconsolidated affiliates and other             10,600,000                      
Fund IV | Disposed of by sale | 2819 Kennedy Boulevard | Mortgages                                    
Schedule of Equity Method Investments [Line Items]                                    
Repayments of debt             8,400,000                      
Fund IV | Disposed of by sale | 1701 Belmont Avenue                                    
Schedule of Equity Method Investments [Line Items]                                    
Consideration received         $ 5,600,000             $ 5,600,000            
Return of capital from unconsolidated affiliates and other         2,700,000                          
Fund IV | Disposed of by sale | 1701 Belmont Avenue | Mortgages                                    
Schedule of Equity Method Investments [Line Items]                                    
Repayments of debt         2,900,000                          
Fund IV | Partnership Interest | Disposed of by sale | Broughton St. Portfolio Savannah, GA                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal       $ 0           100,000                
Fund IV | Partnership Interest | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Maximum                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal $ (100,000)                                  
Fund IV | Partnership Interest | Disposed of by sale | 2819 Kennedy Boulevard                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal             1,400,000                      
Fund IV | Consolidated Entity | Disposed of by sale | Broughton St. Portfolio Savannah, GA                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal                   $ 600,000                
Fund IV | Consolidated Entity | Disposed of by sale | 2819 Kennedy Boulevard                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal             $ 6,200,000                      
Fund IV | Consolidated Entity | Disposed of by sale | 1701 Belmont Avenue                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal         $ 3,300,000                          
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 | Unconsolidated Affiliates                                    
Schedule of Equity Method Investments [Line Items]                                    
Number of retail properties | property                           2        
Fund III                                    
Schedule of Equity Method Investments [Line Items]                                    
Equity method investments                 $ 373,000         $ 227,000 $ 373,000      
Fund III | Disposed of by sale | Arundel Plaza                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal           $ 8,200,000                        
Consideration received           28,800,000                        
Return of capital from unconsolidated affiliates and other           18,800,000                        
Fund III | Disposed of by sale | Arundel Plaza | Mortgages                                    
Schedule of Equity Method Investments [Line Items]                                    
Repayments of debt           10,000,000                        
Fund III | Partnership Interest | Disposed of by sale | Arundel Plaza                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal           1,300,000                        
Fund III | Consolidated Entity | Disposed of by sale | Arundel Plaza                                    
Schedule of Equity Method Investments [Line Items]                                    
Gain (loss) on disposal           $ 5,300,000