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Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($)
Jul. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Oct. 08, 2019
Mar. 31, 2019
Debt Instrument [Line Items]          
Long-term debt outstanding   $ 1,796,275,000 $ 1,717,928,000    
Maximum borrowing capacity       $ 750,000,000.0  
Letters of credit, outstanding amount   14,600,000 19,800,000    
Fund Portfolio | Fund II          
Debt Instrument [Line Items]          
Long-term debt outstanding   26,670,000 24,225,000    
Unsecured Debt          
Debt Instrument [Line Items]          
Maximum borrowing capacity       $ 600,000,000.0  
Long-term line of credit, noncurrent   8,400,000 2,500,000    
Unsecured Debt | Fund IV | Letter of Credit          
Debt Instrument [Line Items]          
Letters of credit, outstanding amount   4,100,000 4,100,000    
Unsecured Debt | Core Portfolio          
Debt Instrument [Line Items]          
Long-term debt outstanding   380,000,000 350,000,000    
Term Loan          
Debt Instrument [Line Items]          
Debt available balance   0.0      
Term loan $ 30,000,000.0 30,000,000.0      
Debt instrument, maturity date Jun. 30, 2021        
LIBOR plus 2.55%        
LIBOR floor 0.75%        
Term Loan | Maximum          
Debt Instrument [Line Items]          
Debt available balance $ 90,000,000.0        
Unsecured Notes Payable | Unsecured Debt          
Debt Instrument [Line Items]          
Debt available balance   157,300,000 152,500,000    
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | Fund II          
Debt Instrument [Line Items]          
Long-term debt outstanding   40,000,000 40,000,000    
Three Hundred And Fifty Millions Term Loan | Unsecured Debt | Core Portfolio          
Debt Instrument [Line Items]          
Long-term debt outstanding   350,000,000.0 350,000,000.0    
Term Loan Maturing In September 2020 | Secured Debt | Fund II          
Debt Instrument [Line Items]          
Maximum borrowing capacity   40,000,000.0      
Long-term line of credit, noncurrent   40,000,000.0 40,000,000.0    
Remaining borrowing capacity   0 0    
Bridge facility | Unsecured Debt | Fund IV          
Debt Instrument [Line Items]          
Maximum borrowing capacity   79,200,000      
Long-term line of credit, noncurrent   79,200,000 0.0    
Bridge facility | Unsecured Debt | Fund IV | Operating Partnership          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 50,800,000
Subscription Line | Unsecured Debt | Fund IV          
Debt Instrument [Line Items]          
Maximum borrowing capacity   15,000,000.0      
Long-term line of credit, noncurrent   3,600,000 7,300,000    
Subscription Line | Unsecured Debt | Fund V          
Debt Instrument [Line Items]          
Maximum borrowing capacity   150,000,000.0      
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V          
Debt Instrument [Line Items]          
Long-term debt outstanding   0.0 0.0    
Remaining borrowing capacity   $ 150,000,000.0 $ 150,000,000.0