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Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($)
Jul. 31, 2020
Dec. 31, 2020
Dec. 17, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Oct. 08, 2019
Debt Instrument [Line Items]              
Long-term debt outstanding   $ 1,770,054,000       $ 1,717,928,000  
Maximum borrowing capacity             $ 750,000,000.0
Letters of credit, outstanding amount   35,600,000       19,800,000  
Fund Portfolio | Fund II              
Debt Instrument [Line Items]              
Long-term debt outstanding   228,282,000       24,225,000  
Unsecured Debt              
Debt Instrument [Line Items]              
Maximum borrowing capacity             $ 600,000,000.0
Unsecured Debt | Fund IV | Operating Partnership              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 50,800,000    
Unsecured Debt | Fund IV | Letter of Credit              
Debt Instrument [Line Items]              
Letters of credit, outstanding amount   3,600,000       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          
Term loan $ 30,000,000.0 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   128,700,000       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       0.0  
Bridge facility | Fund IV              
Debt Instrument [Line Items]              
Maximum borrowing capacity   79,200,000          
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       79,200,000  
Remaining borrowing capacity   0       0  
Subscription Line | Unsecured Debt | Fund IV              
Debt Instrument [Line Items]              
Maximum borrowing capacity   5,000,000.0   $ 15,000,000.0      
Long-term line of credit, noncurrent   900,000       8,400,000  
Remaining borrowing capacity   500,000       2,500,000  
Subscription Line | Unsecured Debt | Fund V              
Debt Instrument [Line Items]              
Maximum borrowing capacity   150,000,000.0          
Long-term line of credit, noncurrent   300,000          
Remaining borrowing capacity   128,200,000          
Subscription Line | Unsecured Debt | Fund V | Letter of Credit              
Debt Instrument [Line Items]              
Letters of credit, outstanding amount   21,500,000          
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V              
Debt Instrument [Line Items]              
Long-term debt outstanding   $ 250,000       0  
Remaining borrowing capacity           $ 150,000,000.0