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Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jul. 01, 2020
Debt Instrument [Line Items]      
Long-term debt outstanding $ 1,672,957 $ 1,770,054  
Maximum borrowing capacity 900,000    
Letters of credit, outstanding amount 33,800 35,600  
Fund Portfolio | Fund II      
Debt Instrument [Line Items]      
Long-term debt outstanding 234,110 228,282  
Unsecured Debt      
Debt Instrument [Line Items]      
Maximum borrowing capacity 700,000    
Unsecured Debt | Fund IV | Letter of Credit      
Debt Instrument [Line Items]      
Letters of credit, outstanding amount 3,600 3,600  
Unsecured Debt | Core Portfolio      
Debt Instrument [Line Items]      
Long-term debt outstanding 400,000 380,000  
Term Loan      
Debt Instrument [Line Items]      
Term loan $ 0 30,000 $ 30,000
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
Unsecured Notes Payable | Unsecured Debt      
Debt Instrument [Line Items]      
Debt available balance $ 124,600 128,700  
Unsecured Notes Payable | Unsecured Debt | Fund Portfolio | Fund II      
Debt Instrument [Line Items]      
Long-term debt outstanding 40,000 40,000  
Three Hundred And Fifty Millions Term Loan | Unsecured Debt | Core Portfolio      
Debt Instrument [Line Items]      
Long-term debt outstanding   350,000  
Four Hundred Million Term Loan [Member] | Unsecured Debt      
Debt Instrument [Line Items]      
Maximum borrowing capacity 400,000    
Four Hundred Million Term Loan [Member] | Unsecured Debt | Core Portfolio      
Debt Instrument [Line Items]      
Long-term debt outstanding 400,000    
Term Loan Maturing In September 2020 | Secured Debt | Fund II      
Debt Instrument [Line Items]      
Maximum borrowing capacity 40,000    
Long-term line of credit, noncurrent 40,000 40,000  
Remaining borrowing capacity 0 0  
Subscription Line | Unsecured Debt | Fund IV      
Debt Instrument [Line Items]      
Maximum borrowing capacity 5,000    
Long-term line of credit, noncurrent 0 900  
Remaining borrowing capacity 1,400 500  
Subscription Line | Unsecured Debt | Fund V      
Debt Instrument [Line Items]      
Maximum borrowing capacity 150,000    
Subscription Line | Unsecured Debt | Fund V | Letter of Credit      
Debt Instrument [Line Items]      
Letters of credit, outstanding amount 22,200 21,500  
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V      
Debt Instrument [Line Items]      
Long-term debt outstanding 4,604 250  
Remaining borrowing capacity $ 123,200 $ 128,200