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Long-Term Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 05, 2021
Mar. 05, 2020
Jun. 30, 2026
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jun. 05, 2019
Debt Instrument [Line Items]                  
Ratio of indebtedness to net capital       494.00%   494.00%      
DSCR less than 1.75x - Cash Flow Sweeping Event       175.00%   175.00%      
DSCR less than 1.20x - Rapid Amortization Event       120.00%   120.00%      
Interest-only DSCR less than 1.20x - Manager Termination Event       120.00%   120.00%      
Interest-only DSCR less than 1.10x - Default Event       110.00%   110.00%      
Debt service coverage ratio       460.00%   460.00%      
Unamortized debt issuance costs       $ 8,500,000   $ 8,500,000   $ 11,800,000  
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Repayments of long-term lines of credit           $ 220,000,000.0      
Letter of Credit | Eurodollar                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           1.00%      
Letter of Credit | Base Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           1.15%      
Letter of Credit | Federal Funds Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           0.50%      
2019 Class A-2 Notes                  
Debt Instrument [Line Items]                  
Quarterly principal payment           $ 3,250,000      
Amortization of debt issuance costs       600,000 $ 500,000 1,100,000 $ 1,000,000.0    
Unamortized debt issuance costs       8,500,000   8,500,000      
Annual principal payment       $ 13,000,000.0   $ 13,000,000.0      
2019 Class A-2 Notes | Maximum                  
Debt Instrument [Line Items]                  
Ratio of indebtedness to net capital       525.00%   525.00%      
2019 Class A-2 Notes | Forecast                  
Debt Instrument [Line Items]                  
Additional interest on fixed rate     5.00%            
Debt instrument, term     10 years            
2019 Class A-2-I Notes                  
Debt Instrument [Line Items]                  
Debt interest rate (percent)       4.194%   4.194%   4.194% 4.194%
Debt instrument, face amount                 $ 700,000,000
Make-whole premium       $ 22,000,000   $ 22,000,000      
2019 Class A-2-I Notes | Forecast | Ten Year United States Treasury Bill Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     2.15%            
2019 Class A-2-II Notes                  
Debt Instrument [Line Items]                  
Debt interest rate (percent)       4.723%   4.723%   4.723% 4.723%
Debt instrument, face amount                 $ 600,000,000
Make-whole premium       $ 57,000,000   $ 57,000,000      
2019 Class A-2-II Notes | Forecast | Ten Year United States Treasury Bill Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     2.64%            
Revolver                  
Debt Instrument [Line Items]                  
Debt interest rate (percent)               2.42%  
Letters of credit outstanding, amount       3,300,000   3,300,000      
Line of credit facility, current borrowing capacity       221,700,000   221,700,000      
Revolver | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       225,000,000   $ 225,000,000     $ 225,000,000
Fee on unused portion of line of credit (percent)           0.50%      
Proceeds from credit facility   $ 220,000,000.0              
Maximum amount outstanding during period           $ 220,000,000.0      
Repayments of long-term lines of credit $ 220,000,000.0                
Long-term Line of Credit       0   $ 0      
Weighted average interest rate, over time           2.40%      
Amortization of debt issuance costs       100,000 $ 100,000 $ 300,000 $ 300,000    
Unamortized debt issuance costs       $ 1,800,000   $ 1,800,000      
Revolver | Revolving Credit Facility | Eurodollar                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           2.15%      
Revolver | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           2.15%      
Line Of Credit Facility, Percentage Of Advances Drawn           60.00%      
Revolver | Revolving Credit Facility | Commercial Paper Funding Rate Of Conduit Investor                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           2.15%      
Line Of Credit Facility, Percentage Of Advances Drawn           40.00%      
Revolver | Letter of Credit                  
Debt Instrument [Line Items]                  
Basis spread on variable rate           2.15%