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Long-Term Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 05, 2021
Jun. 30, 2026
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Jun. 05, 2019
Debt Instrument [Line Items]            
Ratio of indebtedness to net capital     702.00%      
DSCR less than 1.75x - Cash Flow Sweeping Event     175.00%      
DSCR less than 1.20x - Rapid Amortization Event     120.00%      
Interest-only DSCR less than 1.20x - Manager Termination Event     120.00%      
Interest-only DSCR less than 1.10x - Default Event     110.00%      
Debt service coverage ratio     345.00%      
Amortization of debt issuance costs     $ 500,000   $ 500,000  
Unamortized debt issuance costs     9,100,000 $ 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-I Notes            
Debt Instrument [Line Items]            
Debt interest rate (percent)     4.194% 4.194%   4.194%
Debt instrument, face amount           $ 700,000,000
Quarterly principal payment     $ 3,250,000      
Make-whole premium     $ 29,000,000      
2019 Class A-2-I Notes | Maximum            
Debt Instrument [Line Items]            
Ratio of indebtedness to net capital     525.00%      
2019 Class A-2-I Notes | Forecast            
Debt Instrument [Line Items]            
Additional interest on fixed rate   5.00%        
Debt instrument, term   10 years        
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%    
Debt instrument, face amount           600,000,000
Make-whole premium     $ 59,000,000      
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%        
2019 Class A-2 Notes            
Debt Instrument [Line Items]            
Quarterly principal payment     3,250,000 $ 3,250,000    
Annual principal payment     13,000,000.0      
2019 Class A-2 Notes | Forecast            
Debt Instrument [Line Items]            
Additional interest on fixed rate   5.00%        
Revolver            
Debt Instrument [Line Items]            
Debt interest rate (percent)       2.42%    
Letters of credit outstanding, amount     3,300,000      
Line of credit facility, current borrowing capacity     $ 221,700,000      
Revolver | Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt interest rate (percent)     2.40%      
Line of credit facility, maximum borrowing capacity     $ 225,000,000     $ 225,000,000
Fee on unused portion of line of credit (percent)     0.50%      
Long-term Line of Credit         220,000,000.0  
Maximum amount outstanding during period     $ 220,000,000.0      
Repayments of long-term lines of credit $ 220,000,000.0          
Unamortized debt issuance costs     $ 2,000,000.0      
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%      
2018-1 Class A-1 Notes            
Debt Instrument [Line Items]            
Amortization of debt issuance costs     $ 200,000   $ 200,000