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Long-Term Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 05, 2019
Mar. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt Instrument [Line Items]          
Ratio of indebtedness to net capital     405.00%    
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     460.00%    
Unamortized debt issuance costs     $ 6,800,000   $ 7,400,000
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]          
Additional interest on fixed rate 5.00%        
Debt instrument, term 10 years        
Quarterly principal payment $ 3,250,000   $ 3,250,000    
Covenant compliance, leverage ratio, maximum 525.00%        
Amortization of debt issuance costs     500,000 $ 500,000  
Unamortized debt issuance costs     6,800,000    
Annual principal payment     $ 13,000,000    
2019 Class A-2 Notes | Maximum          
Debt Instrument [Line Items]          
Ratio of indebtedness to net capital     525.00%    
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        
Make-whole premium     $ 3,000,000    
2019 Class A-2-I Notes | 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%
Debt instrument, face amount $ 600,000,000        
Make-whole premium     $ 18,000,000    
2019 Class A-2-II Notes | Ten Year United States Treasury Bill Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.64%        
Revolver          
Debt Instrument [Line Items]          
Letters of credit outstanding, amount     3,500,000    
Line of credit facility, current borrowing capacity     221,500,000    
Revolver | Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 225,000,000   $ 225,000,000    
Fee on unused portion of line of credit (percent)     0.50%    
Proceeds from credit facility   $ 220,000,000      
Repayments of long-term lines of credit   $ 220,000,000      
Long-term Line of Credit     $ 0    
Amortization of debt issuance costs     200,000 $ 200,000  
Unamortized debt issuance costs     $ 1,400,000    
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%    
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%    
Percentage of advances drawn     40.00%    
Revolver | Letter of Credit          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.15%