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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 9 Months Ended 59 Months Ended
Mar. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
agreement
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
agreement
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
agreement
Feb. 04, 2016
USD ($)
Securities Financing Transaction [Line Items]                
Number of collateralized agreements | agreement   1   1     1  
Cost basis of securities purchased under collateralized agreements to resell   $ 30,000,000   $ 30,000,000     $ 30,000,000  
Fair value of securities purchased under collateralized agreements to resell   19,401,000   19,401,000     21,422,000  
Cash equivalents   0   0     0  
Investment income, interest, paid-in-kind   6,193,000 $ 5,699,000 21,993,000 $ 17,067,000      
Investment income, dividend, paid-in-kind   $ 5,995,000 3,705,000 $ 16,338,000 14,738,000      
Investments threshold period past due for nonaccrual status   30 days   30 days        
Income tax benefit (provision)   $ 43,000 9,000 $ (122,000) (129,000)      
Current income tax benefit (expense)   13,000 8,000 5,000 (15,000)      
Deferred income tax benefit (provision)   30,000 1,000 (127,000) (114,000)      
Deferred tax liability   $ 140,000   $ 140,000     $ 13,000  
Dividend reinvestment plan, share price percentage, threshold   110.00%   110.00%        
Investments in Majority-owned Subsidiaries                
Securities Financing Transaction [Line Items]                
Shares redeemed for a promissory note (in shares) | shares 105,030              
Investments in Majority-owned Subsidiaries | Debt Investments                
Securities Financing Transaction [Line Items]                
Redemption of shares paid-in-kind $ 11,315,000              
Interest rate 7.00%              
Common Stock                
Securities Financing Transaction [Line Items]                
Stock repurchase program, authorized amount               $ 50,000,000
Common stock repurchased   $ 0 $ 0 $ 0 $ 0 $ 2,948,000    
Common Stock | New Mountain Net Lease Corporation                
Securities Financing Transaction [Line Items]                
Sale of stock, number of shares issued (in shares) | shares 105,030              
Sale of stock, price per share (in dollars per share) | $ / shares $ 107.73              
Sale of stock, consideration received $ 11,315,000