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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 9 Months Ended 11 Months Ended
Mar. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
numberOfAgreement
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
numberOfAgreement
Sep. 30, 2022
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2022
USD ($)
numberOfAgreement
Feb. 04, 2016
USD ($)
Securities Financing Transaction [Line Items]                
Number of collateralized agreements | numberOfAgreement   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   16,500,000   16,500,000     16,539,000  
Cash equivalents   0   0     0  
Investment income, interest, paid-in-kind   7,917,000 $ 6,193,000 24,807,000 $ 21,993,000      
Investment income, dividend, paid-in-kind   $ 6,988,000 5,995,000 $ 20,225,000 16,338,000      
Investments threshold period past due for nonaccrual status   30 days   30 days        
Income tax provision (benefit)   $ (918,000) (43,000) $ 335,000 122,000      
Current income tax expense (benefit)   (627,000) (13,000) 401,000 (5,000)      
Deferred income tax provision (benefit)   (291,000) (30,000) (66,000) 127,000      
Deferred tax liability   $ 2,790,000   $ 2,790,000     $ 8,487,000  
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