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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 11 Months Ended
Mar. 30, 2020
USD ($)
$ / shares
shares
Mar. 31, 2024
USD ($)
numberOfAgreement
Mar. 31, 2023
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2023
USD ($)
numberOfAgreement
Feb. 04, 2016
USD ($)
Securities Financing Transaction [Line Items]            
Number of collateralized agreements | numberOfAgreement   1     1  
Securities purchased under collateralized agreements to resell, cost   $ 30,000,000     $ 30,000,000  
Securities purchased under agreements to resell   16,500,000     16,500,000  
Cash equivalents   0     0  
PIK interest income   9,654,000 $ 9,023,000      
Non-cash dividend income   $ 7,424,000 6,501,000      
Investments threshold period past due for nonaccrual status   30 days        
Deferred tax asset   $ 68,000     $ 594,000  
Dividend reinvestment plan, share price percentage, threshold   110.00%        
Investments in Majority-owned Subsidiaries            
Securities Financing Transaction [Line Items]            
Shares redeemed for a promissory note (in shares) | shares 105,030          
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 $ 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