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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Total investments at fair value $ 2,556,114,000 $ 2,448,935,000
Interest [1],[2],[3]   8.80%
Percent of net assets 212.10% 205.40%
Non-qualifying assets 26.40% 25.90%
Credit support agreements $ 5,586,000  
MVC Credit Support Agreement    
Schedule of Investments [Line Items]    
Credit support agreements (328,000) $ (1,214,000)
MVC Credit Support Agreement | Barings LLC    
Schedule of Investments [Line Items]    
Credit support agreements (328,000) (1,214,000)
MVC Private Equity Fund LP    
Schedule of Investments [Line Items]    
Total investments at fair value 1,719,000 1,838,000
Control investments    
Schedule of Investments [Line Items]    
Total investments at fair value $ 99,205,000 $ 106,328,000
Percent of net assets 8.20% 8.90%
Control investments | MVC Private Equity Fund LP    
Schedule of Investments [Line Items]    
Total investments at fair value $ 1,719,000 $ 1,838,000
Control investments | MVC Private Equity Fund LP | General Partner    
Schedule of Investments [Line Items]    
Partners' capital account, return of capital   100,000,000
Control investments | MVC Private Equity Fund LP | Limited Partner    
Schedule of Investments [Line Items]    
Partners' capital account, return of capital   6,000,000,000.0
February 21, 2019 | Line of Credit    
Schedule of Investments [Line Items]    
Commitment aggregate amount $ 1,100,000,000 $ 1,100,000,000
[1] Debt investment includes interest rate floor feature.
[2] The fair value of the investment was determined using significant unobservable inputs.
[3] The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.