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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]        
Total investments at fair value $ 2,505,992,000 [1]   $ 2,505,992,000 [1] $ 2,448,935,000 [2]
Interest [2],[3],[4],[5]       8.80%
Percent of net assets 207.50% [1]   207.50% [1] 205.40% [2]
Non-qualifying assets 26.50%   26.50% 25.90%
Credit support agreements $ 1,978,000   $ 7,564,000  
MVC Credit Support Agreement        
Schedule of Investments [Line Items]        
Credit support agreements     2,050,000 $ (1,214,000)
MVC Credit Support Agreement | Barings LLC        
Schedule of Investments [Line Items]        
Credit support agreements   $ (1,214,000) 2,050,000 (1,214,000)
MVC Private Equity Fund LP        
Schedule of Investments [Line Items]        
Total investments at fair value 1,487,000 [1]   1,487,000 [1] 1,838,000 [2]
Control investments        
Schedule of Investments [Line Items]        
Total investments at fair value $ 106,958,000 [1]   $ 106,958,000 [1] $ 106,328,000 [2]
Percent of net assets 8.90% [1]   8.90% [1] 8.90% [2]
Control investments | MVC Private Equity Fund LP        
Schedule of Investments [Line Items]        
Total investments at fair value $ 1,487,000   $ 1,487,000 $ 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 $ 1,100,000,000
[1] All of the investment is or will be encumbered as security for the Company’s $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[2] All of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.
[3] Debt investment includes interest rate floor feature.
[4] The fair value of the investment was determined using significant unobservable inputs.
[5] The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.