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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2018
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2017
Schedule of Investments [Line Items]          
Investments at fair value   $ 2,332,492,000 [1] $ 2,332,492,000 [1] $ 1,800,594,000 [2]  
Interest [3],[4],[5]   7.80% 7.80%    
Percent of net assets   189.90% 189.90% 242.70%  
Non-qualifying assets   26.00% 26.00% 25.70%  
Credit support agreements   $ 3,440,000 $ (10,320,000)    
MVC Credit Support Agreement          
Schedule of Investments [Line Items]          
Credit support agreements     (4,320,000) $ 1,800,000  
MVC Credit Support Agreement | Barings LLC          
Schedule of Investments [Line Items]          
Credit support agreements     (4,320,000) 1,800,000  
Second Lien Callable Notes Due In 2025 | MVC | Affiliated Entity          
Schedule of Investments [Line Items]          
Investments at fair value         $ 5,700,000
Interest         9.50%
Investment owned, period adjustment to cost basis $ 3,000,000        
MVC Private Equity Fund LP          
Schedule of Investments [Line Items]          
Investments at fair value   1,678,000 1,678,000 7,564,000  
Control investments          
Schedule of Investments [Line Items]          
Investments at fair value   $ 117,126,000 $ 117,126,000 $ 22,412,000  
Percent of net assets   9.50% 9.50% 3.00%  
Control investments | MVC Private Equity Fund LP          
Schedule of Investments [Line Items]          
Investments at fair value   $ 1,678,000 $ 1,678,000 $ 7,564,000  
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 2019 Credit Facility | Line of Credit          
Schedule of Investments [Line Items]          
Commitment aggregate amount   $ 1,100,000,000 $ 1,100,000,000    
[1] Some or 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] Some or all of the investment is or will be encumbered as security for the Company's senior secured credit facility with ING Capital LLC.
[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 3 Month LIBOR, which as of September 30, 2022 was 3.75471%.