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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Cost $ 2,535,576,000 [1] $ 2,562,398,000
Total investments at fair value $ 2,488,715,000 [1] $ 2,448,935,000
Percent of net assets 208.00% [1] 205.40%
Non-qualifying assets 28.80% 25.90%
Aerospace and Defense    
Schedule of Investments [Line Items]    
Total investments at fair value $ 132,498,000 $ 120,945,000
Percent of net assets 11.10% 10.10%
Automotive    
Schedule of Investments [Line Items]    
Total investments at fair value $ 80,828,000 $ 76,934,000
Percent of net assets 6.70% 6.50%
Banking, Finance, Insurance and Real Estate    
Schedule of Investments [Line Items]    
Total investments at fair value $ 401,816,000 $ 312,936,000
Percent of net assets 33.60% 26.20%
Beverage, Food and Tobacco    
Schedule of Investments [Line Items]    
Total investments at fair value $ 23,135,000 $ 34,690,000
Percent of net assets 1.90% 2.90%
Capital Equipment    
Schedule of Investments [Line Items]    
Total investments at fair value $ 128,706,000 $ 141,479,000
Percent of net assets 10.80% 11.90%
Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Total investments at fair value $ 35,897,000 $ 47,076,000
Percent of net assets 3.00% 3.90%
Construction and Building    
Schedule of Investments [Line Items]    
Total investments at fair value $ 30,387,000 $ 45,049,000
Percent of net assets 2.50% 3.80%
Consumer goods: Durable    
Schedule of Investments [Line Items]    
Total investments at fair value $ 47,074,000 $ 43,932,000
Percent of net assets 3.90% 3.70%
Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Total investments at fair value $ 28,210,000 $ 27,693,000
Percent of net assets 2.40% 2.30%
Containers, Packaging and Glass    
Schedule of Investments [Line Items]    
Total investments at fair value $ 37,524,000 $ 37,877,000
Percent of net assets 3.10% 3.20%
Energy: Electricity    
Schedule of Investments [Line Items]    
Total investments at fair value $ 20,874,000 $ 7,337,000
Percent of net assets 1.70% 0.60%
Energy: Oil and Gas    
Schedule of Investments [Line Items]    
Total investments at fair value $ 3,240,000 $ 4,776,000
Percent of net assets 0.30% 0.40%
Environmental Industries    
Schedule of Investments [Line Items]    
Total investments at fair value $ 53,484,000 $ 51,006,000
Percent of net assets 4.50% 4.30%
Healthcare and Pharmaceuticals    
Schedule of Investments [Line Items]    
Total investments at fair value $ 216,952,000 $ 203,576,000
Percent of net assets 18.10% 17.10%
High Tech Industries    
Schedule of Investments [Line Items]    
Total investments at fair value $ 303,082,000 $ 300,980,000
Percent of net assets 25.40% 25.20%
Hotel, Gaming and Leisure    
Schedule of Investments [Line Items]    
Total investments at fair value $ 54,256,000 $ 54,023,000
Percent of net assets 4.50% 4.50%
Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Total investments at fair value $ 110,066,000 $ 130,427,000
Percent of net assets 9.20% 10.90%
Media: Advertising, Printing and Publishing    
Schedule of Investments [Line Items]    
Total investments at fair value $ 39,447,000 $ 55,477,000
Percent of net assets 3.30% 4.70%
Media: Broadcasting and Subscription    
Schedule of Investments [Line Items]    
Total investments at fair value $ 13,277,000 $ 20,257,000
Percent of net assets 1.10% 1.70%
Media: Diversified and Production    
Schedule of Investments [Line Items]    
Total investments at fair value $ 64,559,000 $ 60,561,000
Percent of net assets 5.40% 5.10%
Metals and Mining    
Schedule of Investments [Line Items]    
Total investments at fair value $ 8,993,000 $ 33,125,000
Percent of net assets 0.80% 2.80%
Services: Business    
Schedule of Investments [Line Items]    
Total investments at fair value $ 326,762,000 $ 338,417,000
Percent of net assets 27.30% 28.40%
Services: Consumer    
Schedule of Investments [Line Items]    
Total investments at fair value $ 61,409,000 $ 67,070,000
Percent of net assets 5.10% 5.60%
Structured Products    
Schedule of Investments [Line Items]    
Total investments at fair value $ 102,922,000 $ 86,703,000
Percent of net assets 8.60% 7.30%
Telecommunications    
Schedule of Investments [Line Items]    
Total investments at fair value $ 27,565,000 $ 24,058,000
Percent of net assets 2.30% 2.00%
Transportation: Cargo    
Schedule of Investments [Line Items]    
Total investments at fair value $ 96,450,000 $ 89,398,000
Percent of net assets 8.10% 7.50%
Transportation: Consumer    
Schedule of Investments [Line Items]    
Total investments at fair value $ 11,951,000 $ 11,062,000
Percent of net assets 1.00% 0.90%
Utilities: Electric    
Schedule of Investments [Line Items]    
Total investments at fair value $ 22,696,000 $ 17,374,000
Percent of net assets 1.90% 1.50%
Utilities: Oil and Gas    
Schedule of Investments [Line Items]    
Total investments at fair value $ 4,655,000 $ 4,697,000
Percent of net assets 0.40% 0.40%
Percentage of Total Portfolio | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Aerospace and Defense    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 5.30% 4.90%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Automotive    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 3.30% 3.20%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Banking, Finance, Insurance and Real Estate    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 16.10% 12.80%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Beverage, Food and Tobacco    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.90% 1.40%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Capital Equipment    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 5.20% 5.80%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Chemicals, Plastics, and Rubber    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.50% 1.90%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Construction and Building    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.20% 1.80%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Consumer goods: Durable    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.90% 1.80%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.10% 1.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Containers, Packaging and Glass    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.50% 1.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Energy: Electricity    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.80% 0.30%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Energy: Oil and Gas    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.10% 0.20%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Environmental Industries    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.10% 2.10%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Healthcare and Pharmaceuticals    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 8.70% 8.30%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | High Tech Industries    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 12.20% 12.30%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Hotel, Gaming and Leisure    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.20% 2.20%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Investment Funds and Vehicles    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 4.40% 5.30%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Media: Advertising, Printing and Publishing    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.60% 2.30%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Media: Broadcasting and Subscription    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.50% 0.80%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Media: Diversified and Production    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.60% 2.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Metals and Mining    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.40% 1.40%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Services: Business    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 13.20% 13.80%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Services: Consumer    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.50% 2.70%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Structured Products    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 4.10% 3.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Telecommunications    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.10% 1.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Transportation: Cargo    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 3.90% 3.70%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Transportation: Consumer    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.50% 0.50%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Utilities: Electric    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.90% 0.70%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Utilities: Oil and Gas    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.20% 0.20%
Senior debt and 1st lien notes    
Schedule of Investments [Line Items]    
Cost $ 1,705,353,000 $ 1,752,943,000
Total investments at fair value $ 1,670,300,000 $ 1,696,192,000
Percent of net assets 140.00% 142.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 67.00% 69.00%
Senior debt and 1st lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 67.00% 69.00%
Subordinated debt and 2nd lien notes    
Schedule of Investments [Line Items]    
Cost $ 256,850,000 $ 326,639,000
Total investments at fair value $ 238,215,000 $ 263,139,000
Percent of net assets 20.00% 22.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 10.00% 13.00%
Subordinated debt and 2nd lien notes | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 10.00% 11.00%
Structured Products    
Schedule of Investments [Line Items]    
Cost $ 107,314,000 $ 88,805,000
Total investments at fair value $ 93,038,000 $ 73,550,000
Percent of net assets 8.00% 6.00%
Structured Products | Percentage of Total Portfolio | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 4.00% 3.00%
Structured Products | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 4.00% 3.00%
Equity shares    
Schedule of Investments [Line Items]    
Cost $ 320,335,000 $ 230,188,000
Total investments at fair value $ 374,704,000 $ 284,570,000
Percent of net assets 31.00% 24.00%
Equity shares | Percentage of Total Portfolio | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 13.00% 9.00%
Equity shares | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 15.00% 12.00%
Equity warrants    
Schedule of Investments [Line Items]    
Cost $ 76,000 $ 178,000
Total investments at fair value $ 2,392,000 $ 1,057,000
Percent of net assets 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 0.00%
Equity warrants | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 0.00%
Investments in joint ventures / PE fund    
Schedule of Investments [Line Items]    
Cost $ 145,648,000 $ 163,645,000
Total investments at fair value $ 110,066,000 $ 130,427,000
Percent of net assets 9.00% 11.00%
Investments in joint ventures / PE fund | Percentage of Total Portfolio | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 6.00% 6.00%
Investments in joint ventures / PE fund | Percentage of Total Portfolio, at Fair Value | Investment Type Concentration Risk    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 4.00% 5.00%
MVC Credit Support Agreement    
Schedule of Investments [Line Items]    
Credit support agreements $ 3,700,000 $ (1,214,000)
MVC Credit Support Agreement | Barings LLC    
Schedule of Investments [Line Items]    
Credit support agreements 3,700,000 (1,214,000)
Notional Amount 23,000,000 23,000,000
Sierra Credit Support Agreement    
Schedule of Investments [Line Items]    
Credit support agreements (3,900,000) (3,700,000)
Sierra Credit Support Agreement | Barings LLC    
Schedule of Investments [Line Items]    
Credit support agreements (3,900,000) (3,700,000)
Notional Amount 100,000,000 100,000,000
MVC Private Equity Fund LP    
Schedule of Investments [Line Items]    
Cost 8,160,000 [2] 9,124,000
Total investments at fair value 1,005,000 [2] 1,838,000
Control investments    
Schedule of Investments [Line Items]    
Cost 103,163,000 [2] 95,571,000
Total investments at fair value $ 90,920,000 [2] $ 106,328,000
Percent of net assets 7.60% [2] 8.90%
Control investments | MVC Private Equity Fund LP    
Schedule of Investments [Line Items]    
Total investments at fair value $ 1,005,000 $ 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 2019 Credit Facility | Line of Credit    
Schedule of Investments [Line Items]    
Commitment aggregate amount $ 1,100,000,000 $ 1,100,000,000
[1] Fair value as a percentage of net assets.
[2] As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” and “control” the portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the year ended December 31, 2023 in which the portfolio company is deemed to be a “Control Investment” of the Company were as follows:
December 31, 2022
Value		Gross Additions
(a)		Gross Reductions (b)Amount of Realized Gain (Loss)Amount of Unrealized Gain (Loss)December 31, 2023
Value		Amount of Interest or Dividends Credited to Income(c)
Portfolio CompanyType of Investment
Black Angus Steakhouses, LLC(d)
First Lien Senior Secured Term Loan (14.4% PIK)
$5,647 $1,330 $— $— $189 $7,166 $1,401 
First Lien Senior Secured Term Loan (10.0% PIK)(e)
9,147 — — — (4,278)4,869 — 
LLC Units (44.6 units)
— — — — — — — 
14,794 1,330 — — (4,089)12,035 1,401 
MVC Automotive Group GmbH(d)
Bridge Loan (4.5% Cash, 1.5% PIK)
7,149 2,613 — — — 9,762 587 
Common Equity Interest (18,000 Shares)
9,675 — — — 5,755 15,430 — 
16,824 2,613 — — 5,755 25,192 587 
MVC Private Equity Fund LP
General Partnership Interest
(1,831.4 units)
45 — (24)— 3 24 95 
Limited Partnership Interest
(71,790.4 units)
1,793 — (940)— 128 981 — 
1,838 — (964)— 131 1,005 95 
Security Holdings B.V(d)
Bridge Loan (5.0% PIK,)
6,020 308 — — — 6,328 309 
2023 Revolver (6.0% Cash)
— 3,840 (22)— 48 3,866 168 
Senior Subordinated Term Loan (3.1% PIK)
10,534 333 — — — 10,867 379 
Senior Unsecured Term Loan (6.0% Cash, 9.0% PIK)
2,015 154 — — 67 2,236 374 
Common Stock Series A (17,100 shares)
575 — — — (264)311 — 
Common Stock Series B (1,236 shares)
53,728 — — — (24,648)29,080 — 
72,872 4,635 (22)— (24,797)52,688 1,230 
Total Control Investments$106,328 $8,578 $(986)$— $(23,000)$90,920 $3,313 
(a) Gross additions include increases in the cost basis of investments resulting from new investments, follow-on investments, payment-in-kind interest or dividends, the amortization of any unearned income or discounts on debt investments, as applicable.
(b)     Gross reductions include decreases in the total cost basis of investments resulting from principal repayments, sales and return of capital.
(c)    Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.
(d) The fair value of the investment was determined using significant unobservable inputs.
(e) Non-accrual investment.