Investments - Additional Information (Detail) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2025 USD ($) company investment franchiseProfessional		Sep. 30, 2024 company	Sep. 30, 2025 USD ($) franchiseProfessional company investment		Sep. 30, 2024 company	Sep. 25, 2025 USD ($)	Apr. 30, 2025 USD ($)	Feb. 28, 2025 USD ($)	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) investment
Schedule of Investments [Line Items]
Amortized Cost	$ 1,012,284	[1],[2],[3]		$ 1,012,284	[1],[2],[3]						$ 892,940	[4],[5],[6]
Fair Value Percentage of Net Assets	98.60%	[1],[2],[3]		98.60%	[1],[2],[3]						92.70%	[4],[5],[6]
Number of franchise professionals | franchiseProfessional	1,300			1,300
Fair Value	$ 1,352,090	[1],[2],[3]		$ 1,352,090	[1],[2],[3]						$ 1,140,859	[4],[5],[6]
Investment owned, cost (as a percent)							0.03
Number of debt investments on non accrual status | investment	0			0							0
Number of significant portfolio companies, controlling interest | company	2		2	2		2
Second lien
Schedule of Investments [Line Items]
Fair Value Percentage of Net Assets	4.60%			4.60%							6.20%
Common
Schedule of Investments [Line Items]
Fair Value Percentage of Net Assets	69.60%			69.60%							64.00%
Milton Industries Inc
Schedule of Investments [Line Items]
Fair Value	$ 2,300			$ 2,300
Total Senior Secured Notes
Schedule of Investments [Line Items]
Amortized Cost	319,611	[1],[2],[3]		319,611	[1],[2],[3]						$ 292,284	[4],[5],[6]
Fair Value	$ 319,793	[1],[2],[3]		$ 319,793	[1],[2],[3]						$ 292,284	[4],[5],[6]
Weighted average yield on debt investments (as a percent)	13.90%			13.90%
Weighted average years to maturity (in years)	4 years 3 months 18 days			4 years 3 months 18 days
International Franchise Professionals Group
Schedule of Investments [Line Items]
Amortized Cost	$ 113,500			$ 113,500
Fair Value Percentage of Net Assets	91.00%			91.00%
International Franchise Professionals Group | Equity Securities
Schedule of Investments [Line Items]
Amortized Cost	$ 90,500			$ 90,500
International Franchise Professionals Group | Senior Subordinated Notes
Schedule of Investments [Line Items]
Amortized Cost	$ 23,000			$ 23,000
Madison Retirement Holdings TopCo, LLC
Schedule of Investments [Line Items]
Amortized Cost										$ 4,000
Clarion Safety Systems, LLC
Schedule of Investments [Line Items]
Amortized Cost									$ 13,500
LOCI Topco Limited
Schedule of Investments [Line Items]
Amortized Cost								$ 25,800
SDC Strategic Capital EquityCo, LLC and SDC Strategic Capital DebtCo, LLC
Schedule of Investments [Line Items]
Amortized Cost							$ 7,500
SDC Strategic Capital EquityCo, LLC | Common
Schedule of Investments [Line Items]
Amortized Cost							6,800
SDC Strategic Capital DebtCo, LLC | Second lien
Schedule of Investments [Line Items]
Amortized Cost							$ 700

[1] All investments are US based unless otherwise noted.

[2] Percentages represent fair value as a percentage of net assets for each investment category.

[3] Security may be an obligation of one or more entities affiliated with the named company.

[4] All investments are US based unless otherwise noted.

[5] Percentages represent fair value as a percentage of net assets for each investment category.

[6] Security may be an obligation of one or more entities affiliated with the named company.