Investments - Industry and Geographic Dispersion of Investment Portfolio as Percentage of Total Fair Value of Investments (Detail)	Sep. 30, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Percentage of total fair value of investment	100.00%	100.00%
Engineered Products
Investment Holdings [Line Items]
Percentage of total fair value of investment	17.30%	2.80%
Commercial and Professional Services
Investment Holdings [Line Items]
Percentage of total fair value of investment	13.60%	15.80%
Real Estate Services
Investment Holdings [Line Items]
Percentage of total fair value of investment	13.30%	17.20%
Visual Safety Solutions
Investment Holdings [Line Items]
Percentage of total fair value of investment	13.10%	15.20%
Information Services and Advisory Solutions
Investment Holdings [Line Items]
Percentage of total fair value of investment	10.30%	12.10%
Healthcare Supplies
Investment Holdings [Line Items]
Percentage of total fair value of investment	9.70%	10.60%
Sanitation Products
Investment Holdings [Line Items]
Percentage of total fair value of investment	8.80%	11.10%
Hobby Goods and Supplies
Investment Holdings [Line Items]
Percentage of total fair value of investment	7.20%	8.70%
Business Services
Investment Holdings [Line Items]
Percentage of total fair value of investment	6.70%	6.50%