Investments - Industry and Geographic Dispersion of Investment Portfolio as Percentage of Total Fair Value of Investments (Detail)	Dec. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Percentage of total fair value of investment	100.00%	100.00%
Real Estate Services
Investment Holdings [Line Items]
Percentage of total fair value of investment	17.20%	0.00%
Commercial and Professional Services
Investment Holdings [Line Items]
Percentage of total fair value of investment	15.80%	27.50%
Visual Safety Solutions
Investment Holdings [Line Items]
Percentage of total fair value of investment	15.20%	0.00%
Information Services and Advisory Solutions
Investment Holdings [Line Items]
Percentage of total fair value of investment	12.10%	22.30%
Sanitation Products
Investment Holdings [Line Items]
Percentage of total fair value of investment	11.10%	0.00%
Healthcare Supplies
Investment Holdings [Line Items]
Percentage of total fair value of investment	10.60%	18.40%
Hobby Goods and Supplies
Investment Holdings [Line Items]
Percentage of total fair value of investment	8.70%	15.20%
Engineered Products
Investment Holdings [Line Items]
Percentage of total fair value of investment	2.80%	10.80%
Business Services
Investment Holdings [Line Items]
Percentage of total fair value of investment	6.50%	5.80%