Fair Value - Summary of Quantitative Information About The Company's Level 3 Asset Fair Value Measurements (Detail) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Bank Debt/Senior Secured Loans | Valuation, Income Approach [Member] | Measurement Input Market Yield [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, Fair Value Disclosure	$ 406,543	$ 532,753
Common Equity/Equity Interests/Warrants | Measurement Ebitda Multiple | Measurement Input Comparable Multiple [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, Fair Value Disclosure	13,958
Common Equity/Equity Interests/Warrants | Valuation, Market Approach [Member] | Measurement Input, Price Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, Fair Value Disclosure	$ 17	$ 60
Minimum [Member] | Bank Debt/Senior Secured Loans | Valuation, Income Approach [Member] | Measurement Input Market Yield [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	10	9.4
Minimum [Member] | Common Equity/Equity Interests/Warrants | Measurement Ebitda Multiple | Measurement Input Comparable Multiple [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	5.5
Minimum [Member] | Common Equity/Equity Interests/Warrants | Valuation, Market Approach [Member] | Measurement Input, Price Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	18.9	26
Maximum [Member] | Bank Debt/Senior Secured Loans | Valuation, Income Approach [Member] | Measurement Input Market Yield [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	17.6	16.2
Maximum [Member] | Common Equity/Equity Interests/Warrants | Measurement Ebitda Multiple | Measurement Input Comparable Multiple [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	6.5
Maximum [Member] | Common Equity/Equity Interests/Warrants | Valuation, Market Approach [Member] | Measurement Input, Price Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	18.9	26
Weighted Average [Member] | Bank Debt/Senior Secured Loans | Valuation, Income Approach [Member] | Measurement Input Market Yield [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	12.2	11.4
Weighted Average [Member] | Common Equity/Equity Interests/Warrants | Measurement Ebitda Multiple | Measurement Input Comparable Multiple [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	6
Weighted Average [Member] | Common Equity/Equity Interests/Warrants | Valuation, Market Approach [Member] | Measurement Input, Price Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	18.9	26