Fair Value of Financial Instruments - Unobservable Inputs Used in Fair Value Measurement of Investments (Detail) $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 633,001	$ 455,997	[1],[2]
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	572,926	455,997
Discounted Cash Flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Senior secured debt	176,942	130,042
Equity	$ 395,984	256,695
Transaction Precedent | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Senior secured debt		22,500
Equity		$ 46,760
Minimum | Discounted Cash Flow | Discount Rate | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	0.100	0.085
Measurement input, Equity Securities	0.100	0.085
Minimum | Market Comparables | EBITDA Multiple | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	6.6	4.1
Measurement input, Equity Securities	6.6	4.1
Minimum | Transaction Method | EBITDA Multiple | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	6.5	6.0
Measurement input, Equity Securities	6.5	6.0
Maximum | Discounted Cash Flow | Discount Rate | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	0.140	0.130
Measurement input, Equity Securities	0.140	0.130
Maximum | Market Comparables | EBITDA Multiple | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	13.6	15.2
Measurement input, Equity Securities	13.6	15.2
Maximum | Transaction Method | EBITDA Multiple | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	12.5	12.5
Measurement input, Equity Securities	12.5	12.5
Weighted Average | Discounted Cash Flow | Discount Rate | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	0.118	0.114
Measurement input, Equity Securities	0.118	0.114
Weighted Average | Market Comparables | EBITDA Multiple | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	9.7	8.9
Measurement input, Equity Securities	9.7	8.9
Weighted Average | Transaction Method | EBITDA Multiple | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input, Debt securities	10.8	9.6
Measurement input, Equity Securities	10.8	9.6

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

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