Fair Value Measurements - Summary of Quantitative Information of Fair Value Measurements of Investments (Parenthetical) (Detail) - Level 3 [Member] - Senior Secured Trade Finance Participations One [Member]		6 Months Ended	12 Months Ended
		Jun. 30, 2022	Dec. 31, 2021
Minimum [Member] | Income Approach (DCF) and Collateral Based Approach [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Expected collection period		2 years
Minimum [Member] | Income Approach (DCF) and Collateral Based Approach [Member] | Recovery Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Additional unobservable inputs		0.15
Minimum [Member] | Income Approach (DCF) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Expected collection period			2 years
Minimum [Member] | Income Approach (DCF) [Member] | Recovery Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Additional unobservable inputs			0.15
Minimum [Member] | Income Approach (DCF) [Member] | Measurement Input, Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Additional unobservable inputs	[1],[2]	12	11.0
Maximum [Member] | Income Approach (DCF) and Collateral Based Approach [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Expected collection period		3 years
Maximum [Member] | Income Approach (DCF) and Collateral Based Approach [Member] | Recovery Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Additional unobservable inputs		0.30
Maximum [Member] | Income Approach (DCF) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Expected collection period			3 years
Maximum [Member] | Income Approach (DCF) [Member] | Recovery Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Additional unobservable inputs			0.30
Maximum [Member] | Income Approach (DCF) [Member] | Measurement Input, Discount Rate [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Additional unobservable inputs	[1],[2]	15.75	15.75

[1] The Company used the income approach for the following Watch List investments: CAGSA, Triton, MICD and Itelecom and a hybrid of the collateral based approach and the income approach for TRG Cape Verde, Helios Martime, Producam, Applewood and Usivale, using additional unobservable inputs including recovery rates ranging from 15% to 30%, after considering potential and ongoing litigation and expected collection period ranging from 2 to 3 years. See Note 3 “Watch List Investments” for further information.

[2] The inputs were weighted based on the fair value of the investments included in the range.