Financial Highlights - Schedule of Financial Highlights (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2022		Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021		Jun. 30, 2021	Dec. 31, 2020
OPERATING PERFORMANCE PER SHARE
Reimbursement of expense support	$ 183		$ 1,055	$ 2,535		$ 1,055
Net investment income (usd per share)	$ 0.25		$ 0.16	$ 0.69		$ 0.58
Net assets, end of period	$ 642,668	[1],[2]	$ 448,968	$ 642,668	[1],[2]	$ 448,968	$ 583,444	$ 500,309	[3],[4]	$ 404,067	$ 308,962
Distributions declared	$ 5,627		$ 4,037	$ 15,814		$ 10,945
Class FA
OPERATING PERFORMANCE PER SHARE
Net Asset Value, Beginning of Period (usd per share)				$ 32.62		$ 29.97
Net investment income, before expense support (usd per shares)				1.26		0.97
Reimbursement of Expense Support (usd per share)				(0.33)		(0.17)
Net investment income (usd per share)				0.93		0.80
Net realized and unrealized gains (usd per share)				1.54		2.61
Net increase resulting from investment operations (usd per share)				2.47		3.41
Distributions to shareholders (usd per share)				(0.94)		(0.94)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.94)		(0.94)
Net Asset Value, End of Period (usd per shares)	$ 34.15		$ 32.44	$ 34.15		$ 32.44
Net assets, end of period	$ 145,589		$ 147,969	$ 145,589		$ 147,969		148,717
Average net assets				$ 146,998		$ 144,325
Shares outstanding end of period (in shares)	4,263		4,561	4,263		4,561
Distributions declared				$ 4,143		$ 4,289
Total investment return based on net asset value before total return incentive fee (in percent)				8.52%		12.76%
Total investment return based on net asset value after total return incentive fee (in percent)				7.52%		11.33%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				1.00%		1.15%
Total operating expenses before reimbursement of Expense Support (in percent)				1.83%		2.35%
Total operating expenses after reimbursement of Expense Support (in percent)				2.81%		2.90%
Net investment income before total return incentive fee (in percent)				3.63%		3.74%
Net investment income (in percent)				2.80%		2.54%
Class A
OPERATING PERFORMANCE PER SHARE
Net Asset Value, Beginning of Period (usd per share)				$ 30.78		$ 28.76
Net investment income, before expense support (usd per shares)				0.68		0.38
Reimbursement of Expense Support (usd per share)				(0.16)		(0.03)
Net investment income (usd per share)				0.52		0.35
Net realized and unrealized gains (usd per share)				1.56		2.63
Net increase resulting from investment operations (usd per share)				2.08		2.98
Distributions to shareholders (usd per share)				(0.94)		(0.94)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.94)		(0.94)
Net Asset Value, End of Period (usd per shares)	$ 31.92		$ 30.80	$ 31.92		$ 30.80
Net assets, end of period	$ 64,443		$ 41,851	$ 64,443		$ 41,851		44,958
Average net assets				$ 52,817		$ 35,346
Shares outstanding end of period (in shares)	2,019		1,359	2,019		1,359
Distributions declared				$ 1,580		$ 1,095
Total investment return based on net asset value before total return incentive fee (in percent)				8.33%		12.72%
Total investment return based on net asset value after total return incentive fee (in percent)				6.85%		10.48%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				2.43%		2.37%
Total operating expenses before reimbursement of Expense Support (in percent)				4.13%		4.78%
Total operating expenses after reimbursement of Expense Support (in percent)				4.65%		4.88%
Net investment income before total return incentive fee (in percent)				3.35%		3.56%
Net investment income (in percent)				1.65%		1.15%
Class T
OPERATING PERFORMANCE PER SHARE
Net Asset Value, Beginning of Period (usd per share)				$ 30.66		$ 28.67
Net investment income, before expense support (usd per shares)				0.47		0.23
Reimbursement of Expense Support (usd per share)				0		(0.16)
Net investment income (usd per share)				0.47		0.07
Net realized and unrealized gains (usd per share)				1.55		2.66
Net increase resulting from investment operations (usd per share)				2.02		2.73
Distributions to shareholders (usd per share)				(0.75)		(0.75)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.75)		(0.75)
Net Asset Value, End of Period (usd per shares)	$ 31.93		$ 30.65	$ 31.93		$ 30.65
Net assets, end of period	$ 67,539		$ 39,665	$ 67,539		$ 39,665		49,328
Average net assets				$ 56,318		$ 25,327
Shares outstanding end of period (in shares)	2,115		1,294	2,115		1,294
Distributions declared				$ 1,349		$ 628
Total investment return based on net asset value before total return incentive fee (in percent)				8.14%		11.08%
Total investment return based on net asset value after total return incentive fee (in percent)				6.67%		9.61%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				3.13%		3.94%
Total operating expenses before reimbursement of Expense Support (in percent)				4.79%		6.04%
Total operating expenses after reimbursement of Expense Support (in percent)				4.79%		6.58%
Net investment income before total return incentive fee (in percent)				3.16%		2.34%
Net investment income (in percent)				1.50%		0.24%
Class D
OPERATING PERFORMANCE PER SHARE
Net Asset Value, Beginning of Period (usd per share)				$ 30.35		$ 28.24
Net investment income, before expense support (usd per shares)				0.54		0.37
Reimbursement of Expense Support (usd per share)				0		(0.16)
Net investment income (usd per share)				0.54		0.21
Net realized and unrealized gains (usd per share)				1.54		2.66
Net increase resulting from investment operations (usd per share)				2.08		2.87
Distributions to shareholders (usd per share)				(0.84)		(0.84)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.84)		(0.84)
Net Asset Value, End of Period (usd per shares)	$ 31.59		$ 30.27	$ 31.59		$ 30.27
Net assets, end of period	$ 52,356		$ 27,652	$ 52,356		$ 27,652		30,607
Average net assets				$ 38,532		$ 17,260
Shares outstanding end of period (in shares)	1,657		914	1,657		914
Distributions declared				$ 1,048		$ 487
Total investment return based on net asset value before total return incentive fee (in percent)				8.34%		11.80%
Total investment return based on net asset value after total return incentive fee (in percent)				6.96%		10.29%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				3.09%		3.54%
Total operating expenses before reimbursement of Expense Support (in percent)				4.85%		5.74%
Total operating expenses after reimbursement of Expense Support (in percent)				4.85%		6.27%
Net investment income before total return incentive fee (in percent)				3.50%		2.90%
Net investment income (in percent)				1.74%		0.70%
Class I
OPERATING PERFORMANCE PER SHARE
Net Asset Value, Beginning of Period (usd per share)				$ 31.18		$ 29.06
Net investment income, before expense support (usd per shares)				0.65		0.37
Reimbursement of Expense Support (usd per share)				(0.12)		0
Net investment income (usd per share)				0.53		0.37
Net realized and unrealized gains (usd per share)				1.58		2.69
Net increase resulting from investment operations (usd per share)				2.11		3.06
Distributions to shareholders (usd per share)				(0.94)		(0.94)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.94)		(0.94)
Net Asset Value, End of Period (usd per shares)	$ 32.35		$ 31.18	$ 32.35		$ 31.18
Net assets, end of period	$ 251,558		$ 134,054	$ 251,558		$ 134,054		168,704
Average net assets				$ 204,736		$ 91,833
Shares outstanding end of period (in shares)	7,777		4,299	7,777		4,299
Distributions declared				$ 6,039		$ 2,786
Total investment return based on net asset value before total return incentive fee (in percent)				8.32%		12.38%
Total investment return based on net asset value after total return incentive fee (in percent)				6.86%		10.65%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				2.51%		3.12%
Total operating expenses before reimbursement of Expense Support (in percent)				4.20%		5.47%
Total operating expenses after reimbursement of Expense Support (in percent)				4.60%		5.41%
Net investment income before total return incentive fee (in percent)				3.35%		3.51%
Net investment income (in percent)				1.67%		1.22%
Class S
OPERATING PERFORMANCE PER SHARE
Net Asset Value, Beginning of Period (usd per share)				$ 32.84		$ 30.08
Net investment income, before expense support (usd per shares)				1.20		0.89
Reimbursement of Expense Support (usd per share)				0		0
Net investment income (usd per share)				1.20		0.89
Net realized and unrealized gains (usd per share)				1.56		2.61
Net increase resulting from investment operations (usd per share)				2.76		3.50
Distributions to shareholders (usd per share)				(0.94)		(0.94)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.94)		(0.94)
Net Asset Value, End of Period (usd per shares)	$ 34.66		$ 32.64	$ 34.66		$ 32.64
Net assets, end of period	$ 61,183		$ 57,778	$ 61,183		$ 57,778		$ 57,995
Average net assets				$ 59,389		$ 56,108
Shares outstanding end of period (in shares)	1,765		1,770	1,765		1,770
Distributions declared				$ 1,655		$ 1,660
Total investment return based on net asset value before total return incentive fee (in percent)				9.48%		13.10%
Total investment return based on net asset value after total return incentive fee (in percent)				8.52%		11.77%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				1.13%		1.37%
Total operating expenses before reimbursement of Expense Support (in percent)				2.04%		2.60%
Total operating expenses after reimbursement of Expense Support (in percent)				2.04%		2.60%
Net investment income before total return incentive fee (in percent)				4.49%		4.04%
Net investment income (in percent)				3.58%		2.81%

[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.

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

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