Financial Highlights - Schedule of Financial Highlights (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021		Mar. 31, 2021	Dec. 31, 2020
OPERATING PERFORMANCE PER SHARE
Net investment income (usd per share)	$ 0.20		$ 0.20	$ 0.44		$ 0.43
Net assets, end of period	$ 583,444	[1],[2]	$ 404,067	$ 583,444	[1],[2]	$ 404,067	$ 541,710	$ 500,309	[3],[4]	$ 346,477	$ 308,962
Distributions declared	$ 5,259		$ 3,618	$ 10,187		$ 6,908
Ratios to average net assets:
Total investment return based on net asset value after total return incentive fee (in percent)				0.00%
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)				0.85		0.30
Reimbursement of Expense Support (usd per share)				(0.29)
Expense support (usd per share)						0.25
Net investment income (usd per share)				0.56		0.55
Net realized and unrealized gains (usd per share)				0.99		2.51
Net increase resulting from investment operations (usd per share)				1.55		3.06
Distributions from net investment income (usd per share)				(0.63)		(0.63)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.63)		(0.63)
Net Asset Value, End of Period (usd per shares)	$ 33.54		$ 32.40	$ 33.54		$ 32.40
Net assets, end of period	$ 143,454		$ 148,004	$ 143,454		$ 148,004		148,717
Average net assets				$ 148,510		$ 142,413
Shares outstanding end of period (in shares)	4,277		4,569	4,277		4,569
Distributions declared				$ 2,806		$ 2,861
Total investment return based on net asset value before total return incentive fee (in percent)				5.31%		10.40%
Total investment return based on net asset value after total return incentive fee (in percent)				4.68%		10.20%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				0.68%		0.81%
Total operating expenses before reimbursement of Expense Support (in percent)				1.19%		1.81%
Total operating expenses after reimbursement of Expense Support (in percent)				2.06%		0.98%
Net investment income before total return incentive fee (in percent)				2.20%		1.95%
Net investment income (in percent)				1.69%		1.77%
Total investment return based on net asset value after total return incentive fee (in percent)						83.00%
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)				0.49		(0.18)
Reimbursement of Expense Support (usd per share)				(0.18)
Expense support (usd per share)						0.46
Net investment income (usd per share)				0.31		0.28
Net realized and unrealized gains (usd per share)				1.00		2.51
Net increase resulting from investment operations (usd per share)				1.31		2.79
Distributions from net investment income (usd per share)				(0.63)		(0.63)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.63)		(0.63)
Net Asset Value, End of Period (usd per shares)	$ 31.46		$ 30.92	$ 31.46		$ 30.92
Net assets, end of period	$ 55,433		$ 37,938	$ 55,433		$ 37,938		44,958
Average net assets				$ 49,761		$ 33,429
Shares outstanding end of period (in shares)	1,762		1,227	1,762		1,227
Distributions declared				$ 997		$ 699
Total investment return based on net asset value before total return incentive fee (in percent)				5.25%		10.22%
Total investment return based on net asset value after total return incentive fee (in percent)				4.27%		9.79%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				1.59%		1.61%
Total operating expenses before reimbursement of Expense Support (in percent)				2.64%		3.60%
Total operating expenses after reimbursement of Expense Support (in percent)				3.20%		2.04%
Net investment income before total return incentive fee (in percent)				2.05%		1.37%
Net investment income (in percent)				1.00%		0.95%
Total investment return based on net asset value after total return incentive fee (in percent)						79.00%
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)				0.33		(0.35)
Reimbursement of Expense Support (usd per share)				0
Expense support (usd per share)						0.38
Net investment income (usd per share)				0.33		0.03
Net realized and unrealized gains (usd per share)				0.98		2.53
Net increase resulting from investment operations (usd per share)				1.31		2.56
Distributions from net investment income (usd per share)				(0.50)		(0.50)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.50)		(0.50)
Net Asset Value, End of Period (usd per shares)	$ 31.47		$ 30.73	$ 31.47		$ 30.73
Net assets, end of period	$ 61,152		$ 28,029	$ 61,152		$ 28,029		49,328
Average net assets				$ 52,814		$ 22,268
Shares outstanding end of period (in shares)	1,943		912	1,943		912
Distributions declared				$ 849		$ 373
Total investment return based on net asset value before total return incentive fee (in percent)				5.27%		9.50%
Total investment return based on net asset value after total return incentive fee (in percent)				4.30%		9.01%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				2.10%		2.43%
Total operating expenses before reimbursement of Expense Support (in percent)				3.17%		4.31%
Total operating expenses after reimbursement of Expense Support (in percent)				3.17%		3.03%
Net investment income before total return incentive fee (in percent)				2.14%		0.70%
Net investment income (in percent)				1.06%		0.10%
Total investment return based on net asset value after total return incentive fee (in percent)						68.00%
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)				0.38		(0.27)
Reimbursement of Expense Support (usd per share)				0
Expense support (usd per share)						0.42
Net investment income (usd per share)				0.38		0.15
Net realized and unrealized gains (usd per share)				0.98		2.52
Net increase resulting from investment operations (usd per share)				1.36		2.67
Distributions from net investment income (usd per share)				(0.56)		(0.56)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.56)		(0.56)
Net Asset Value, End of Period (usd per shares)	$ 31.15		$ 30.35	$ 31.15		$ 30.35
Net assets, end of period	$ 42,574		$ 18,921	$ 42,574		$ 18,921		30,607
Average net assets				$ 35,100		$ 14,736
Shares outstanding end of period (in shares)	1,367		624	1,367		624
Distributions declared				$ 641		$ 282
Total investment return based on net asset value before total return incentive fee (in percent)				5.50%		10.03%
Total investment return based on net asset value after total return incentive fee (in percent)				4.53%		9.56%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				2.02%		2.13%
Total operating expenses before reimbursement of Expense Support (in percent)				3.15%		4.11%
Total operating expenses after reimbursement of Expense Support (in percent)				3.15%		2.68%
Net investment income before total return incentive fee (in percent)				2.38%		1.05%
Net investment income (in percent)				1.25%		0.50%
Total investment return based on net asset value after total return incentive fee (in percent)						72.00%
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)				0.46		(0.32)
Reimbursement of Expense Support (usd per share)				(0.13)
Expense support (usd per share)						0.64
Net investment income (usd per share)				0.33		0.32
Net realized and unrealized gains (usd per share)				1.01		2.53
Net increase resulting from investment operations (usd per share)				1.34		2.85
Distributions from net investment income (usd per share)				(0.63)		(0.63)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.63)		(0.63)
Net Asset Value, End of Period (usd per shares)	$ 31.89		$ 31.28	$ 31.89		$ 31.28
Net assets, end of period	$ 220,797		$ 113,537	$ 220,797		$ 113,537		168,704
Average net assets				$ 191,764		$ 77,410
Shares outstanding end of period (in shares)	6,924		3,629	6,924		3,629
Distributions declared				$ 3,790		$ 1,586
Total investment return based on net asset value before total return incentive fee (in percent)				5.27%		9.90%
Total investment return based on net asset value after total return incentive fee (in percent)				4.32%		9.90%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				1.70%		2.37%
Total operating expenses before reimbursement of Expense Support (in percent)				2.75%		4.34%
Total operating expenses after reimbursement of Expense Support (in percent)				3.16%		2.23%
Net investment income before total return incentive fee (in percent)				2.10%		1.05%
Net investment income (in percent)				1.04%		1.05%
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)				0.81		0.23
Reimbursement of Expense Support (usd per share)				0
Expense support (usd per share)						0.38
Net investment income (usd per share)				0.81		0.61
Net realized and unrealized gains (usd per share)				0.99		2.50
Net increase resulting from investment operations (usd per share)				1.80		3.11
Distributions from net investment income (usd per share)				(0.63)		(0.63)
Net Decrease Resulting From Distributions to Shareholders (usd per share)				(0.63)		(0.63)
Net Asset Value, End of Period (usd per shares)	$ 34.01		$ 32.56	$ 34.01		$ 32.56
Net assets, end of period	$ 60,034		$ 57,639	$ 60,034		$ 57,639		$ 57,995
Average net assets				$ 58,971		$ 55,304
Shares outstanding end of period (in shares)	1,765		1,770	1,765		1,770
Distributions declared				$ 1,104		$ 1,107
Total investment return based on net asset value before total return incentive fee (in percent)				6.13%		10.43%
Total investment return based on net asset value after total return incentive fee (in percent)				5.51%		10.43%
Ratios to average net assets:
Total operating expenses before total return incentive fee (in percent)				0.77%		1.01%
Total operating expenses before reimbursement of Expense Support (in percent)				1.37%		2.00%
Total operating expenses after reimbursement of Expense Support (in percent)				1.37%		0.79%
Net investment income before total return incentive fee (in percent)				3.02%		1.96%
Net investment income (in percent)				2.42%		1.96%
Common Class I and Class S
Ratios to average net assets:
Total investment return based on net asset value after total return incentive fee (in percent)						100.00%

[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.