Capital Transactions -Additional Information (Detail)			3 Months Ended		6 Months Ended
	Nov. 01, 2021 USD ($)	Mar. 07, 2018 USD ($)	Jun. 30, 2022 USD ($) $ / shares	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2022 USD ($) classOfStock $ / shares shares	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)
Investment Company, Capital Share Transactions [Line Items]
Authorized amount per quarter (in percent)					2.50%
Authorized amount per year (in percent)					10.00%
Repurchase of common shares pursuant to share repurchase program			$ 10,813,000	$ 877,000	$ 16,052,000	$ 2,088,000
Amount of share requested to be repurchased in excess of proceeds received from its distribution reinvestment plan					13,000,000	600,000
Payable for shares repurchased			$ 10,813,000	$ 878,000	$ 10,813,000	$ 878,000	$ 509,000
Stock converted (in shares) | shares						0
Average Net Proceeds per Share | $ / shares			$ 31.36	$ 30.11	$ 31.36	$ 30.11
Number of classes of stock | classOfStock					4
Class A
Investment Company, Capital Share Transactions [Line Items]
Repurchase of common shares pursuant to share repurchase program					$ 592,000	$ 510,000
Conversion of stock (in shares) | shares					19,343	0
Conversion rate (as a percent)					100.00%
Average Net Proceeds per Share | $ / shares			31.15	29.73	$ 31.15	$ 29.73
Class T
Investment Company, Capital Share Transactions [Line Items]
Repurchase of common shares pursuant to share repurchase program					$ 157,000	$ 473,000
Stock converted (in shares) | shares					(19,400)
Average Net Proceeds per Share | $ / shares			31.14	29.77	$ 31.14	$ 29.77
Class D
Investment Company, Capital Share Transactions [Line Items]
Repurchase of common shares pursuant to share repurchase program					$ 423,000	$ 142,000
Average Net Proceeds per Share | $ / shares			30.78	29.52	$ 30.78	$ 29.52
Class I
Investment Company, Capital Share Transactions [Line Items]
Repurchase of common shares pursuant to share repurchase program					$ 5,486,000	$ 644,000
Average Net Proceeds per Share | $ / shares			31.57	$ 30.27	$ 31.57	$ 30.27
Public Offering
Investment Company, Capital Share Transactions [Line Items]
Shares offered (in shares)		$ 1,000,000,000
Sale of stock offering, minimum requirement (in shares)		5,000
Number of classes of stock | classOfStock					4
Public Offering | Class A
Investment Company, Capital Share Transactions [Line Items]
Share price (usd per share) | $ / shares			34.26		$ 34.26
Public Offering | Class T
Investment Company, Capital Share Transactions [Line Items]
Share price (usd per share) | $ / shares			32.82		32.82
Public Offering | Class D
Investment Company, Capital Share Transactions [Line Items]
Share price (usd per share) | $ / shares			30.95		30.95
Public Offering | Class I
Investment Company, Capital Share Transactions [Line Items]
Share price (usd per share) | $ / shares			$ 31.79		$ 31.79
Distribution Reinvestment Plan
Investment Company, Capital Share Transactions [Line Items]
Shares offered (in shares)	$ 100,000,000	$ 100,000,000			$ 100,000,000