Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended				48 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2021
Related Party Transaction [Line Items]
Expiration period	3 years
Expense support	$ 0	$ (3,301,473)
Expense support reimbursable	(1,800,000)				$ (1,800,000)
Reimbursement of expense support	1,830,920	0			1,830,920
Distributions paid	10,765,618	7,395,691
Manager and Sub-Manager
Related Party Transaction [Line Items]
Organization and offering costs incurred	$ 4,200,000
Annual preference return relates to non-founder shares	8.75%
Annual preference return relates to founder shares	7.777%
Distributions paid	$ 700,000	700,000
Organization and offering reimbursement | Manager and Sub-Manager
Related Party Transaction [Line Items]
Related party fees and expenses	$ 2,490,377	1,142,237
Manager Sub Manager
Related Party Transaction [Line Items]
Percentage of return incentive fees payable	50.00%
Base management fees multiplier for non founder shares	2.00%
Base management fees multiplier for founder shares	1.00%
Annual preference return	7.00%
Annual preference return relates to non-founder shares	8.75%
Annual preference return relates to founder shares	7.777%
Expense support	$ (3,301,473)		$ (1,372,020)	$ (389,774)	$ (5,063,267)
Base management fees | Manager and Sub-Manager
Related Party Transaction [Line Items]
Related party fees and expenses	4,845,052	2,596,842
Return incentive fees | Manager and Sub-Manager
Related Party Transaction [Line Items]
Related party fees and expenses	7,282,840	4,150,562
Expense Support and Conditional Reimbursement Agreement: Expense support
Related Party Transaction [Line Items]
Reimbursement of expense support	1,830,920	0
Expense Support and Conditional Reimbursement Agreement: Expense support | Manager and Sub-Manager
Related Party Transaction [Line Items]
Related party fees and expenses	$ 0	$ (3,301,473)
Manager and Sub-Manager
Related Party Transaction [Line Items]
Shares outstanding end of period (in shares)	400,000	600,000			400,000
Minimum | Manager and Sub-Manager
Related Party Transaction [Line Items]
Annual preference return	7.00%
Proceeds from Public Offering | Manager and Sub-Manager
Related Party Transaction [Line Items]
Maximum percentage of reimbursement from private placement	1.50%
Private Placement | Manager and Sub-Manager
Related Party Transaction [Line Items]
Maximum percentage of reimbursement from private placement	1.00%
Class A
Related Party Transaction [Line Items]
Shares outstanding end of period (in shares)	1,461,000	1,034,000			1,461,000
Class A | Managing Dealer /Placement Agent
Related Party Transaction [Line Items]
Selling commission on share sold percentage	6.00%				6.00%
Class A | Proceeds from Public Offering
Related Party Transaction [Line Items]
Dealer manager fee	2.50%				2.50%
Class T
Related Party Transaction [Line Items]
Shares outstanding end of period (in shares)	1,609,000	655,000			1,609,000
Class T | Managing Dealer /Placement Agent
Related Party Transaction [Line Items]
Selling commission on share sold percentage	3.00%				3.00%
Class T | Proceeds from Public Offering
Related Party Transaction [Line Items]
Dealer manager fee	1.75%				1.75%
Annual distribution and fee, percentage	1.00%				1.00%
Class FA
Related Party Transaction [Line Items]
Shares outstanding end of period (in shares)	4,559,000	4,579,000			4,559,000
Class FA | Follow On Private Placement
Related Party Transaction [Line Items]
Selling commission on share sold percentage	5.50%		5.50%		5.50%
Placement agent fee on share sold percentage	3.00%		3.00%
Class D
Related Party Transaction [Line Items]
Shares outstanding end of period (in shares)	1,009,000	454,000			1,009,000
Class D | Proceeds from Public Offering
Related Party Transaction [Line Items]
Annual distribution and fee, percentage	0.50%				0.50%
Class S
Related Party Transaction [Line Items]
Shares outstanding end of period (in shares)	1,766,000	1,770,000			1,766,000
Class S | Class S Private Offering
Related Party Transaction [Line Items]
Selling commission on share sold percentage	2.00%	2.00%			2.00%
Placement agent fee on share sold percentage	1.50%	1.50%
Annual Preference Return Less than or Equal to 8.75% or the Non-founder breakpoint | Manager Sub Manager
Related Party Transaction [Line Items]
Percentage of return incentive fees payable	20.00%
Annual Preference Return Less Than 7.777% or Founder breakpoint | Manager Sub Manager
Related Party Transaction [Line Items]
Percentage of return incentive fees payable	10.00%