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Related Party Transactions - Summary of Related Party Costs - Related Party Transactions (Parenthetical) (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jul. 10, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]        
Liability for future payment   $ 9,661,657   $ 9,043,433
Reduction in due to affiliates   $ (618,224) $ (495,291)  
Primary Offering And Termination of Dealer Manager [Member]        
Related Party Transaction [Line Items]        
Reduction in due to affiliates       $ 600,000
Primary Offering And Termination of Dealer Manager [Member] | Minimum [Member]        
Related Party Transaction [Line Items]        
Underwriting compensation   10.00%    
Percentage of organization and offering expenses expected at termination of public offering   1.00%    
Percentage of receivable from advisor for organization and offering expenses incurred       1.00%
Stockholder Servicing Fees and Dealer Manager Servicing Fees [Member]        
Related Party Transaction [Line Items]        
Liability for future payment   $ 0    
Advisor Funding Agreement [Member]        
Related Party Transaction [Line Items]        
Maximum period for reimbursement of offering expenses 60 days 60 days    
Advisor Funding Agreement [Member] | Minimum [Member]        
Related Party Transaction [Line Items]        
Percentage of organization and offering expenses funded by our advisor 1.00% 1.00%    
Advisor Funding Agreement [Member] | Maximum [Member]        
Related Party Transaction [Line Items]        
Percentage of organization and offering expenses funded by our advisor 1.00% 1.00%    
Class Y and Z Common Stock [Member] | Minimum [Member]        
Related Party Transaction [Line Items]        
Percentage of organization and offering expenses funded by our advisor   1.00%    
Class Y and Z Common Stock [Member] | Primary Offering And Termination of Dealer Manager [Member] | Minimum [Member]        
Related Party Transaction [Line Items]        
Percentage of organization and offering expenses expected at termination of public offering   1.00%   1.00%
Class Y and Z Common Stock [Member] | Advisor Funding Agreement [Member]        
Related Party Transaction [Line Items]        
Reimbursement of offering cost rate   1.00%    
Select Capital Corporation (Dealer Manager) [Member]        
Related Party Transaction [Line Items]        
Underwriting compensation   10.00%    
Select Capital Corporation (Dealer Manager) [Member] | Class T and Y Common Stock [Member] | Additional Paid In Capital Selling Commissions [Member]        
Related Party Transaction [Line Items]        
Monthly stockholder servicing fee accrual description   accrued daily in an amount equal to 1/365th of 1% of the purchase price per share    
Select Capital Corporation (Dealer Manager) [Member] | Class W and Z Common Stock [Member] | Additional Paid In Capital Selling Commissions [Member]        
Related Party Transaction [Line Items]        
Monthly stockholder servicing fee accrual description   accrued daily in an amount equal to 1/365th of 0.5% of the purchase price per share    
Monthly stockholder servicing fee accrual description   accrued daily in an amount equal to 1/365th of 0.5% of the purchase price per share