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Related Party Transactions - Summary of Fees and Expenses Incurred and Amounts of Investment Funding Due (Parenthetical) (Detail) - USD ($)
9 Months Ended 12 Months Ended
Mar. 26, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]        
Due to related parties   $ 1,816,091 $ 1,438,450 $ 2,057,181
Organization and offering costs incurred by advisor on behalf of Company   $ 11,030,568 $ 9,946,509  
Percentage of organization and offering costs to gross offering proceeds   1.00% 1.00%  
Unreimbursed Operating Expenses [Member] | Advisor [Member]        
Related Party Transaction [Line Items]        
Due to related parties   $ 12,066,637 $ 10,038,966  
Fees and expenses, Incurred   2,027,671 2,594,741  
Organization And Offering Costs Payable [Member] | Advisor [Member]        
Related Party Transaction [Line Items]        
Due to related parties   $ 68,260 $ 312,284  
Demand Note [Member] | Summerfield MT Joint Venture [Member]        
Related Party Transaction [Line Items]        
Principal amount $ 720,000      
Interest payment $ 0      
Principal due period 5 days