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Organization - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 26, 2021
$ / shares
Sep. 30, 2021
USD ($)
Property
$ / shares
Sep. 30, 2021
USD ($)
Property
$ / shares
Jul. 27, 2021
$ / shares
Dec. 31, 2020
$ / shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Number of multifamily properties owned | Property   57 57    
Number of units located with multifamily properties | Property   16,109 16,109    
Common stock, par value $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01
Merger Agreement          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Common stock, par value 0.01        
Payments for Merger Related Costs | $   $ 5,276 $ 5,276    
Merger Agreement | Steadfast Apartment REIT, Inc.          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Common stock, par value $ 0.01        
Merger Agreement | Steadfast Apartment REIT, Inc. | Common Shares          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Right to receive shares exchange ratio for each share 0.905        
Merger Agreement | Steadfast Apartment REIT Operating Partnership, L.P. | Common Units          
Organization Consolidation And Presentation Of Financial Statements [Line Items]          
Right to receive shares exchange ratio for each share 1