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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 |  |  |  |

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