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Stockholder Equity and Noncontrolling Interest - Additional Information (Detail) |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
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Dec. 14, 2021 USD ($) shares | Nov. 01, 2021 shares | Jul. 27, 2021 $ / shares shares | Jun. 29, 2021 USD ($) shares | Dec. 27, 2020 USD ($) shares | Feb. 20, 2020 Agreement $ / shares shares | Dec. 31, 2020 $ / shares shares | Mar. 31, 2020 USD ($) shares | Jun. 30, 2021 shares | Dec. 31, 2021 USD ($) Agreement $ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 shares | Dec. 16, 2021 $ / shares | Jul. 26, 2021 shares | Nov. 13, 2020 USD ($) | May 31, 2016 shares
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At-the-market agreement to sell common shares, maximum offer price | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |
Common stock, par value | $ / shares |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |
Common stock, shares authorized |  |  | 500,000,000 |  |  |  | 500,000,000 |  |  | 500,000,000 | 500,000,000 |  |  | 300,000,000 |  | 4,300,000
Preferred stock, par value | $ / shares |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  |  |  |  |
Preferred stock, shares authorized |  |  | 50,000,000 |  |  |  | 50,000,000 |  |  | 50,000,000 | 50,000,000 |  |  |  |  |
Number of IROP unites exchanged |  |  |  |  |  |  |  |  |  | 122,154 | 196,974 |  |  |  |  |
OP Units outstanding |  |  |  |  |  |  | 674,517 |  |  | 6,981,841 | 674,517 |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 118,659,635 | 10,350,000 | 1,717,291 |  |  |  |
Conversion of noncontrolling interest to common shares (in Shares) |  |  |  |  |  |  |  |  |  | 122,154 | 196,974 | 9,616 |  |  |  |
Steadfast Apartment REIT, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued in connection with merger |  |  |  |  |  |  |  |  |  | 6,429,481 |  |  |  |  |  |
Forward Sale Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 16,100,000 |  |  |  |  |  |
Number of agreements | Agreement |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of shares issued | 16,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds | $ | $ 271,820,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ATM Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected settlement date of forward sales transaction |  | Dec. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
ATM Program | Forward Contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  | $ 23.78 |  |  |  |  |  |
Number of shares issued |  | 1,000,000 |  | 2,932,000 |  |  | 2,932,000 |  | 2,932,000 |  |  |  |  |  |  |
Net proceeds | $ |  |  |  | $ 41,671,000 |  |  |  |  |  | $ 23,780,000 |  |  |  |  |  |
2020 Forward Sale Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  | 10,350,000 |  |  |  |  |  |  |  |  |  |
Number of agreements | Agreement |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  |  | 3,406,000 |  |  |  |  |  |  |  |
Settlement value of shares | $ |  |  |  |  | $ 98,775,000 |  |  | $ 50,000 |  |  |  |  |  |  |  |
Settlement of remaining shares |  |  |  |  | 6,944,000 |  |  |  |  |  |  |  |  |  |  |
Underwriting Agreement | BMO Capital Markets and Bank of Montreal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 16,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  | $ 17.04 |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriters’ option to purchase additional shares |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Underwriting Agreement | BMO Capital Markets and Bank of Montreal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  | 10,350,000 |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  | $ 14.688 |  |  |  |  |  |  |  |  |  |
Underwriters’ option to purchase additional shares |  |  |  |  |  | 1,350,000 |  |  |  |  |  |  |  |  |  |

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