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Stockholder Equity and Noncontrolling Interest - Additional Information (Detail) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 27, 2020 USD ($) shares | Nov. 13, 2020 USD ($) $ / shares shares | Feb. 20, 2020 Agreement $ / shares shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares
Class Of Stock [Line Items] |  |  |  |  |  |  |
At-the-market agreement to sell common shares, maximum offer price | $ |  | $ 150,000,000 |  |  |  |  |
Limited partnership interest received in exchange for issuance of common stock |  |  |  |  | 196,974 | 9,616 |
OP Units outstanding |  |  |  |  | 674,517 | 871,491 |
Common Shares |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Common stock issued |  |  |  |  | 10,350,000 | 1,717,291 | 2,196,164
Conversion of noncontrolling interest to common shares (in Shares) |  |  |  |  | 196,974 | 9,616 | 2,130,244
Forward Sale Agreement |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Common stock issued |  |  | 10,350,000 |  |  |  |
Number of agreements | Agreement |  |  | 2 |  |  |  |
Settlement value of shares | $ | $ 98,775,000 |  |  | $ 50,000,000 |  |  |
Shares issued |  |  |  | 3,406,000 |  |  |
Settlement of remaining shares | 6,944,000 |  |  |  |  |  |
ATM Program |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Expected settlement date of forward sales transaction |  | Dec. 21, 2021 |  |  |  |  |
ATM Program | Forward Sale Transaction |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Share price | $ / shares |  | $ 14.00 |  |  |  |  |
Shares issued |  | 900,000 |  |  |  |  |
Proceeds from sale of stock upon settlement | $ |  | $ 12,400,000 |  |  |  |  |
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 |  |  |  |
Underwriter's option to purchase additional shares |  |  | 1,350,000 |  |  |  |

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