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Stockholder Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 12, 2019 | Jun. 17, 2019 | Mar. 18, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividend declared per share |  |  |  | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 |
Dividends paid |  |  |  | $ 0 |  |  |  |  | $ 209
At-the-market agreement to sell common shares, remaining offer price |  |  |  | $ 96,014 |  |  |  |  | $ 96,014
Limited partnership interest received in exchange for issuance of common stock or cash |  |  |  | 0 |  |  |  |  | 0
OP Units outstanding |  |  |  | 881,107 |  |  |  |  | 881,107
ATM Sales Agreement |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 972,887 |  |  |  |  | 1,548,591
Weighted average price per share |  |  |  | $ 13.45 |  |  |  |  | $ 12.59
Net proceeds after deducting commissions |  |  |  | $ 12,763 |  |  |  |  | $ 18,842
Commissions |  |  |  | $ 260 |  |  |  |  | $ 385
Dividend Declared |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Declaration date | Sep. 12, 2019 | Jun. 17, 2019 | Mar. 18, 2019 |  |  |  |  |  |
Dividend declared per share | $ 0.18 | $ 0.18 | $ 0.18 |  |  |  |  |  |
Payment date | Oct. 25, 2019 | Jul. 25, 2019 | Apr. 25, 2019 |  |  |  |  |  |
Record date | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 |  |  |  |  |  |
Dividend Declared | Noncontrolling Interests |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |
Declaration date | Sep. 12, 2019 | Jun. 17, 2019 | Mar. 18, 2019 |  |  |  |  |  |
Dividend declared per share | $ 0.18 | $ 0.18 | $ 0.18 |  |  |  |  |  |
Payment date | Oct. 25, 2019 | Jul. 25, 2019 | Apr. 25, 2019 |  |  |  |  |  |
Record date | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 |  |  |  |  |  |

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