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Stockholder Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 13, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Aug. 04, 2017
Class Of Stock [Line Items] |  |  |  |
Dividends paid |  | $ 181,000 | $ 126,000 |
At-the-market sales agreement, common stock par value per share |  |  |  | $ 0.01
At-the-market agreement to sell common shares, maximum offer price |  |  |  | $ 150,000,000
At-the-market agreement to sell common shares, compensation to sales agents |  |  |  | 2.00%
At-the-market sales agreement, obligation to sell common shares |  |  |  | $ 0
Shares issued |  | 0 |  |
At-the-market agreement to sell common shares, remaining offer price |  | $ 137,907,000 |  |
Limited partnership interest received in exchange for issuance of common stock |  | 2,112,136 |  |
Conversion of noncontrolling interest to common shares |  | $ 14,308,000 |  |
OP Units outstanding |  | 899,215 |  |
Common Shares |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Conversion of noncontrolling interest to common shares (in Shares) |  | 2,112,136 |  |
Conversion of noncontrolling interest to common shares |  | $ 21,000 |  |
Noncontrolling Interests |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Conversion of noncontrolling interest to common shares |  | $ (14,308,000) |  |
Dividend Declared |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Declaration date | Mar. 13, 2018 |  |  |
Dividend declared per share | $ 0.18 |  |  |
Payment date | Apr. 20, 2018 |  |  |
Record date | Apr. 04, 2018 |  |  |
Dividend Declared | Noncontrolling Interests |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Declaration date | Mar. 13, 2018 |  |  |
Dividend declared per share | $ 0.18 |  |  |
Payment date | Apr. 20, 2018 |  |  |
Record date | Apr. 04, 2018 |  |  |

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