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Shareholder Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 13, 2018 | Mar. 13, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Aug. 04, 2017
Class Of Stock [Line Items] |  |  |  |  |  |  |
Dividends paid |  |  |  | $ 0 |  | $ 181,000 |
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
At-the-market agreement to sell common shares, remaining offer price |  |  |  | $ 137,273,000 |  | $ 137,273,000 |
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 |  | 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) |
ATM Sales Agreement |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Shares issued |  |  |  | 61,656 | 0 |  |
Weighted average price per share |  |  |  | $ 10.29 |  | $ 10.29 |
Commissions |  |  |  | $ 622,000 |  |  |
Net proceeds after deducting commissions |  |  |  | $ 13,000 |  |  |
ATM Sales Agreement | Subsequent Event |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Shares issued |  |  | 594,127 |  |  |  |
Weighted average price per share |  |  | $ 10.31 |  |  |  |
Commissions |  |  | $ 6,005,000 |  |  |  |
Net proceeds after deducting commissions |  |  | $ 123,000 |  |  |  |
Dividend Declared |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Declaration date | Jun. 13, 2018 | Mar. 13, 2018 |  |  |  |  |
Dividend declared per share | $ 0.18 | $ 0.18 |  |  |  |  |
Payment date | Jul. 20, 2018 | Apr. 20, 2018 |  |  |  |  |
Record date | Jul. 06, 2018 | Apr. 04, 2018 |  |  |  |  |
Dividend Declared | Noncontrolling Interests |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Declaration date | Jun. 13, 2018 | Mar. 13, 2018 |  |  |  |  |
Dividend declared per share | $ 0.18 | $ 0.18 |  |  |  |  |
Payment date | Jul. 20, 2018 | Apr. 20, 2018 |  |  |  |  |
Record date | Jul. 06, 2018 | Apr. 04, 2018 |  |  |  |  |

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