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Shareholder Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 11, 2017 | Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 29, 2017 | Aug. 04, 2017 | Dec. 31, 2016
Class Of Stock [Line Items] |  |  |  |  |  |  |
Dividends paid |  |  | $ 0 | $ 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 pursuant to at-the-market sales agreement |  |  | 0 | 0 |  |  |
Common stock, par value |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01
Public offering price per share |  |  |  |  | $ 10.17 |  |
Proceeds from issuance of common stock |  |  |  | $ 125,707,000 |  |  |
OP Units issued |  | 166,604 |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | $ 1,654,000 |  |  |  |  |
OP Units outstanding |  |  | 3,035,654 | 3,035,654 |  |  |
OP Units redemption value |  |  | $ 30,873,000 | $ 30,873,000 |  |  |
Underwritten public offering |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Common stock issued | 12,500,000 |  |  |  |  |  |
Common stock, par value | $ 9.25 |  |  |  |  |  |
Public offering price per share | $ 1,875,000 |  |  |  |  |  |
Proceeds from issuance of common stock | $ 126,100,000 |  |  |  |  |  |

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