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Stockholder Equity and Noncontrolling Interest - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 11, 2017 | Jan. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 04, 2017
Class Of Stock [Line Items] |  |  |  |  |  |  |
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
OP Units issued |  |  | 166,604 |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  | $ 1,654,000 |  |  |  |
Limited partnership interest received in exchange for issuance of common stock |  |  |  | 64,202 | 245,982 |  |
OP Units outstanding |  |  |  | 3,011,351 |  |  |
OP Units redemption value |  |  |  | $ 30,385,000 |  |  |
Share price |  |  |  | $ 10.09 |  | $ 7.51 |
Subsequent Event |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Limited partnership interest received in exchange for issuance of common stock |  | 186,717 |  |  |  |  |
Common Shares |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Common stock issued |  |  |  | 15,539,900 | 28,750,000 | 15,105,669 |
Exchange of units to common stock |  |  |  | 64,202 | 245,980 | 52,933 |
Common Shares | Subsequent Event |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Exchange of units to common stock |  | 186,717 |  |  |  |  |
ATM Sales Agreement |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |
Shares issued |  |  |  | 1,164,900 |  |  |
Average price per share |  |  |  | $ 10.38 |  |  |
Net proceeds after deducting commissions |  |  |  | $ 11,851,000 |  |  |
Commissions |  |  |  | $ 242,000 |  |  |
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 |  |  |  |  |  |
Net proceeds of public offering | $ 126,100,000 |  |  |  |  |  |

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