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Stockholder Equity and Noncontrolling Interest - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 11, 2017 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | 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
At-the-market agreement to sell common shares, remaining offer price |  |  | $ 115,241,000 |  |  |
Net proceeds of public offering |  |  | $ 21,914,000 | $ 137,353,000 | $ 245,309,000 |
Limited partnership interest received in exchange for issuance of common stock |  |  | 2,130,244 | 64,202 |  |
OP Units issued |  | 166,604 |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | $ 1,654,000 |  |  |  |
OP Units outstanding |  |  | 881,107 |  |  |
OP Units redemption value |  |  | $ 8,089,000 |  |  |
Share price |  |  | $ 9.18 |  |  |
Common Shares |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock issued |  |  | 2,196,164,000 | 15,539,900,000 | 28,750,000,000 |
Exchange of units to common stock |  |  | 2,130,244 | 64,202 | 245,980,000 |
ATM Sales Agreement |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Shares issued |  |  | 2,196,164 |  |  |
Average price per share |  |  | $ 10.32 |  |  |
Net proceeds after deducting commissions |  |  | $ 22,213,000 |  |  |
Commissions |  |  | $ 453,000 |  |  |
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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