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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