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Stockholder Equity and Noncontrolling Interest - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 11, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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   $ 93,549,000      
Net proceeds of public offering   $ 20,981,000 $ 21,914,000 $ 137,353,000  
Limited partnership interest received in exchange for issuance of common stock   9,616 2,130,244    
OP Units outstanding   871,491 881,107    
OP Units redemption value   $ 12,271,000 $ 8,089,000    
Share price   $ 14.08 $ 9.18    
Common Shares          
Class Of Stock [Line Items]          
Common stock issued   1,717,291 2,196,164 15,539,900  
Exchange of units to common stock   9,616 2,130,244 64,202  
ATM Sales Agreement          
Class Of Stock [Line Items]          
Shares issued   1,717,291      
Average price per share   $ 12.82      
Net proceeds after deducting commissions   $ 21,258,000      
Commissions   $ 434,000      
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