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Stockholder Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 13, 2018
Mar. 31, 2018
Mar. 31, 2017
Aug. 04, 2017
Class Of Stock [Line Items]        
Dividends paid   $ 181,000 $ 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   0    
At-the-market agreement to sell common shares, remaining offer price   $ 137,907,000    
Limited partnership interest received in exchange for issuance of common stock   2,112,136    
Conversion of noncontrolling interest to common shares   $ 14,308,000    
OP Units outstanding   899,215    
Common Shares        
Class Of Stock [Line Items]        
Conversion of noncontrolling interest to common shares (in Shares)   2,112,136    
Conversion of noncontrolling interest to common shares   $ 21,000    
Noncontrolling Interests        
Class Of Stock [Line Items]        
Conversion of noncontrolling interest to common shares   $ (14,308,000)    
Dividend Declared        
Class Of Stock [Line Items]        
Declaration date Mar. 13, 2018      
Dividend declared per share $ 0.18      
Payment date Apr. 20, 2018      
Record date Apr. 04, 2018      
Dividend Declared | Noncontrolling Interests        
Class Of Stock [Line Items]        
Declaration date Mar. 13, 2018      
Dividend declared per share $ 0.18      
Payment date Apr. 20, 2018      
Record date Apr. 04, 2018