XML 68 R49.htm IDEA: XBRL DOCUMENT v3.10.0.1
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