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Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Sep. 30, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class Of Stock [Line Items]        
Aggregate proceeds received from offering $ 1,700,000 $ 22,013 $ 43,220 $ 42,554
Subscriptions received for common stock through public offering and reinvestment plan (in shares)   2.1 4.3 4.4
Cash distribution declared   $ 81,064 $ 77,732 $ 74,008
Cash paid to stockholders   59,051 34,512 31,454
Redemptions of common stock   4,400 4,700 3,700
Common stock approved for redemption value   $ 2,800 $ 4,700 $ 3,700
Redemption of common stock, per share   $ 10.14 $ 9.99 $ 9.73
Redemptions of common stock   $ 28,443 $ 47,332 $ 36,243
Suspended redemption request common stock, value   $ 16,400    
Suspended redemption request common stock, shares   1.6    
Redemption plan suspended date   Jul. 11, 2018    
Description of redemption plan   There can be no guarantee that the Redemption Plan will be reinstated by the Company’s board of directors.    
Reinvestment Plan        
Class Of Stock [Line Items]        
Cash distribution declared   $ 22,000 $ 43,200 $ 42,600
Watercrest Katy        
Class Of Stock [Line Items]        
Redeemable noncontrolling interest in joint venture   5.00%