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Equity and Redeemable Non-controlling Interest - Schedule of Aggregate Distributions Declared for Applicable Class of Common Stock (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dividends Payable [Line Items]        
Aggregate gross distributions declared per share of common stock $ 0.1594 $ 0.1581 $ 0.4764 $ 0.4699
Class S Shares [Member]        
Dividends Payable [Line Items]        
Aggregate gross distributions declared per share of common stock     0.4764  
Stockholder servicing fee per share of common stock     (0.0705)  
Net distributions declared per share of common stock     0.4059  
Class T Shares [Member]        
Dividends Payable [Line Items]        
Aggregate gross distributions declared per share of common stock     0.4764  
Stockholder servicing fee per share of common stock     (0.0692)  
Net distributions declared per share of common stock     0.4072  
Class D Shares [Member]        
Dividends Payable [Line Items]        
Aggregate gross distributions declared per share of common stock     0.4764  
Stockholder servicing fee per share of common stock     (0.0205)  
Net distributions declared per share of common stock     0.4559  
Class I Shares [Member]        
Dividends Payable [Line Items]        
Aggregate gross distributions declared per share of common stock     0.4764  
Net distributions declared per share of common stock     $ 0.4764