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Stockholders' Equity - Summary of Cash Distributions Per Share that Paid on its Common Stock (Parenthetical) (Detail) - $ / shares
1 Months Ended 12 Months Ended
Nov. 09, 2018
Jun. 29, 2018
Dec. 28, 2018
Nov. 29, 2018
Oct. 30, 2018
Sep. 27, 2018
Aug. 30, 2018
Jul. 30, 2018
Jun. 28, 2018
May 30, 2018
Apr. 27, 2018
Dec. 31, 2018
Dividends, Cash [Abstract]                        
Distributions declared per share for each class of outstanding common stock   $ 0.1510                    
Common Class T [Member]                        
Dividends, Cash [Abstract]                        
Distributions declared per share for each class of outstanding common stock $ 0.1073                      
Fixed net distribution per share     $ 0.1073 $ 0.1073 $ 0.1073 $ 0.1042 $ 0.1042 $ 0.1042 $ 0.1376 $ 0.0946 $ 0.1424 $ 1.0091
Percentage of decrease in stockholders servicing fees payable             0.85%   1.00%