Capitalization - Summary of Classes of Common Stock Authorized (Detail) - $ / shares	Sep. 30, 2018	Apr. 11, 2018	Jan. 10, 2018
Schedule of Capitalization, Equity [Line Items]
Preferred stock, shares authorized (in shares)	50,000,000		50,000,000
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,050,000,000	1,000,000,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Preferred Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Preferred stock, shares authorized (in shares)		50,000,000
Preferred stock, par value (in dollars per share)		$ 0.01
Common Class T- [Member]
Schedule of Capitalization, Equity [Line Items]
Common stock, shares authorized (in shares)		250,000,000
Common stock, par value (in dollars per share)		$ 0.01
Common Class S- [Member]
Schedule of Capitalization, Equity [Line Items]
Common stock, shares authorized (in shares)		250,000,000
Common stock, par value (in dollars per share)		$ 0.01
Common Class D [Member]
Schedule of Capitalization, Equity [Line Items]
Common stock, shares authorized (in shares)		250,000,000
Common stock, par value (in dollars per share)		$ 0.01
Common Class I- [Member]
Schedule of Capitalization, Equity [Line Items]
Common stock, shares authorized (in shares)		250,000,000
Common stock, par value (in dollars per share)		$ 0.01