Capitalization - Additional Information (Detail)		9 Months Ended
	Apr. 11, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) class shares	Jan. 10, 2018 shares
Schedule of Capitalization, Equity [Line Items]
Common stock, shares authorized (in shares) | shares	1,050,000,000	1,000,000,000	1,000,000,000
Number of classes of stock | class		4
Proceeds and holding of investors' funds in interest bearing escrow account until amount of purchase order received		$ 150,000,000
Purchase orders or investor funds from Offering		$ 0
Primary Offering [Member]
Schedule of Capitalization, Equity [Line Items]
Purchase price of shares (in dollars per share) | $ / shares	$ 10
Primary Offering [Member] | Maximum [Member]
Schedule of Capitalization, Equity [Line Items]
Offering of common stock	$ 1,600,000,000
Distribution Reinvestment Plan [Member] | Maximum [Member]
Schedule of Capitalization, Equity [Line Items]
Offering of common stock	$ 400,000,000