Equity - Additional Information (Detail)			12 Months Ended
	May 31, 2017 USD ($) shares	Apr. 30, 2017 USD ($) shares	Dec. 31, 2017 USD ($) Class shares	Dec. 31, 2016 shares
Equity [Line Items]
Number of classes of common stock | Class			4
Number of Shares, Authorized to issue, Total			2,100,000,000
Common stock, shares issued			170,384,033
Net proceeds from issuance of common stock | $			$ 1,700,000,000
Common stock repurchased			67,000
Effective income tax rate distribution for ordinary income, percent			34.15%
Effective income tax rate distribution for return of capital, percent			65.85%
Ordinary income not qualified for distributions payment			32.55%
Ordinary income qualified for distributions payment			1.60%
Class D Shares [Member]
Equity [Line Items]
Common stock, shares issued			3,955,114	0
Number of shares sold		0
Distributions declared for shares | $		$ 0
Class T Shares [Member]
Equity [Line Items]
Common stock, shares issued			5,624,614	0
Number of shares sold	0
Distributions declared for shares | $	$ 0
Share Repurchase Plan [Member]
Equity [Line Items]
Common stock repurchased			66,888