Equity - Schedule of Aggregate Distributions Declared for Applicable Class of Common Stock (Detail)	9 Months Ended
	Sep. 30, 2017 $ / shares
Class S Shares [Member]
Dividends Payable [Line Items]
Aggregate distributions declared per share of common stock	$ 0.3245
Stockholder servicing fee per share of common stock	(0.0598)
Net distributions declared per share of common stock	0.2647
Class I Shares [Member]
Dividends Payable [Line Items]
Aggregate distributions declared per share of common stock	0.3245
Net distributions declared per share of common stock	0.3245
Class D Shares [Member]
Dividends Payable [Line Items]
Aggregate distributions declared per share of common stock	0.2471
Stockholder servicing fee per share of common stock	(0.0108)
Net distributions declared per share of common stock	0.2363
Class T Shares [Member]
Dividends Payable [Line Items]
Aggregate distributions declared per share of common stock	0.2030
Stockholder servicing fee per share of common stock	(0.0289)
Net distributions declared per share of common stock	$ 0.1741