Equity and Redeemable Non-controlling Interest - Schedule of Aggregate Distributions Declared for Applicable Class of Common Stock (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividends Payable [Line Items]
Gross distributions declared per share of common stock	$ 0.6363	$ 0.6286	$ 0.4782
Class S Shares [Member]
Dividends Payable [Line Items]
Gross distributions declared per share of common stock	0.6363	0.6286	0.4782
Stockholder servicing fee per share of common stock	(0.0951)	(0.0917)	(0.0823)
Net distributions declared per share of common stock	0.5412	0.5369	0.3959
Class I Shares [Member]
Dividends Payable [Line Items]
Gross distributions declared per share of common stock	0.6363	0.6286	0.4782
Net distributions declared per share of common stock	0.6363	0.6286	0.4782
Class T Shares [Member]
Dividends Payable [Line Items]
Gross distributions declared per share of common stock	0.6363	0.6286	0.3567
Stockholder servicing fee per share of common stock	(0.0935)	(0.0902)	(0.0511)
Net distributions declared per share of common stock	0.5428	0.5384	0.3056
Class D Shares [Member]
Dividends Payable [Line Items]
Gross distributions declared per share of common stock	0.6363	0.6286	0.4008
Stockholder servicing fee per share of common stock	(0.0276)	(0.0267)	(0.0173)
Net distributions declared per share of common stock	$ 0.6087	$ 0.6019	$ 0.3835