Stockholders' Equity - Schedule of Cash Distribution On Class of Common Stock (Detail) - $ / shares	Mar. 13, 2019	Nov. 09, 2018	Jun. 29, 2018
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock			$ 0.1510
Common Class F [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock		$ 0.1510
Common Class F [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock	$ 0.1510
Common Class Y [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock		0.1510
Common Class Y [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock	0.1510
Common Class T [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock		0.1073
Common Class T [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock	0.1073
Common Class S [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock		0.1073
Common Class S [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock	0.1073
Common Class D [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock		0.1188
Common Class D [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock	0.1188
Common Class M [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock		0.1188
Common Class M [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock	0.1188
Common Class I [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock		$ 0.1250
Common Class I [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Distributions declared per share for each class of outstanding common stock	$ 0.1250