Equity and Redeemable Non-controlling Interest - Schedule of Company's Outstanding Shares of Common Stock (Detail) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Class Of Stock [Line Items]
Beginning balance	1,535,245,000	1,129,516,000
Common stock issued	81,726,000	524,006,000
Distribution reinvestment	11,761,000	20,931,000
Common stock repurchased	(28,592,000)	(74,313,000)
Ending balance	1,600,140,000	1,600,140,000
Class S Shares [Member]
Class Of Stock [Line Items]
Beginning balance	611,149,000	530,813,000
Common stock issued	25,770,000	124,298,000
Distribution reinvestment	5,433,000	9,931,000
Common stock repurchased	(10,144,000)	(32,834,000)
Ending balance	632,208,000	632,208,000
Class I Shares [Member]
Class Of Stock [Line Items]
Beginning balance	783,816,000	474,279,000
Common stock issued	47,450,000	372,282,000
Distribution reinvestment	5,132,000	8,820,000
Common stock repurchased	(15,585,000)	(34,568,000)
Ending balance	820,813,000	820,813,000
Class T Shares [Member]
Class Of Stock [Line Items]
Beginning balance	43,898,000	39,767,000
Common stock issued	1,177,000	5,988,000
Distribution reinvestment	352,000	649,000
Common stock repurchased	(1,470,000)	(2,447,000)
Ending balance	43,957,000	43,957,000
Class D Shares [Member]
Class Of Stock [Line Items]
Beginning balance	96,382,000	84,657,000
Common stock issued	7,329,000	21,438,000
Distribution reinvestment	844,000	1,531,000
Common stock repurchased	(1,393,000)	(4,464,000)
Ending balance	103,162,000	103,162,000