Equity and Redeemable Non-controlling Interest - Schedule of Company's Outstanding Shares of Common Stock (Detail) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Beginning balance	170,384,000	20,000
Common stock issued	264,283,000	167,954,000
Distribution reinvestment	9,479,000	2,461,000
Common stock repurchased	(5,245,304)	(66,888)
Independent directors' restricted stock grant	37,000	16,000
Ending balance	438,938,000	170,384,000
Class S Shares [Member]
Class of Stock [Line Items]
Beginning balance	130,085,145	0
Common stock issued	142,828,000	128,277,000
Distribution reinvestment	6,266,000	1,834,000
Common stock repurchased	(2,190,000)	(26,000)
Ending balance	276,989,019	130,085,145
Class T Shares [Member]
Class of Stock [Line Items]
Beginning balance	5,624,614	0
Common stock issued	17,379,000	5,600,000
Distribution reinvestment	385,000	25,000
Common stock repurchased	(76,000)
Ending balance	23,313,429	5,624,614
Class D Shares [Member]
Class of Stock [Line Items]
Beginning balance	3,955,114	0
Common stock issued	26,112,000	3,931,000
Distribution reinvestment	434,000	24,000
Common stock repurchased	(126,000)
Ending balance	30,375,353	3,955,114
Class I Shares [Member]
Class of Stock [Line Items]
Beginning balance	30,719,160	20,000
Common stock issued	77,964,000	30,146,000
Distribution reinvestment	2,394,000	578,000
Common stock repurchased	(2,853,000)	(41,000)
Independent directors' restricted stock grant	37,000	16,000
Ending balance	108,261,331	30,719,160