Investment in Unconsolidated Joint Venture - Schedule of Financial Information of Joint Venture (Details) - USD ($)	2 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Company's Proportional Share:
Equity in loss of unconsolidated joint venture		$ (3,339,202)	$ (663,896)	$ 0
BREIT Steadfast MF JV LP [Member]
Assets:
Real estate assets, net	$ 374,277,205	493,776,142	374,277,205
Other assets	15,328,440	24,091,229	15,328,440
Total assets	389,605,645	517,867,371	389,605,645
Liabilities and equity:
Notes payable, net	264,558,057	340,840,505	264,558,057
Other liabilities	11,525,292	21,501,680	11,525,292
Company’s capital	11,352,230	15,552,513	11,352,230
Other partner’s capital	102,170,066	139,972,673	102,170,066
Total liabilities and equity	389,605,645	517,867,371	389,605,645
Income Statement:
Revenues	5,756,455	60,210,288
Expenses	11,330,228	87,653,451
Net loss	(5,573,773)	(27,443,163)
Company's Proportional Share:
Company’s proportional net loss	(557,377)	(2,744,316)
Amortization of outside basis	(106,519)	(594,886)	$ (106,519)
Equity in loss of unconsolidated joint venture	$ (663,896)	$ (3,339,202)