Equity and Redeemable Non-controlling Interest - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Equity [Line Items]
Common stock repurchased			14,655,194
BREIT OP units repurchased			64,393
Stock repurchased, value in operating partnership unit			$ 161,500
Non-controlling interests attributable to third party joint ventures	$ 92,073		92,073			$ 75,592
Allocation adjustment amount between additional paid-in capital and redeemable non controlling interest	2,434	$ 370	3,875	$ 1,826
Third Party Joint Ventures [Member]
Equity [Line Items]
Non-controlling interests attributable to third party joint ventures	$ 8,700		8,700
Allocation adjustment amount between additional paid-in capital and redeemable non controlling interest			$ 3,900
Class S Shares [Member]
Equity [Line Items]
Common stock, shares authorized	1,000,000,000		1,000,000,000		500,000,000
Class I Shares [Member]
Equity [Line Items]
Common stock, shares authorized	1,000,000,000		1,000,000,000		500,000,000