Segment Reporting - Summary of Financial Results by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	7 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017
Revenues:
Rental revenue	$ 33,599		$ 55,727
Tenant reimbursement income	3,230		5,503
Hotel revenue	9,874		15,048
Other revenue	2,201		3,409
Total revenues	48,904		79,687
Expenses:
Rental property operating	15,938		25,632
Hotel operating	6,668		9,617
Total expenses	22,606		35,249
Income from real estate-related securities	4,026		7,435
Segment net operating income	30,324		51,873
Depreciation and amortization	40,359	$ 0	65,145
Other income (expense):
General and administrative	(1,716)		(5,969)
Management fee	(3,712)		(3,712)
Performance participation allocation	(5,711)		(10,952)
Interest income	36		418
Interest expense	(10,866)		(16,413)
Other expenses	(27)		(55)
Income tax benefit	184		140
Net loss	(31,847)	$ 0	(49,815)
Net loss attributable to non-controlling interests	122		122
Net loss attributable to BREIT stockholders	(31,725)		(49,693)
Multifamily [Member]
Revenues:
Rental revenue	24,911		39,466
Tenant reimbursement income	964		1,472
Other revenue	2,182		3,385
Total revenues	28,057		44,323
Expenses:
Rental property operating	12,588		19,473
Total expenses	12,588		19,473
Segment net operating income	15,469		24,850
Depreciation and amortization	32,606		51,205
Industrial [Member]
Revenues:
Rental revenue	7,737		14,357
Tenant reimbursement income	2,036		3,703
Other revenue	7		6
Total revenues	9,780		18,066
Expenses:
Rental property operating	3,029		5,664
Total expenses	3,029		5,664
Segment net operating income	6,751		12,402
Depreciation and amortization	5,408		9,852
Hotel [Member]
Revenues:
Hotel revenue	9,874		15,048
Total revenues	9,874		15,048
Expenses:
Hotel operating	6,668		9,617
Total expenses	6,668		9,617
Segment net operating income	3,206		5,431
Depreciation and amortization	1,862		3,119
Retail [Member]
Revenues:
Rental revenue	951		1,904
Tenant reimbursement income	230		328
Other revenue	12		18
Total revenues	1,193		2,250
Expenses:
Rental property operating	321		495
Total expenses	321		495
Segment net operating income	872		1,755
Depreciation and amortization	483		969
Real Estate-Related Securities [Member]
Expenses:
Income from real estate-related securities	4,026		7,435
Segment net operating income	$ 4,026		$ 7,435