Segment Reporting - Summary of Financial Results by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Total revenues	$ 733,455	$ 674,882
Expenses:
Total expenses	293,385	267,694
Income from unconsolidated entities	34,682	13,269
Income (loss) from investments in real estate debt	239,361	(1,016,147)
Income from investments in equity securities	91,111	(33,942)
Segment net operating income (loss)	805,224	(629,632)
Depreciation and amortization	(400,387)	(328,805)
General and administrative	(6,960)	(6,682)
Management fee	(73,095)	(49,502)
Performance participation allocation	(143,215)
Net Gain	15,430	371
Interest income	86	1,747
Interest expense	(181,618)	(188,504)
Loss on extinguishment of debt	(3,416)	(1,237)
Other income (expense)	16,835	(14,906)
Net income (loss)	28,884	(1,217,150)
Net (income) loss attributable to non-controlling interests in third party joint ventures	(59)	237
Net income (loss) attributable to non-controlling interests in BREIT OP	(353)	16,826
Net income (loss) attributable to BREIT stockholders	28,472	(1,200,087)
Multifamily [Member]
Revenues:
Total revenues	302,517	239,204
Expenses:
Total expenses	139,941	104,560
Income from investments in equity securities	56,053	(8,890)
Segment net operating income (loss)	218,629	125,754
Depreciation and amortization	(168,043)	(127,326)
Industrial [Member]
Revenues:
Total revenues	230,610	202,238
Expenses:
Total expenses	73,872	57,170
Income from unconsolidated entities	9,335
Income from investments in equity securities	21,642	10,063
Segment net operating income (loss)	187,715	155,131
Depreciation and amortization	(131,895)	(138,124)
Net Lease [Member]
Revenues:
Total revenues	82,795	82,795
Expenses:
Total expenses	221	101
Income from unconsolidated entities	25,347	13,269
Income from investments in equity securities	8,878	(31,897)
Segment net operating income (loss)	116,799	64,066
Depreciation and amortization	(28,499)	(28,155)
Self Storage [Member]
Revenues:
Total revenues	32,971	4,011
Expenses:
Total expenses	15,708	2,102
Segment net operating income (loss)	17,263	1,909
Depreciation and amortization	(37,751)	(2,229)
Hospitality [Member]
Revenues:
Total revenues	59,819	129,046
Expenses:
Total expenses	55,680	99,306
Segment net operating income (loss)	4,139	29,740
Depreciation and amortization	(22,706)	(22,793)
Retail [Member]
Revenues:
Total revenues	15,187	14,521
Expenses:
Total expenses	4,909	3,420
Segment net operating income (loss)	10,278	11,101
Depreciation and amortization	(7,610)	(8,635)
Real Estate Debt [Member]
Expenses:
Income (loss) from investments in real estate debt	239,361	(1,016,147)
Segment net operating income (loss)	239,361	(1,016,147)
Office [Member]
Revenues:
Total revenues	9,556	3,067
Expenses:
Total expenses	3,054	1,035
Income from investments in equity securities	4,538	(3,218)
Segment net operating income (loss)	11,040	(1,186)
Depreciation and amortization	(3,883)	(1,543)
Rental Property [Member]
Revenues:
Total revenues	652,916	532,095
Expenses:
Total expenses	237,705	168,388
Rental Property [Member] | Multifamily [Member]
Revenues:
Total revenues	288,453	227,119
Expenses:
Total expenses	139,941	104,560
Rental Property [Member] | Industrial [Member]
Revenues:
Total revenues	226,760	201,397
Expenses:
Total expenses	73,872	57,170
Rental Property [Member] | Net Lease [Member]
Revenues:
Total revenues	82,795	82,795
Expenses:
Total expenses	221	101
Rental Property [Member] | Self Storage [Member]
Revenues:
Total revenues	30,975	3,564
Expenses:
Total expenses	15,708	2,102
Rental Property [Member] | Retail [Member]
Revenues:
Total revenues	14,430	14,243
Expenses:
Total expenses	4,909	3,420
Rental Property [Member] | Office [Member]
Revenues:
Total revenues	9,503	2,977
Expenses:
Total expenses	3,054	1,035
Other Revenue [Member]
Revenues:
Total revenues	22,396	15,315
Other Revenue [Member] | Multifamily [Member]
Revenues:
Total revenues	14,064	12,085
Other Revenue [Member] | Industrial [Member]
Revenues:
Total revenues	3,850	841
Other Revenue [Member] | Self Storage [Member]
Revenues:
Total revenues	1,996	447
Other Revenue [Member] | Hospitality [Member]
Revenues:
Total revenues	1,676	1,574
Other Revenue [Member] | Retail [Member]
Revenues:
Total revenues	757	278
Other Revenue [Member] | Office [Member]
Revenues:
Total revenues	53	90
Hospitality [Member]
Revenues:
Total revenues	58,143	127,472
Expenses:
Total expenses	$ 55,680	$ 99,306