Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) $ in Thousands	Total	Third Party Joint Ventures [Member]	Common Stock [Member] Class S Shares [Member]	Common Stock [Member] Class T Shares [Member]	Common Stock [Member] Class D Shares [Member]	Common Stock [Member] Class I Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit and Cumulative Distributions [Member]	Total Stockholders' Equity [Member]	Non-controlling Interests [Member] Third Party Joint Ventures [Member]	Non-controlling Interests [Member] BREIT OP Unitholders [Member]
Beginning Balance at Dec. 31, 2017	$ 1,509,639		$ 1,301	$ 56	$ 40	$ 307	$ 1,616,720	$ (132,633)	$ 1,485,791	$ 23,848
Common stock issued	2,082,218		1,045	134	201	560	2,080,278		2,082,218
Offering costs	(131,288)						(131,288)		(131,288)
Distribution reinvestment	66,898		42	2	3	15	66,836		66,898
Common stock/units repurchased	(30,603)		(15)		(2)	(11)	(30,575)		(30,603)
Amortization of restricted stock grants/compensation awards	112						112		112
Net loss	(159,559)							(155,697)	(155,697)	(3,054)	$ (808)
Distributions declared on common stock	(114,881)							(114,881)	(114,881)
Contributions from non-controlling interests	80,216									30,216	50,000
Acquired non-controlling interests	12,802									12,802
Distributions to non-controlling interests	(2,215)									(1,847)	(368)
Allocation to redeemable non-controlling interests	(1,826)						(1,826)		(1,826)
Ending Balance at Sep. 30, 2018	3,311,513		2,373	192	242	871	3,600,257	(403,211)	3,200,724	61,965	48,824
Beginning Balance at Dec. 31, 2017	1,509,639		1,301	56	40	307	1,616,720	(132,633)	1,485,791	23,848
Ending Balance at Dec. 31, 2018	3,914,954		2,770	233	304	1,083	4,327,444	(587,548)	3,744,286	75,592	95,076
Beginning Balance at Jun. 30, 2018	2,621,087		1,986	149	168	667	2,884,242	(297,090)	2,590,122	30,965
Common stock issued	755,559		377	42	73	207	754,860		755,559
Offering costs	(47,436)						(47,436)		(47,436)
Distribution reinvestment	28,397		17	1	3	6	28,370		28,397
Common stock/units repurchased	(19,489)		(7)		(2)	(9)	(19,471)		(19,489)
Amortization of restricted stock grants/compensation awards	62						62		62
Net loss	(58,599)							(57,667)	(57,667)	(124)	(808)
Distributions declared on common stock	(48,454)							(48,454)	(48,454)
Contributions from non-controlling interests	68,942									18,942	50,000
Acquired non-controlling interests	12,802									12,802
Distributions to non-controlling interests	(988)									(620)	(368)
Allocation to redeemable non-controlling interests	(370)						(370)		(370)
Ending Balance at Sep. 30, 2018	3,311,513		2,373	192	242	871	3,600,257	(403,211)	3,200,724	61,965	48,824
Beginning Balance at Dec. 31, 2018	3,914,954		2,770	233	304	1,083	4,327,444	(587,548)	3,744,286	75,592	95,076
Ending Balance at Jun. 30, 2019	6,376,375		3,812	319	529	2,286	6,969,300	(845,511)	6,130,735	113,725	131,915
Beginning Balance at Dec. 31, 2018	3,914,954		2,770	233	304	1,083	4,327,444	(587,548)	3,744,286	75,592	95,076
Common stock issued	5,155,372		1,662	134	381	2,482	5,150,713		5,155,372
Offering costs	(213,228)						(213,228)		(213,228)
Distribution reinvestment	161,771		84	7	9	46	161,625		161,771
Common stock/units repurchased	(161,537)		(52)	(8)	(3)	(84)	(160,672)		(160,819)		(718)
Amortization of restricted stock grants/compensation awards	1,800					3	297		300		1,500
Net loss	(228,291)							(220,721)	(220,721)	(3,631)	(3,939)
Distributions declared on common stock	(279,654)							(279,654)	(279,654)
Contributions from non-controlling interests	89,826									47,938	41,888
Distributions to non-controlling interests	(33,486)									(27,826)	(5,660)
Allocation to redeemable non-controlling interests	(3,875)	$ (3,900)					(3,875)		(3,875)
Ending Balance at Sep. 30, 2019	8,403,652		4,464	366	691	3,530	9,262,304	(1,087,923)	8,183,432	92,073	128,147
Beginning Balance at Jun. 30, 2019	6,376,375		3,812	319	529	2,286	6,969,300	(845,511)	6,130,735	113,725	131,915
Common stock issued	2,344,142		638	45	160	1,251	2,342,048		2,344,142
Offering costs	(59,354)						(59,354)		(59,354)
Distribution reinvestment	67,877		32	3	4	21	67,817		67,877
Common stock/units repurchased	(55,870)		(18)	(1)	(2)	(29)	(55,172)		(55,222)		(648)
Amortization of restricted stock grants/compensation awards	600					1	99		100		500
Net loss	(125,762)							(123,171)	(123,171)	(625)	(1,966)
Distributions declared on common stock	(119,241)							(119,241)	(119,241)
Contributions from non-controlling interests	2,420									1,995	425
Distributions to non-controlling interests	(25,101)									(23,022)	(2,079)
Allocation to redeemable non-controlling interests	(2,434)						(2,434)		(2,434)
Ending Balance at Sep. 30, 2019	$ 8,403,652		$ 4,464	$ 366	$ 691	$ 3,530	$ 9,262,304	$ (1,087,923)	$ 8,183,432	$ 92,073	$ 128,147