CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common stock:	Additional paid-in-capital:	Treasury stock:	Accumulated deficit:	Noncontrolling interest:
Balance at beginning of period at Dec. 31, 2023	$ 405,153	$ 1,988	$ 4,342,362	$ (102,774)	$ (3,837,912)	$ 1,489
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for settlement of prepaid stock purchase contracts		76	(76)
Shares issued for warrant exercise		21	(21)
Restricted stock and restricted stock units, net		19	(19)
Shares withheld for employee taxes		(6)	(3,419)
Compensation expense related to restricted stock grants			10,651
Net income (loss) attributable to Brookdale Senior Living Inc. common stockholders	(118,013)				(118,013)
Net income (loss) attributable to noncontrolling interest	(118,057)					(44)
Balance at end of period at Sep. 30, 2024	294,322	$ 2,098	4,349,478	(102,774)	(3,955,925)	1,445
Balance at beginning of period (in shares) at Dec. 31, 2023		188,253,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for settlement of prepaid stock purchase contracts (in shares)		7,550,000
Shares issued for warrant exercise (in shares)		2,105,000
Restricted stock and restricted stock units, net (in shares)		1,912,000
Shares withheld for employee taxes (in shares)		(579,000)
Balances at end of period (in shares) at Sep. 30, 2024		199,241,000
Balance at beginning of period at Jun. 30, 2024	341,673	$ 2,077	4,346,116	(102,774)	(3,905,205)	1,459
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for settlement of prepaid stock purchase contracts		9	(9)
Shares issued for warrant exercise		12	(12)
Shares withheld for employee taxes			(20)
Compensation expense related to restricted stock grants			3,403
Net income (loss) attributable to Brookdale Senior Living Inc. common stockholders	(50,720)				(50,720)
Net income (loss) attributable to noncontrolling interest	(50,734)					(14)
Balance at end of period at Sep. 30, 2024	294,322	$ 2,098	4,349,478	(102,774)	(3,955,925)	1,445
Balance at beginning of period (in shares) at Jun. 30, 2024		197,201,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for settlement of prepaid stock purchase contracts (in shares)		841,000
Shares issued for warrant exercise (in shares)		1,163,000
Restricted stock and restricted stock units, net (in shares)		39,000
Shares withheld for employee taxes (in shares)		(3,000)
Balances at end of period (in shares) at Sep. 30, 2024		199,241,000
Balance at beginning of period at Dec. 31, 2024	213,905	$ 2,105	4,352,991	(102,774)	(4,039,847)	1,430
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for settlement of prepaid stock purchase contracts		296	(296)
Shares issued for warrant exercise		57	(57)
Restricted stock and restricted stock units, net		31	(31)
Shares withheld for employee taxes		(9)	(6,169)
Compensation expense related to restricted stock grants			9,701
Net income (loss) attributable to Brookdale Senior Living Inc. common stockholders	(222,729)				(222,729)
Net income (loss) attributable to noncontrolling interest	(222,770)					(41)
Balance at end of period at Sep. 30, 2025	$ (5,342)	$ 2,480	4,356,139	(102,774)	(4,262,576)	1,389
Balance at beginning of period (in shares) at Dec. 31, 2024	200,019,826	200,020,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for settlement of prepaid stock purchase contracts (in shares)		29,636,000
Shares issued for warrant exercise (in shares)		5,702,000
Restricted stock and restricted stock units, net (in shares)		3,226,000
Shares withheld for employee taxes (in shares)		(1,058,000)
Balances at end of period (in shares) at Sep. 30, 2025	237,525,591	237,526,000
Balance at beginning of period at Jun. 30, 2025	$ 106,780	$ 2,480	4,353,523	(102,774)	(4,147,850)	1,401
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares withheld for employee taxes			(17)
Compensation expense related to restricted stock grants			2,633
Net income (loss) attributable to Brookdale Senior Living Inc. common stockholders	(114,726)				(114,726)
Net income (loss) attributable to noncontrolling interest	(114,738)					(12)
Balance at end of period at Sep. 30, 2025	$ (5,342)	$ 2,480	$ 4,356,139	$ (102,774)	$ (4,262,576)	$ 1,389
Balance at beginning of period (in shares) at Jun. 30, 2025		237,454,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock and restricted stock units, net (in shares)		74,000
Shares withheld for employee taxes (in shares)		(2,000)
Balances at end of period (in shares) at Sep. 30, 2025	237,525,591	237,526,000