Segment Information - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Management fees	$ 98,038,000			$ 74,750,000			$ 283,486,000	$ 212,395,000
General and administrative expense	(10,529,000)			(9,695,000)			(28,730,000)	(25,220,000)
Transaction, transition and restructuring costs	(6,174,000)			(2,098,000)			(7,245,000)	(2,962,000)
Depreciation and amortization expense	(14,627,000)			(10,729,000)			(41,959,000)	(30,731,000)
Impairment of assets held for sale	(4,733,000)			0			(4,733,000)	0
Interest income	394,000			853,000			1,622,000	1,379,000
Interest expense	(9,910,000)			(9,839,000)			(28,627,000)	(27,394,000)
Gain on extinguishment of debt, net	0			0			0	38,148,000
Loss from equity method investment	(374,000)			(146,000)			(1,087,000)	(181,000)
Other expense, net	(1,902,000)			(153,000)			6,611,000	(379,000)
Provision for income taxes	(88,000)			(68,000)			(254,000)	(193,000)
Net income (loss)	(27,348,000)	$ (1,973,000)	$ (13,025,000)	(14,265,000)	$ (9,816,000)	$ 27,019,000	(42,346,000)	2,938,000
Reportable Segment
Segment Reporting Information [Line Items]
Segment net operating income	20,764,000			17,089,000			62,141,000	49,620,000
Management fees	98,038,000			74,750,000			283,486,000	212,395,000
Other operating expenses	(1,315,000)			(630,000)			(3,426,000)	(1,614,000)
General and administrative expense	(10,529,000)			(9,695,000)			(28,730,000)	(25,220,000)
Transaction, transition and restructuring costs	(6,174,000)			(2,098,000)			(7,245,000)	(2,962,000)
Depreciation and amortization expense	(14,627,000)			(10,729,000)			(41,959,000)	(30,731,000)
Interest income	394,000			853,000			1,622,000	1,379,000
Interest expense	(9,910,000)			(9,839,000)			(28,627,000)	(27,394,000)
Gain on extinguishment of debt, net	0			0			0	38,148,000
Loss from equity method investment	(374,000)			(146,000)			(1,087,000)	(181,000)
Other expense, net	(1,902,000)			(153,000)			6,611,000	(379,000)
Provision for income taxes	(88,000)			(68,000)			(254,000)	(193,000)
Net income (loss)	(27,348,000)			(14,265,000)			(42,346,000)	2,938,000
Management fees
Segment Reporting Information [Line Items]
Management fees	1,146,000			1,151,000			3,341,000	2,465,000
Management fees \| Reportable Segment
Segment Reporting Information [Line Items]
Management fees	$ 1,146,000			$ 1,151,000			$ 3,341,000	$ 2,465,000

SONIDA SENIOR LIVING, INC. 10-Q