Segments - Segment reporting information by segment (Details) - USD ($) $ in Thousands	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]
Revenue	$ 1,576,746			$ 1,449,817			$ 4,719,260	$ 4,359,783
Salaries and benefits	676,962			635,223			2,006,311	1,880,790
Supplies	275,881			251,862			805,375	769,034
Professional fees	305,083			274,223			882,952	810,820
Net income (loss) attributable to Ardent Health, Inc.	(23,478)	$ 72,950	$ 41,383	26,322	$ 42,770	$ 27,047	90,855	96,139
Reportable Segment
Segment Reporting Information [Line Items]
Revenue	1,576,746			1,449,817			4,719,260	4,359,783
Salaries and benefits	652,993			610,724			1,932,237	1,802,053
Contract labor	23,969			24,499			74,074	78,737
Supplies	275,881			251,862			805,375	769,034
Professional fees	121,901			101,004			338,103	295,295
Contract services	183,182			173,219			544,849	515,525
Other segment items	342,298			262,187			933,767	803,000
Net income (loss) attributable to Ardent Health, Inc.	$ (23,478)			$ 26,322			$ 90,855	$ 96,139