Segments - Segment reporting information by segment (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Revenue	$ 1,624,856			$ 1,576,746			$ 4,848,971	$ 4,719,260
Employee salaries and benefits	647,940			676,962			1,985,557	2,006,311
Supplies	283,127			275,881			831,301	805,375
Medical professional fees	327,805			305,083			972,718	882,952
Net income (loss) attributable to Ardent Health Inc.	44,516	$ 16,899	$ 39,850	(23,478)	$ 72,950	$ 41,383	101,265	90,855
Reportable Segment
Segment Reporting [Line Items]
Revenue	1,624,856			1,576,746			4,848,971	4,719,260
Employee salaries and benefits	634,718			652,993			1,943,028	1,932,237
Contract labor	13,222			23,969			42,529	74,074
Supplies	283,127			275,881			831,301	805,375
Medical professional fees	122,021			121,901			368,454	338,103
Contract services	205,784			183,182			604,264	544,849
Other segment items	321,468			342,298			958,130	933,767
Net income (loss) attributable to Ardent Health Inc.	$ 44,516			$ (23,478)			$ 101,265	$ 90,855