Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 3,909,456	$ 3,962,624
Goodwill acquired during the period	4,598	0
Goodwill divested during the period	(6,062)	0
Adjustments to goodwill	24,415	(53,168)	[1]
Goodwill, Ending Balance	3,932,407	3,909,456
Acute Care Services
Goodwill [Line Items]
Goodwill, Beginning Balance	516,626	515,936
Goodwill acquired during the period	0	0
Goodwill divested during the period	0	0
Adjustments to goodwill	2	690	[1]
Goodwill, Ending Balance	516,628	516,626
Behavioral Health Services
Goodwill [Line Items]
Goodwill, Beginning Balance	3,392,830	3,446,688
Goodwill acquired during the period	4,598	0
Goodwill divested during the period	(6,062)	0
Adjustments to goodwill	24,413	(53,858)	[1]
Goodwill, Ending Balance	$ 3,415,779	$ 3,392,830

[1] The changes in the Behavioral Health Services’ goodwill consist of foreign currency translation adjustments.