Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net revenues	$ 15,827,935	$ 14,281,976	$ 13,399,370
Total assets	14,469,749	13,967,602
Provision for asset impairment	0	0	57,550
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	6,895,051	6,190,921	5,729,758
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues	$ 880,000	$ 761,000	685,000
Trade Names | Real Property Assets | Behavioral Health Services
Segment Reporting Information [Line Items]
Provision for asset impairment			$ 58,000