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Revenue - Schedule of Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 851,573	$ 815,634	$ 2,491,310	$ 2,379,725
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	851,573	815,634	2,491,310	2,379,725
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	471,455	439,788	1,379,088	1,269,593
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	148,153	155,787	430,882	450,668
U.S. Facilities [Member] | Comprehensive Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	144,506	134,174	423,013	400,984
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 87,459	$ 85,885	$ 258,327	$ 258,480

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