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Revenue - Schedule of Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 2,928,738	$ 2,610,399	$ 2,314,394
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,928,738	2,610,399	2,314,394
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,489,248	1,330,757	1,126,872
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	614,220	564,671	510,929
U.S. Facilities [Member] | Comprehensive Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	500,242	419,940	385,635
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 325,028	$ 295,031	283,169
U.S. Facilities [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue			$ 7,789

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