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Revenue - Schedule of U.S. Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 2,314,394	$ 2,089,929	$ 2,008,381
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	2,314,394	2,089,929	2,008,381
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,126,872	984,609	912,097
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	896,564	802,022	788,232
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	283,169	281,158	286,959
U.S. Facilities [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 7,789	$ 22,140	$ 21,093

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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