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Revenue - Schedule of Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 587,559	$ 547,961	$ 1,720,914	$ 1,548,653
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	587,559	547,961	1,720,914	1,548,653
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	284,143	259,353	832,692	723,611
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	230,753	211,796	669,552	597,886
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	71,006	71,153	211,377	210,432
U.S. Facilities [Member] | Outpatient Community-Based Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 1,657	$ 5,659	$ 7,293	$ 16,724

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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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