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Revenue - Schedule of U.S. Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 833,304	$ 777,251	$ 2,366,425	$ 2,327,230
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	547,961	509,383	1,548,653	1,507,156
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	259,353	233,141	723,611	678,866
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	211,796	201,169	597,886	595,473
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	71,153	69,681	210,432	216,989
U.S. Facilities [Member] | Outpatient Community-Based Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 5,659	$ 5,392	$ 16,724	$ 15,828

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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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