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Revenue - Schedule of U.S. Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 750,311	$ 789,362	$ 1,533,121	$ 1,549,979
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	491,475	509,813	1,000,692	997,773
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	224,844	229,128	464,258	445,725
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	192,479	201,269	386,090	394,304
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	68,845	74,084	139,279	147,308
U.S. Facilities [Member] | Outpatient Community-Based Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 5,307	$ 5,332	$ 11,065	$ 10,436

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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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