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Revenue - Schedule of U.S. Revenue Attributed to Each Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 760,617	$ 742,241
U.S. Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	487,960	462,405
U.S. Facilities [Member] | Acute Inpatient Psychiatric Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	216,597	195,891
U.S. Facilities [Member] | Specialty Treatment Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	193,035	184,535
U.S. Facilities [Member] | Residential Treatment Centers [Member]
Disaggregation of Revenue [Line Items]
Revenue	73,224	71,557
U.S. Facilities [Member] | Outpatient Community-Based Facilities [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 5,104	$ 10,422

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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