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Acquisitions - Additional Information (Detail) $ in Millions | Dec. 31, 2021 USD ($) Bed Hospital Location | Apr. 01, 2019 USD ($) Bed | Feb. 15, 2019 USD ($) Bed Center
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Business Acquisition [Line Items] |  |  |
Number of beds | Bed | 10,500 |  |
CenterPointe Behavioral Health System, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition cash consideration | $ 139.0 |  |
Revolving Facility | $ 70.0 |  |
Number of acute inpatient hospitals | Hospital | 4 |  |
Number of beds | Bed | 306 |  |
Number of outpatient locations | Location | 10 |  |
Bradford Recovery Center [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition cash consideration |  | $ 4.5 |
Number of beds | Bed |  | 46 |
Whittier Pavilion [Member] | Massachusetts [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition cash consideration |  |  | $ 17.9
Number of beds | Bed |  |  | 71
Mission Treatment [Member] | California, Nevada, Arizona and Oklahoma [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition cash consideration |  |  | $ 22.5
Number of comprehensive treatment centers operates | Center |  |  | 9

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