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Acquisitions - Additional Information (Detail) $ in Millions | Apr. 01, 2019 USD ($) Bed | Feb. 15, 2019 USD ($) Bed Center | Nov. 13, 2017 USD ($) Bed | Dec. 31, 2019 Bed
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Business Acquisition [Line Items] |  |  |  |
Number of beds | Bed |  |  |  | 18,200
Bradford [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of beds | Bed | 46 |  |  |
Business acquisition cash consideration | $ | $ 4.5 |  |  |
Whittier Pavilion [Member] | Massachusetts [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of beds | Bed |  | 71 |  |
Business acquisition cash consideration | $ |  | $ 17.9 |  |
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 |  |
Aspire [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of beds | Bed |  |  | 36 |
Business acquisition cash consideration | $ |  |  | $ 21.3 |

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