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Dispositions and Acquisitions - Additional Information (Detail) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2018 USD ($) Facility Bed | Jun. 30, 2018 USD ($) Bed | Jun. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Acquisition, cash paid |  | $ 21,000,000 | $ 20,000,000
Aggregate cash proceeds from divestiture of businesses |  |  | $ 0
The Limes |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate cash proceeds from divestiture of businesses |  | $ 14,000,000 |
Number of beds | Bed |  | 18 |
Gulfport Behavioral Health System |  |  |
Business Acquisition [Line Items] |  |  |
Number of beds | Bed |  | 109 |
Danshell Group | Subsequent Event | Located in U.K. |  |  |
Business Acquisition [Line Items] |  |  |
Number of beds | Bed | 288 |  |
Number of behavioral health care facilities | Facility | 25 |  |
Purchase price | $ 92,000,000 |  |

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