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v3.19.1

Commitments and Contingencies - Additional Information (Detail) |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 15, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 Facility | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Maximum professional liability aggregate policy limit |  | $ 75,000,000.0 |  |
Pioneer Behavioral Health [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Legal settlement amount paid | $ 3,100,000 |  |  |
West Virginia [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of comprehensive treatment centers operate | Facility |  |  | 7 |
West Virginia [Member] | Other Accrued Liabilities [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation reserve |  |  |  | $ 19,000,000.0
Maximum [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Maximum self insured professional liability limit per claim |  | 3,000,000.0 |  |
Minimum [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Maximum professional liability retention limit |  | $ 3,000,000.0 |  |

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