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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
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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Number of comprehensive treatment center operates.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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