Acquisitions - Additional Information (Detail) $ in Millions	Apr. 01, 2019 USD ($) Bed	Feb. 15, 2019 USD ($) Bed Center	Mar. 31, 2020 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