Real Estate and Other Activities - Disposals - 2024 Activity - Additional Information (Detail) £ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) Facility	Mar. 31, 2024 USD ($) Facility	Mar. 31, 2024 GBP (£) Facility
Debt Instrument [Line Items]
Profit (loss) from real estate operations	$ 20.0	$ 7.0
Number of facilities sold | Facility	2	3	3
Number of ancillary facilities sold | Facility		2	2
Gain (loss) on real estate dispositions	$ 8.1	$ 1.4
Springstone Health Opco, LLC [Member]
Debt Instrument [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		12.0
Behavioral Health Hospitals [Member]
Debt Instrument [Line Items]
Profit (loss) from real estate operations	$ 10.5	35.4
General Acute Care Facility [Member]
Debt Instrument [Line Items]
Profit (loss) from real estate operations		$ 49.0	£ 46