Real Estate and Other Activities - 2024 Activity - Additional Information (Detail) £ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 GBP (£)
Debt Instrument [Line Items]
Profit (loss) from real estate operations	$ 20.0	$ 7.0
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