Real Estate and Other Activities - Development and Capital Addition Activities - Additional Information (Detail) € in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 EUR (€)	Dec. 31, 2025 USD ($) Projects
Behavioral Health Hospitals [Member]
Business Combination [Line Items]
Profit (loss) from real estate operations		$ 35.4
General Acute Care Facility [Member]
Business Combination [Line Items]
Profit (loss) from real estate operations		$ 49.0	€ 46
Massachusetts [Member]
Business Combination [Line Items]
Redevelopment of recovery received from settlement excess of damage to property				$ 24.0
TEXAS And MASSACHUSETTS [Member]
Business Combination [Line Items]
Number of other development projects | Projects				2
Idaho [Member]
Business Combination [Line Items]
Profit (loss) from real estate operations	$ 50.0
Minimum [Member] | TEXAS And MASSACHUSETTS [Member]
Business Combination [Line Items]
Construction amount				$ 10.0
Maximum [Member] | TEXAS And MASSACHUSETTS [Member]
Business Combination [Line Items]
Construction amount				$ 15.0