Real Estate and Other Activities - Summary of Investments in Unconsolidated Operating Entities (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	$ 320,928	$ 322,179
Swiss Medical Network [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	195,838	197,497
Aevis Victoria SA [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	63,346	64,859
Priory Group [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	45,844	43,913
Aspris Children's Services [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	$ 15,900	$ 15,910