Real Estate and Other Activities - Summary of Investments in Unconsolidated Operating Entities (Detail) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	$ 320,740	$ 322,179
Swiss Medical Network [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	187,346	197,497
Aevis Victoria SA [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	72,571	64,859
Priory Group [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	44,943	43,913
Aspris Children's Services [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	$ 15,880	$ 15,910