Real Estate and Other Activities - Summary of Investments in Unconsolidated Operating Entities (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	$ 322,179	$ 439,578
Swiss Medical Network [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	197,497	172,453
PHP Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	0	149,027
Priory [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	43,913	38,739
Aevis Victoria SA [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	64,859	63,409
Aspris Children's Services [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	$ 15,910	$ 15,950