Real Estate and Other Activities - Summary of Investments in Unconsolidated Operating Entities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	$ 418,074	$ 439,578
Swiss Medical Network [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	177,079	172,453
PHP Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	131,027	149,027
Aevis Victoria SA [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	53,569	63,409
Aspris Children's Services [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	15,939	15,950
Priory [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated operating entities	$ 40,460	$ 38,739