Fair Value of Financial Instruments - Summary of Fair Value Information of Financial Instruments (Parenthetical) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) Health_Center	Dec. 31, 2021 USD ($)
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Mortgage loans	$ 305,504	$ 213,211
Investments in unconsolidated real estate joint ventures	1,422,010	1,152,927
Investments in unconsolidated operating entities	1,428,061	1,289,434
Loans [Member]
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Investments in unconsolidated operating entities	628,400	521,400
Other loans	197,700	64,500
Shareholder Loan [Member]
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Mortgage loans	159,000	70,100
Investments in unconsolidated real estate joint ventures	$ 289,300	$ 335,600
Fair Value, Recurring [Member] | Colombia [Member]
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Number of facilities acquired | Health_Center	3
Fair Value, Recurring [Member] | Acquisition Loans [Member] | Colombia [Member]
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items]
Number of facilities acquired | Health_Center	3