Real Estate and Other Activities - Concentration of Credit Risks and Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transactions [Member]
Business Acquisition [Line Items]
Lease and interest revenue earned from tenants	$ 63.9	$ 29.8	$ 85.3
Total Gross Assets [Member] | Geographic Concentration [Member] | U.S. [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	64.00%	65.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Europe [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	30.00%	28.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Australia [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	5.00%	6.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | South America [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	1.00%	1.00%
Revenue [Member] | Customer Concentration Risk [Member] | General Acute Care Hospital And Healthcare System
Business Acquisition [Line Items]
Percentage of concentration risk	81.00%	87.00%
Revenue [Member] | Customer Concentration Risk [Member] | Rehabilitation Hospital
Business Acquisition [Line Items]
Percentage of concentration risk	8.00%	8.00%
Revenue [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities and Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	4.00%	2.00%
Revenue [Member] | Customer Concentration Risk [Member] | Long Term Acute Care Hospital
Business Acquisition [Line Items]
Percentage of concentration risk	7.00%	3.00%
Revenue [Member] | Operator Concentration Risk [Member] | Steward Health Care System LLC [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	10.00%	10.00%
Revenue [Member] | Operator Concentration Risk [Member] | Circle [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	10.00%
Revenue [Member] | Operator Concentration Risk [Member] | Circle [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of concentration risk		10.00%
Revenue [Member] | Operator Concentration Risk [Member] | Prospect [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	10.00%
Revenue [Member] | Operator Concentration Risk [Member] | Prospect [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of concentration risk		10.00%
Pro Forma [Member] | Total Gross Assets [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Maximum percentage of entity's assets invested on single property	2.70%	3.20%