Real Estate and Other Activities - Concentrations of Credit Risk - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Total Gross Assets [Member] | Geographic Concentration [Member] | U.S. [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	63.00%		64.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Europe [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	31.00%		30.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Australia [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	5.00%		5.00%
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 Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	77.00%
Revenue [Member] | Customer Concentration Risk [Member] | General Acute Care Hospital and Healthcare System [Member]
Business Acquisition [Line Items]
Percentage of concentration risk		83.00%
Revenue [Member] | Customer Concentration Risk [Member] | Rehabilitation Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	13.00%	8.00%
Revenue [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk		5.00%
Revenue [Member] | Customer Concentration Risk [Member] | Long Term Acute Care Hospital [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	7.00%
Revenue [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care and Long-Term Acute Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	3.00%	4.00%
Revenue [Member] | Operator Concentration Risk [Member] | Steward Health Care System LLC [Member] | Minimum [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	10.00%	10.00%
Revenue [Member] | Operator Concentration Risk [Member] | Prospect [Member] | Minimum [Member]
Business Acquisition [Line Items]
Percentage of concentration risk		10.00%
Revenue [Member] | Operator Concentration Risk [Member] | Circle [Member] | Minimum [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	10.00%	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	2.80%