Real Estate and Other Activities - Schedule of Concentrations of Credit Risk (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Business Acquisition [Line Items]
Total Assets	$ 14,853,880		$ 14,294,594
Total Revenues	$ 223,799	$ 271,316
Minimum [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Maximum percentage of entity's assets invested on single property	2.00%
Total Gross Assets [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 14,853,880		$ 14,294,594
Percentage of concentration risk	100.00%		100.00%
Total Gross Assets [Member] | Operator Concentration Risk [Member] | Other Assets [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	14.10%		11.80%
Total Gross Assets [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Total Assets	$ 14,853,880		$ 14,294,594
Percentage of concentration risk	100.00%		100.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Texas [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,426,400		$ 1,394,296
Percentage of concentration risk	9.60%		9.80%
Total Gross Assets [Member] | Geographic Concentration [Member] | California [Member]
Business Acquisition [Line Items]
Total Assets	$ 932,742		$ 935,470
Percentage of concentration risk	6.30%		6.40%
Total Gross Assets [Member] | Geographic Concentration [Member] | Florida [Member]
Business Acquisition [Line Items]
Total Assets	$ 850,384		$ 840,876
Percentage of concentration risk	5.70%		5.90%
Total Gross Assets [Member] | Geographic Concentration [Member] | Arizona [Member]
Business Acquisition [Line Items]
Total Assets	$ 383,582		$ 379,801
Percentage of concentration risk	2.60%		2.70%
Total Gross Assets [Member] | Geographic Concentration [Member] | Ohio [Member]
Business Acquisition [Line Items]
Total Assets	$ 334,589		$ 327,577
Percentage of concentration risk	2.20%		2.30%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other States [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,593,144		$ 2,636,587
Percentage of concentration risk	17.50%		18.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Total Assets	$ 7,873,916		$ 7,466,093
Percentage of concentration risk	53.00%		52.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Total Assets	$ 4,088,987		$ 3,985,672
Percentage of concentration risk	27.50%		27.90%
Total Gross Assets [Member] | Geographic Concentration [Member] | Switzerland [Member]
Business Acquisition [Line Items]
Total Assets	$ 728,874		$ 719,632
Percentage of concentration risk	4.90%		5.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Germany [Member]
Business Acquisition [Line Items]
Total Assets	$ 694,425		$ 672,343
Percentage of concentration risk	4.70%		4.70%
Total Gross Assets [Member] | Geographic Concentration [Member] | Spain [Member]
Business Acquisition [Line Items]
Total Assets	$ 259,033		$ 247,996
Percentage of concentration risk	1.70%		1.70%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Total Assets	$ 469,202		$ 464,468
Percentage of concentration risk	3.20%		3.30%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other Domestic Assets [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,353,075		$ 951,486
Percentage of concentration risk	9.10%		6.60%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other International Assets [Member]
Business Acquisition [Line Items]
Total Assets	$ 739,443		$ 738,390
Percentage of concentration risk	5.00%		5.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total International [Member]
Business Acquisition [Line Items]
Total Assets	$ 6,979,964		$ 6,828,501
Percentage of concentration risk	47.00%		47.80%
Total Gross Assets [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 14,853,880		$ 14,294,594
Percentage of concentration risk	100.00%		100.00%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Total Assets	$ 8,601,253		$ 8,493,331
Percentage of concentration risk	57.90%		59.40%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,419,999		$ 2,376,460
Percentage of concentration risk	16.30%		16.70%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Post Acute Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,623,653		$ 1,617,596
Percentage of concentration risk	10.90%		11.30%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	$ 116,457		$ 117,331
Percentage of concentration risk	0.80%		0.80%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Other Assets By Facility [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,092,518		$ 1,689,876
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Other Assets [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	14.10%		11.80%
Total Gross Assets [Member] | Circle [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,078,387		$ 2,026,778
Percentage of concentration risk	14.00%		14.20%
Total Gross Assets [Member] | Priory [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,266,776		$ 1,233,462
Percentage of concentration risk	8.50%		8.60%
Total Gross Assets [Member] | Healthcare Systems of America [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,205,404		$ 1,187,006
Percentage of concentration risk	8.10%		8.30%
Total Gross Assets [Member] | Lifepoint Behavioral [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 817,661		$ 813,584
Percentage of concentration risk	5.50%		5.70%
Total Gross Assets [Member] | Swiss Medical Network [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 728,874		$ 719,632
Percentage of concentration risk	4.90%		5.10%
Total Gross Assets [Member] | Other Operators [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 6,664,260		$ 6,624,256
Percentage of concentration risk	44.90%		46.30%
Total Gross Assets [Member] | Other Assets by Operator [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,092,518		$ 1,689,876
Revenue [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 223,799	$ 271,316
Revenue [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 223,799	$ 271,316
Revenue [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	52.20%	60.20%
Total Revenues	$ 116,840	$ 163,456
Revenue [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	39.60%	33.10%
Total Revenues	$ 88,653	$ 89,907
Revenue [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	8.20%	6.70%
Total Revenues	$ 18,306	$ 17,953
Revenue [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 223,799	$ 271,316
Revenue [Member] | Customer Concentration Risk [Member] | General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	60.30%	65.90%
Total Revenues	$ 135,019	$ 178,710
Revenue [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	23.00%	19.30%
Total Revenues	$ 51,520	$ 52,327
Revenue [Member] | Customer Concentration Risk [Member] | Post Acute Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	15.80%	12.70%
Total Revenues	$ 35,256	$ 34,545
Revenue [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	0.90%	2.10%
Total Revenues	$ 2,004	$ 5,734
Revenue [Member] | Circle [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	22.70%	18.80%
Total Revenues	$ 50,711	$ 51,012
Revenue [Member] | Priory [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	11.10%	9.50%
Total Revenues	$ 24,941	$ 25,882
Revenue [Member] | Common Spirit [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	0.00%	10.80%
Total Revenues	$ 0	$ 29,353
Revenue [Member] | Other Operators [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	66.20%	60.90%
Total Revenues	$ 148,147	$ 165,069