Real Estate and Other Activities - Schedule of Concentrations of Credit Risk (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Business Acquisition [Line Items]
Total Assets	$ 14,762,677		$ 15,001,775
Total Revenues	$ 252,065	$ 223,799
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	$ 14,762,677		$ 15,001,775
Percentage of concentration risk	100.00%		100.00%
Total Gross Assets [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Total Assets	$ 14,762,677		$ 15,001,775
Percentage of concentration risk	100.00%		100.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Texas [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,403,311		$ 1,427,391
Percentage of concentration risk	9.50%		9.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | California [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,024,998		$ 977,890
Percentage of concentration risk	7.00%		6.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | Florida [Member]
Business Acquisition [Line Items]
Total Assets	$ 832,712		$ 834,940
Percentage of concentration risk	5.60%		5.60%
Total Gross Assets [Member] | Geographic Concentration [Member] | Ohio [Member]
Business Acquisition [Line Items]
Total Assets	$ 317,842		$ 330,189
Percentage of concentration risk	2.20%		2.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Arizona [Member]
Business Acquisition [Line Items]
Total Assets	$ 329,471		$ 328,873
Percentage of concentration risk	2.20%		2.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other States [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,422,158		$ 2,480,182
Percentage of concentration risk	16.40%		16.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other Domestic Assets [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,046,367		$ 1,072,900
Percentage of concentration risk	7.10%		7.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Total Assets	$ 7,376,859		$ 7,452,365
Percentage of concentration risk	50.00%		49.70%
Total Gross Assets [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Total Assets	$ 4,084,982		$ 4,184,188
Percentage of concentration risk	27.70%		27.90%
Total Gross Assets [Member] | Geographic Concentration [Member] | Switzerland [Member]
Business Acquisition [Line Items]
Total Assets	$ 868,978		$ 873,703
Percentage of concentration risk	5.90%		5.80%
Total Gross Assets [Member] | Geographic Concentration [Member] | Germany [Member]
Business Acquisition [Line Items]
Total Assets	$ 761,421		$ 751,806
Percentage of concentration risk	5.10%		5.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Spain [Member]
Business Acquisition [Line Items]
Total Assets	$ 306,718		$ 302,323
Percentage of concentration risk	2.10%		2.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Total Assets	$ 499,208		$ 504,729
Percentage of concentration risk	3.40%		3.40%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other International Assets [Member]
Business Acquisition [Line Items]
Total Assets	$ 864,511		$ 932,661
Percentage of concentration risk	5.80%		6.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total International [Member]
Business Acquisition [Line Items]
Total Assets	$ 7,385,818		$ 7,549,410
Percentage of concentration risk	50.00%		50.30%
Total Gross Assets [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 14,762,677		$ 15,001,775
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	$ 8,673,783		$ 8,769,909
Percentage of concentration risk	58.80%		58.50%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,407,964		$ 2,445,418
Percentage of concentration risk	16.30%		16.30%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Post Acute Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,668,629		$ 1,671,616
Percentage of concentration risk	11.30%		11.10%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	$ 101,423		$ 109,271
Percentage of concentration risk	0.70%		0.70%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Other Assets By Facility [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,910,878		$ 2,005,561
Percentage of concentration risk	12.90%		13.40%
Total Gross Assets [Member] | Circle [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,069,009		$ 2,121,848
Percentage of concentration risk	14.00%		14.10%
Total Gross Assets [Member] | Priory [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,273,725		$ 1,301,888
Percentage of concentration risk	8.60%		8.70%
Total Gross Assets [Member] | HSA [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,209,459		$ 1,200,996
Percentage of concentration risk	8.20%		8.00%
Total Gross Assets [Member] | Swiss Medical Network [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 868,978		$ 873,703
Percentage of concentration risk	5.90%		5.80%
Total Gross Assets [Member] | Lifepoint Behavioral [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 806,344		$ 809,492
Percentage of concentration risk	5.50%		5.40%
Total Gross Assets [Member] | Other Operators [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 6,624,284		$ 6,688,287
Percentage of concentration risk	44.90%		44.60%
Total Gross Assets [Member] | Other Assets by Operator [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,910,878		$ 2,005,561
Percentage of concentration risk	12.90%		13.40%
Revenue [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 252,065	$ 223,799
Revenue [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 252,065	$ 223,799
Revenue [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	53.50%	52.20%
Total Revenues	$ 134,861	$ 116,840
Revenue [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	38.20%	39.60%
Total Revenues	$ 96,396	$ 88,653
Revenue [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	8.30%	8.20%
Total Revenues	$ 20,808	$ 18,306
Revenue [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 252,065	$ 223,799
Revenue [Member] | Customer Concentration Risk [Member] | General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	62.00%	60.30%
Total Revenues	$ 156,194	$ 135,019
Revenue [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	22.00%	23.00%
Total Revenues	$ 55,575	$ 51,520
Revenue [Member] | Customer Concentration Risk [Member] | Post Acute Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	15.20%	15.80%
Total Revenues	$ 38,370	$ 35,256
Revenue [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	0.80%	0.90%
Total Revenues	$ 1,926	$ 2,004
Revenue [Member] | Circle [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	21.80%	22.70%
Total Revenues	$ 54,961	$ 50,711
Revenue [Member] | Priory [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	10.90%	11.10%
Total Revenues	$ 27,496	$ 24,941
Revenue [Member] | Other Operators [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	67.30%	66.20%
Total Revenues	$ 169,608	$ 148,147