Real Estate and Other Activities - Schedule of Concentrations of Credit Risk (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Business Acquisition [Line Items]
Total Assets	$ 14,393,696		$ 14,393,696		$ 15,001,775
Total Revenues	$ 250,140	$ 237,522	$ 761,488	$ 701,680
Minimum [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Maximum percentage of entity's assets invested on single property	2.00%		2.00%
Total Gross Assets [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 14,393,696		$ 14,393,696		$ 15,001,775
Percentage of concentration risk			100.00%		100.00%
Total Gross Assets [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Total Assets	14,393,696		$ 14,393,696		$ 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	1,342,420		$ 1,342,420		$ 1,427,391
Percentage of concentration risk			9.30%		9.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | California [Member]
Business Acquisition [Line Items]
Total Assets	1,019,239		$ 1,019,239		$ 977,890
Percentage of concentration risk			7.10%		6.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | Florida [Member]
Business Acquisition [Line Items]
Total Assets	938,178		$ 938,178		$ 834,940
Percentage of concentration risk			6.50%		5.60%
Total Gross Assets [Member] | Geographic Concentration [Member] | Arizona [Member]
Business Acquisition [Line Items]
Total Assets	323,495		$ 323,495		$ 328,873
Percentage of concentration risk			2.30%		2.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Ohio [Member]
Business Acquisition [Line Items]
Total Assets	298,358		$ 298,358		$ 330,189
Percentage of concentration risk			2.10%		2.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other States [Member]
Business Acquisition [Line Items]
Total Assets	2,091,815		$ 2,091,815		$ 2,480,182
Percentage of concentration risk			14.50%		16.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other Domestic Assets [Member]
Business Acquisition [Line Items]
Total Assets	1,130,082		$ 1,130,082		$ 1,072,900
Percentage of concentration risk			7.80%		7.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Total Assets	7,143,587		$ 7,143,587		$ 7,452,365
Percentage of concentration risk			49.60%		49.70%
Total Gross Assets [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Total Assets	4,050,310		$ 4,050,310		$ 4,184,188
Percentage of concentration risk			28.10%		27.90%
Total Gross Assets [Member] | Geographic Concentration [Member] | Germany [Member]
Business Acquisition [Line Items]
Total Assets	738,266		$ 738,266		$ 751,806
Percentage of concentration risk			5.10%		5.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Switzerland [Member]
Business Acquisition [Line Items]
Total Assets	718,144		$ 718,144		$ 873,703
Percentage of concentration risk			5.00%		5.80%
Total Gross Assets [Member] | Geographic Concentration [Member] | Spain [Member]
Business Acquisition [Line Items]
Total Assets	309,424		$ 309,424		$ 302,323
Percentage of concentration risk			2.20%		2.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Total Assets	488,147		$ 488,147		$ 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	945,818		$ 945,818		$ 932,661
Percentage of concentration risk			6.60%		6.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total International [Member]
Business Acquisition [Line Items]
Total Assets	7,250,109		$ 7,250,109		$ 7,549,410
Percentage of concentration risk			50.40%		50.30%
Total Gross Assets [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	14,393,696		$ 14,393,696		$ 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	8,197,967		$ 8,197,967		$ 8,769,909
Percentage of concentration risk			57.00%		58.50%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Total Assets	2,383,953		$ 2,383,953		$ 2,445,418
Percentage of concentration risk			16.50%		16.30%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Post Acute Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	1,640,825		$ 1,640,825		$ 1,671,616
Percentage of concentration risk			11.40%		11.10%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	95,051		$ 95,051		$ 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	2,075,900		$ 2,075,900		$ 2,005,561
Percentage of concentration risk			14.40%		13.40%
Total Gross Assets [Member] | Circle [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	2,047,298		$ 2,047,298		$ 2,121,848
Percentage of concentration risk			14.20%		14.10%
Total Gross Assets [Member] | Priory [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	1,267,706		$ 1,267,706		$ 1,301,888
Percentage of concentration risk			8.80%		8.70%
Total Gross Assets [Member] | HSA [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	1,268,331		$ 1,268,331		$ 1,200,996
Percentage of concentration risk			8.80%		8.00%
Total Gross Assets [Member] | Lifepoint Behavioral Health [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	783,455		$ 783,455		$ 809,492
Percentage of concentration risk			5.50%		5.40%
Total Gross Assets [Member] | Lifepoint Health [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	752,041		$ 752,041		$ 458,055
Percentage of concentration risk			5.20%		3.10%
Total Gross Assets [Member] | Other Operators [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	6,198,965		$ 6,198,965		$ 7,103,935
Percentage of concentration risk			43.10%		47.30%
Total Gross Assets [Member] | Other Assets by Operator [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 2,075,900		$ 2,075,900		$ 2,005,561
Percentage of concentration risk			14.40%		13.40%
Revenue [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%	100.00%	100.00%
Total Revenues	$ 250,140	$ 237,522	$ 761,488	$ 701,680
Revenue [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 250,140	$ 237,522
Revenue [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	52.60%	50.80%
Total Revenues	$ 131,603	$ 120,650
Revenue [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	38.80%	40.30%
Total Revenues	$ 97,063	$ 95,713
Revenue [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	8.60%	8.90%
Total Revenues	$ 21,474	$ 21,159
Revenue [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 250,140	$ 237,522
Revenue [Member] | Customer Concentration Risk [Member] | General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	63.00%	60.90%
Total Revenues	$ 157,580	$ 144,760
Revenue [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	21.80%	23.10%
Total Revenues	$ 54,565	$ 54,726
Revenue [Member] | Customer Concentration Risk [Member] | Post Acute Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	14.40%	15.20%
Total Revenues	$ 35,930	$ 36,097
Revenue [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	0.80%	0.80%
Total Revenues	$ 2,065	$ 1,939
Revenue [Member] | Circle [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	21.90%	22.80%	21.60%	22.60%
Total Revenues	$ 54,807	$ 54,228	$ 164,467	$ 158,664
Revenue [Member] | Priory [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	11.30%	11.60%	10.90%	11.20%
Total Revenues	$ 28,279	$ 27,481	$ 83,144	$ 78,878
Revenue [Member] | Other Operators [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	66.80%	65.60%	67.50%	66.20%
Total Revenues	$ 167,054	$ 155,813	$ 513,877	$ 464,138