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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Business Acquisition [Line Items]
Total Assets	$ 14,924,195		$ 14,924,195		$ 14,294,594
Total Revenues	$ 237,522	$ 225,827	$ 701,680	$ 763,703
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	$ 14,924,195		$ 14,924,195		$ 14,294,594
Percentage of concentration risk			100.00%		100.00%
Total Gross Assets [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Total Assets	14,924,195		$ 14,924,195		$ 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	1,429,105		$ 1,429,105		$ 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	1,032,272		$ 1,032,272		$ 935,470
Percentage of concentration risk			6.90%		6.40%
Total Gross Assets [Member] | Geographic Concentration [Member] | Florida [Member]
Business Acquisition [Line Items]
Total Assets	838,271		$ 838,271		$ 840,876
Percentage of concentration risk			5.60%		5.90%
Total Gross Assets [Member] | Geographic Concentration [Member] | Ohio [Member]
Business Acquisition [Line Items]
Total Assets	332,436		$ 332,436		$ 327,577
Percentage of concentration risk			2.20%		2.30%
Total Gross Assets [Member] | Geographic Concentration [Member] | Arizona [Member]
Business Acquisition [Line Items]
Total Assets	330,494		$ 330,494		$ 379,801
Percentage of concentration risk			2.20%		2.70%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other States [Member]
Business Acquisition [Line Items]
Total Assets	2,548,691		$ 2,548,691		$ 2,636,587
Percentage of concentration risk			17.10%		18.50%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other Domestic Assets [Member]
Business Acquisition [Line Items]
Total Assets	949,691		$ 949,691		$ 951,486
Percentage of concentration risk			6.40%		6.60%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Total Assets	7,460,960		$ 7,460,960		$ 7,466,093
Percentage of concentration risk			50.00%		52.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Total Assets	4,204,908		$ 4,204,908		$ 3,985,672
Percentage of concentration risk			28.20%		27.90%
Total Gross Assets [Member] | Geographic Concentration [Member] | Switzerland [Member]
Business Acquisition [Line Items]
Total Assets	863,328		$ 863,328		$ 719,632
Percentage of concentration risk			5.80%		5.00%
Total Gross Assets [Member] | Geographic Concentration [Member] | Germany [Member]
Business Acquisition [Line Items]
Total Assets	757,239		$ 757,239		$ 672,343
Percentage of concentration risk			5.10%		4.70%
Total Gross Assets [Member] | Geographic Concentration [Member] | Spain [Member]
Business Acquisition [Line Items]
Total Assets	289,878		$ 289,878		$ 247,996
Percentage of concentration risk			1.90%		1.70%
Total Gross Assets [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Total Assets	504,793		$ 504,793		$ 464,468
Percentage of concentration risk			3.40%		3.30%
Total Gross Assets [Member] | Geographic Concentration [Member] | Other International Assets [Member]
Business Acquisition [Line Items]
Total Assets	843,089		$ 843,089		$ 738,390
Percentage of concentration risk			5.60%		5.20%
Total Gross Assets [Member] | Geographic Concentration [Member] | Total International [Member]
Business Acquisition [Line Items]
Total Assets	7,463,235		$ 7,463,235		$ 6,828,501
Percentage of concentration risk			50.00%		47.80%
Total Gross Assets [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	14,924,195		$ 14,924,195		$ 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	8,912,538		$ 8,912,538		$ 8,493,331
Percentage of concentration risk			59.70%		59.40%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Total Assets	2,456,058		$ 2,456,058		$ 2,376,460
Percentage of concentration risk			16.50%		16.70%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Post Acute Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	1,647,940		$ 1,647,940		$ 1,617,596
Percentage of concentration risk			11.00%		11.30%
Total Gross Assets [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Total Assets	114,879		$ 114,879		$ 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	1,792,780		$ 1,792,780		$ 1,689,876
Percentage of concentration risk			12.00%		11.80%
Total Gross Assets [Member] | Circle [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	2,135,280		$ 2,135,280		$ 2,026,778
Percentage of concentration risk			14.30%		14.20%
Total Gross Assets [Member] | Priory [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	1,306,202		$ 1,306,202		$ 1,233,462
Percentage of concentration risk			8.80%		8.60%
Total Gross Assets [Member] | Healthcare Systems of America [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	1,202,187		$ 1,202,187		$ 1,187,006
Percentage of concentration risk			8.10%		8.30%
Total Gross Assets [Member] | Swiss Medical Network [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	863,329		$ 863,329		$ 719,632
Percentage of concentration risk			5.80%		5.10%
Total Gross Assets [Member] | Lifepoint Behavioral [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	814,878		$ 814,878		$ 813,584
Percentage of concentration risk			5.50%		5.70%
Total Gross Assets [Member] | Other Operators [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	6,809,539		$ 6,809,539		$ 6,624,256
Percentage of concentration risk			45.50%		46.30%
Total Gross Assets [Member] | Other Assets by Operator [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Total Assets	$ 1,792,780		$ 1,792,780		$ 1,689,876
Percentage of concentration risk			12.00%		11.80%
Revenue [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%	100.00%	100.00%
Total Revenues	$ 237,522	$ 225,827	$ 701,680	$ 763,703
Revenue [Member] | Geographic Concentration [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 237,522	$ 225,827
Revenue [Member] | Geographic Concentration [Member] | Total U.S. [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	50.80%	51.20%
Total Revenues	$ 120,650	$ 115,640
Revenue [Member] | Geographic Concentration [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	40.30%	40.60%
Total Revenues	$ 95,713	$ 91,776
Revenue [Member] | Geographic Concentration [Member] | All Other Countries [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	8.90%	8.20%
Total Revenues	$ 21,159	$ 18,411
Revenue [Member] | Customer Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	100.00%	100.00%
Total Revenues	$ 237,522	$ 225,827
Revenue [Member] | Customer Concentration Risk [Member] | General Acute Care Hospitals [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	60.90%	61.60%
Total Revenues	$ 144,760	$ 139,075
Revenue [Member] | Customer Concentration Risk [Member] | Behavioral Health Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	23.10%	23.40%
Total Revenues	$ 54,726	$ 52,799
Revenue [Member] | Customer Concentration Risk [Member] | Post Acute Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	15.20%	13.40%
Total Revenues	$ 36,097	$ 30,278
Revenue [Member] | Customer Concentration Risk [Member] | Freestanding ER/Urgent Care Facilities [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	0.80%	1.60%
Total Revenues	$ 1,939	$ 3,675
Revenue [Member] | Circle [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	22.80%	23.20%	22.60%	20.20%
Total Revenues	$ 54,228	$ 52,427	$ 158,664	$ 153,994
Revenue [Member] | Priory [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	11.60%	11.50%	11.20%	10.00%
Total Revenues	$ 27,481	$ 25,934	$ 78,878	$ 76,449
Revenue [Member] | Other Operators [Member] | Operator Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of concentration risk	65.60%	65.30%	66.20%	69.80%
Total Revenues	$ 155,813	$ 147,466	$ 464,138	$ 533,260