Segment Reporting - Other Segment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Compensation	$ 873,837	$ 620,195	$ 1,705,708	$ 1,232,837
Utilities	91,015	72,678	194,917	152,369
Food	77,387	56,132	149,192	111,757
Repairs & maintenance	65,659	50,239	130,214	99,504
Property taxes	88,591	78,353	174,735	155,823
Other segment expenses	318,222	233,700	622,335	455,920
Total property operating expenses	1,514,711	1,111,297	2,977,101	2,208,210
Operating Segments | Seniors Housing Operating
Segment Reporting Information [Line Items]
Compensation	858,972	606,115	1,677,136	1,204,733
Utilities	78,287	59,890	168,214	127,530
Food	77,387	56,132	149,192	111,757
Repairs & maintenance	54,807	40,158	107,790	78,968
Property taxes	64,612	52,434	126,545	102,941
Other segment expenses	304,212	220,177	594,084	428,324
Total property operating expenses	1,438,277	1,034,906	2,822,961	2,054,253
Operating Segments | Triple-net
Segment Reporting Information [Line Items]
Compensation	20	21	32	41
Utilities	115	98	209	187
Food	0	0	0	0
Repairs & maintenance	17	18	46	48
Property taxes	5,999	7,820	11,966	15,970
Other segment expenses	2,501	2,538	5,217	5,066
Total property operating expenses	8,652	10,495	17,470	21,312
Operating Segments | Outpatient Medical
Segment Reporting Information [Line Items]
Compensation	14,845	14,059	28,540	28,063
Utilities	12,613	12,690	26,494	24,652
Food	0	0	0	0
Repairs & maintenance	10,835	10,063	22,378	20,488
Property taxes	17,980	18,099	36,224	36,912
Other segment expenses	6,561	6,274	13,804	13,533
Total property operating expenses	62,834	61,185	127,440	123,648
Non-segment/Corporate
Segment Reporting Information [Line Items]
Compensation	0	0	0	0
Utilities	0	0	0	0
Food	0	0	0	0
Repairs & maintenance	0	0	0	0
Property taxes	0	0	0	0
Other segment expenses	4,948	4,711	9,230	8,997
Total property operating expenses	$ 4,948	$ 4,711	$ 9,230	$ 8,997