Segment Reporting - Other Segment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Compensation	$ 903,152	$ 673,182	$ 2,608,860	$ 1,906,019
Utilities	106,396	87,637	301,313	240,006
Food	80,626	62,130	229,818	173,887
Repairs and maintenance	71,801	52,121	202,015	151,625
Property taxes	88,847	78,735	263,582	234,558
Other segment expenses	326,226	258,896	948,561	714,816
Total property operating expenses	1,577,048	1,212,701	4,554,149	3,420,911
Operating Segments | Seniors Housing Operating
Segment Reporting Information [Line Items]
Compensation	888,672	659,650	2,565,808	1,864,383
Utilities	91,065	72,153	259,279	199,683
Food	80,626	62,130	229,818	173,887
Repairs and maintenance	60,925	42,015	168,715	120,983
Property taxes	66,160	54,008	192,705	156,949
Other segment expenses	311,767	245,931	905,851	674,255
Total property operating expenses	1,499,215	1,135,887	4,322,176	3,190,140
Operating Segments | Triple-net
Segment Reporting Information [Line Items]
Compensation	28	13	60	54
Utilities	83	52	292	239
Food	0	0	0	0
Repairs and maintenance	34	13	80	61
Property taxes	5,903	6,716	17,869	22,686
Other segment expenses	2,179	2,551	7,396	7,617
Total property operating expenses	8,227	9,345	25,697	30,657
Operating Segments | Outpatient Medical
Segment Reporting Information [Line Items]
Compensation	14,452	13,519	42,992	41,582
Utilities	15,248	15,432	41,742	40,084
Food	0	0	0	0
Repairs and maintenance	10,842	10,093	33,220	30,581
Property taxes	16,784	18,011	53,008	54,923
Other segment expenses	5,993	5,723	19,797	19,256
Total property operating expenses	63,319	62,778	190,759	186,426
Non-segment/Corporate
Segment Reporting Information [Line Items]
Compensation	0	0	0	0
Utilities	0	0	0	0
Food	0	0	0	0
Repairs and maintenance	0	0	0	0
Property taxes	0	0	0	0
Other segment expenses	6,287	4,691	15,517	13,688
Total property operating expenses	$ 6,287	$ 4,691	$ 15,517	$ 13,688