Segment Reporting - Other Segment Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Compensation	$ 2,715,145	$ 2,230,539	$ 2,019,606
Utilities	328,292	286,066	255,632
Food	246,893	195,410	173,639
Repairs & maintenance	212,205	178,695	163,634
Property taxes	310,572	276,972	253,918
Other segment expenses	1,017,104	780,094	692,341
Total property operating expenses	4,830,211	3,947,776	3,558,770
Operating Segments | Seniors Housing Operating
Segment Reporting Information [Line Items]
Compensation	2,659,251	2,179,578	1,973,307
Utilities	275,885	237,438	213,067
Food	246,893	195,410	173,639
Repairs & maintenance	171,155	141,566	130,828
Property taxes	210,028	172,567	156,585
Other segment expenses	960,568	728,949	644,619
Total property operating expenses	4,523,780	3,655,508	3,292,045
Operating Segments | Triple-net
Segment Reporting Information [Line Items]
Compensation	77	61	109
Utilities	266	380	440
Food	0	0	0
Repairs & maintenance	73	138	211
Property taxes	29,918	32,957	33,128
Other segment expenses	10,388	8,658	10,595
Total property operating expenses	40,722	42,194	44,483
Operating Segments | Outpatient Medical
Segment Reporting Information [Line Items]
Compensation	55,817	50,900	46,190
Utilities	52,141	48,248	42,125
Food	0	0	0
Repairs & maintenance	40,977	36,991	32,595
Property taxes	70,626	71,448	64,205
Other segment expenses	26,075	24,369	20,882
Total property operating expenses	245,636	231,956	205,997
Non-segment/Corporate
Segment Reporting Information [Line Items]
Compensation	0	0	0
Utilities	0	0	0
Food	0	0	0
Repairs & maintenance	0	0	0
Property taxes	0	0	0
Other segment expenses	20,073	18,118	16,245
Total property operating expenses	$ 20,073	$ 18,118	$ 16,245