Segment Reporting - Summary Information for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Resident fees and services	$ 1,864,530	$ 1,360,274
Rental income	461,567	417,652
Interest income	62,490	52,664
Other income	34,500	29,151
Total revenues	2,423,087	1,859,741
Property operating expenses	1,462,390	1,096,913
Consolidated net operating income (loss)	960,697	762,828
Depreciation and amortization	485,869	365,863
Interest expense	144,962	147,318
General and administrative expenses	63,758	53,318
Loss (gain) on derivatives and financial instruments, net	(3,210)	(3,054)
Loss (gain) on extinguishment of debt, net	6,156	6
Provision for loan losses, net	(2,007)	1,014
Impairment of assets	52,402	43,331
Other expenses	14,060	14,131
Income (loss) from continuing operations before income taxes and other items	198,707	140,901
Income tax (expense) benefit	5,519	(6,191)
Income (loss) from unconsolidated entities	1,263	(7,783)
Gain (loss) on real estate dispositions and acquisitions of controlling interests, net	51,777	4,707
Income (loss) from continuing operations	257,266	131,634
Net income (loss)	257,266	131,634
Seniors Housing Operating
Segment Reporting Information [Line Items]
Rental income	185,225	130,565
Operating Segments | Seniors Housing Operating
Segment Reporting Information [Line Items]
Resident fees and services	1,864,530	1,360,274
Rental income	0	0
Interest income	0	0
Other income	3,341	1,463
Total revenues	1,867,871	1,361,737
Property operating expenses	1,384,684	1,019,347
Consolidated net operating income (loss)	483,187	342,390
Operating Segments | Triple-net
Segment Reporting Information [Line Items]
Resident fees and services	0	0
Rental income	252,688	221,744
Interest income	2,111	0
Other income	231	1,199
Total revenues	255,030	222,943
Property operating expenses	8,818	10,817
Consolidated net operating income (loss)	246,212	212,126
Operating Segments | Outpatient Medical
Segment Reporting Information [Line Items]
Resident fees and services	0	0
Rental income	208,879	195,908
Interest income	0	0
Other income	2,137	2,402
Total revenues	211,016	198,310
Property operating expenses	64,606	62,463
Consolidated net operating income (loss)	146,410	135,847
Non-segment/Corporate
Segment Reporting Information [Line Items]
Resident fees and services	0	0
Rental income	0	0
Interest income	60,379	52,664
Other income	28,791	24,087
Total revenues	89,170	76,751
Property operating expenses	4,282	4,286
Consolidated net operating income (loss)	$ 84,888	$ 72,465