Segment Reporting - Segment Information for Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Resident fees and services	$ 6,027,149	$ 4,753,804	$ 4,173,711
Rental income	1,570,278	1,556,073	1,451,786
Interest income	256,191	168,354	150,571
Other income	137,500	159,764	84,547
Total revenues	7,991,118	6,637,995	5,860,615
Property operating expenses	4,830,211	3,947,776	3,558,770
Consolidated net operating income (loss)	3,160,907	2,690,219	2,301,845
Depreciation and amortization	1,632,093	1,401,101	1,310,368
Contractual interest expense	574,261	607,846	529,519
General and administrative expenses	235,491	179,091	150,390
Loss (gain) on derivatives and financial instruments, net	(27,887)	(2,120)	8,334
Loss (gain) on extinguishment of debt, net	2,130	7	680
Provision for loan losses, net	10,125	9,809	10,320
Impairment of assets	92,793	36,097	17,502
Other expenses	117,459	108,341	101,670
Income (loss) from continuing operations before income taxes and other items	524,442	350,047	173,062
Income tax (expense) benefit	(2,700)	(6,364)	(7,247)
Income (loss) from unconsolidated entities	(496)	(53,442)	(21,290)
Gain (loss) on real estate dispositions and acquisitions of controlling interests, net	451,611	67,898	16,043
Income (loss) from continuing operations	972,857	358,139	160,568
Net income	972,857	358,139	160,568
Non-segment/Corporate
Segment Reporting Information [Line Items]
Resident fees and services	0	0	0
Rental income	0	0	0
Interest income	248,024	166,985	148,965
Other income	116,749	69,868	4,934
Total revenues	364,773	236,853	153,899
Property operating expenses	20,073	18,118	16,245
Consolidated net operating income (loss)	344,700	218,735	137,654
Depreciation and amortization
Contractual interest expense
General and administrative expenses
Loss (gain) on derivatives and financial instruments, net
Loss (gain) on extinguishment of debt, net
Provision for loan losses, net
Impairment of assets
Other expenses
Income (loss) from continuing operations before income taxes and other items
Income tax (expense) benefit
Income (loss) from unconsolidated entities
Gain (loss) on real estate dispositions and acquisitions of controlling interests, net
Income (loss) from continuing operations
Net income
Seniors Housing Operating
Segment Reporting Information [Line Items]
Resident fees and services	587,224	466,162	410,749
Seniors Housing Operating | Operating Segments
Segment Reporting Information [Line Items]
Resident fees and services	6,027,149	4,753,804	4,173,711
Rental income	0	0	0
Interest income	0	0	0
Other income	8,312	9,743	63,839
Total revenues	6,035,461	4,763,547	4,237,550
Property operating expenses	4,523,780	3,655,508	3,292,045
Consolidated net operating income (loss)	1,511,681	1,108,039	945,505
Depreciation and amortization
Contractual interest expense
General and administrative expenses
Loss (gain) on derivatives and financial instruments, net
Loss (gain) on extinguishment of debt, net
Provision for loan losses, net
Impairment of assets
Other expenses
Income (loss) from continuing operations before income taxes and other items
Income tax (expense) benefit
Income (loss) from unconsolidated entities
Gain (loss) on real estate dispositions and acquisitions of controlling interests, net
Income (loss) from continuing operations
Net income
Triple-net | Operating Segments
Segment Reporting Information [Line Items]
Resident fees and services	0	0	0
Rental income	777,297	814,751	782,329
Interest income	8,167	1,369	1,606
Other income	3,307	70,986	6,776
Total revenues	788,771	887,106	790,711
Property operating expenses	40,722	42,194	44,483
Consolidated net operating income (loss)	748,049	844,912	746,228
Depreciation and amortization
Contractual interest expense
General and administrative expenses
Loss (gain) on derivatives and financial instruments, net
Loss (gain) on extinguishment of debt, net
Provision for loan losses, net
Impairment of assets
Other expenses
Income (loss) from continuing operations before income taxes and other items
Income tax (expense) benefit
Income (loss) from unconsolidated entities
Gain (loss) on real estate dispositions and acquisitions of controlling interests, net
Income (loss) from continuing operations
Net income
Outpatient Medical | Operating Segments
Segment Reporting Information [Line Items]
Resident fees and services	0	0	0
Rental income	792,981	741,322	669,457
Interest income	0	0	0
Other income	9,132	9,167	8,998
Total revenues	802,113	750,489	678,455
Property operating expenses	245,636	231,956	205,997
Consolidated net operating income (loss)	556,477	$ 518,533	$ 472,458
Depreciation and amortization
Contractual interest expense
General and administrative expenses
Loss (gain) on derivatives and financial instruments, net
Loss (gain) on extinguishment of debt, net
Provision for loan losses, net
Impairment of assets
Other expenses
Income (loss) from continuing operations before income taxes and other items
Income tax (expense) benefit
Income (loss) from unconsolidated entities
Gain (loss) on real estate dispositions and acquisitions of controlling interests, net
Income (loss) from continuing operations
Net income