Schedule III - Real Estate and Accumulated Depreciation - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	$ 2,467,223
Initial cost of land and land improvements	4,548,384
Initial cost of building and improvements	37,700,252
Cost Capitalized Subsequent to Acquisition	9,187,992
Carrying amount of land and land improvements	5,271,418
Carrying amount of building and improvements	46,028,087
Accumulated depreciation	10,626,263	$ 9,274,814	$ 8,075,733	$ 6,910,114
Construction in progress
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances
Initial cost of land and land improvements	0
Initial cost of building and improvements	1,219,720
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements
Carrying amount of building and improvements	1,219,720
Accumulated depreciation
Seniors Housing Operating
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	2,042,580
Initial cost of land and land improvements	2,691,130
Initial cost of building and improvements	23,420,021
Cost Capitalized Subsequent to Acquisition	6,501,381
Carrying amount of land and land improvements	3,197,957
Carrying amount of building and improvements	29,362,814
Accumulated depreciation	6,807,019
Seniors Housing Operating | Operating Segments
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	2,042,580
Initial cost of land and land improvements	2,691,130
Initial cost of building and improvements	23,420,021
Cost Capitalized Subsequent to Acquisition	6,501,381
Carrying amount of land and land improvements	3,197,957
Carrying amount of building and improvements	29,362,814
Accumulated depreciation	6,807,019
Triple-net
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	335,554
Initial cost of land and land improvements	902,057
Initial cost of building and improvements	6,873,404
Cost Capitalized Subsequent to Acquisition	1,127,313
Carrying amount of land and land improvements	986,273
Carrying amount of building and improvements	7,881,025
Accumulated depreciation	1,719,431
Triple-net | Operating Segments
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	335,554
Initial cost of land and land improvements	902,057
Initial cost of building and improvements	6,873,404
Cost Capitalized Subsequent to Acquisition	1,127,313
Carrying amount of land and land improvements	986,273
Carrying amount of building and improvements	7,881,025
Accumulated depreciation	1,719,431
Outpatient Medical
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	89,089
Initial cost of land and land improvements	947,691
Initial cost of building and improvements	6,131,616
Cost Capitalized Subsequent to Acquisition	1,523,148
Carrying amount of land and land improvements	1,087,188
Carrying amount of building and improvements	7,512,662
Accumulated depreciation	2,099,813
Outpatient Medical | Operating Segments
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	89,089
Initial cost of land and land improvements	947,691
Initial cost of building and improvements	6,131,616
Cost Capitalized Subsequent to Acquisition	1,523,148
Carrying amount of land and land improvements	1,087,188
Carrying amount of building and improvements	7,512,662
Accumulated depreciation	2,099,813
Total continuing operating properties
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	2,467,223
Initial cost of land and land improvements	4,540,878
Initial cost of building and improvements	37,644,761
Cost Capitalized Subsequent to Acquisition	9,151,842
Carrying amount of land and land improvements	5,271,418
Carrying amount of building and improvements	45,976,221
Accumulated depreciation	10,626,263
Assets held for sale
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	7,506
Initial cost of building and improvements	55,491
Cost Capitalized Subsequent to Acquisition	36,150
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	51,866
Accumulated depreciation	$ 0