Property, Plant and Equipment and Leasehold Intangibles, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	$ 8,815,216		$ 8,815,216		$ 8,718,743
Accumulated depreciation and amortization	(3,975,573)		(3,975,573)		(3,814,451)
Property, plant and equipment and leasehold intangibles, net	4,839,643		4,839,643		4,904,292
Finance lease, right-of-use asset	315,400		315,400		332,300
Depreciation and amortization expense	86,600	$ 83,600	172,300	$ 167,500
Nonrecurring
Property, Plant and Equipment [Line Items]
Non-cash impairment charges	1,600	$ 600	2,100	$ 2,300
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	508,210		508,210		502,610
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	5,293,975		5,293,975		5,262,136
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	1,019,609		1,019,609		990,006
Resident and leasehold operating intangibles
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	301,732		301,732		303,737
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	58,387		58,387		51,037
Assets under financing leases and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	$ 1,633,303		$ 1,633,303		$ 1,609,217