Property, Plant and Equipment and Leasehold Intangibles, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	$ 8,626,283		$ 8,626,283		$ 8,346,845
Accumulated depreciation and amortization	(3,369,915)		(3,369,915)		(3,237,011)
Property, plant and equipment and leasehold intangibles, net	5,256,368		5,256,368		5,109,834
Finance lease, right-of-use asset	400,000		400,000		600,000
Depreciation and amortization expense	93,200	$ 93,200	183,900	$ 189,300
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	507,336		507,336		450,894
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	5,257,530		5,257,530		4,790,769
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	935,755		935,755		859,849
Resident and leasehold operating intangibles
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	316,704		316,704		317,111
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	60,653		60,653		80,729
Assets under financing leases and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles	$ 1,548,305		$ 1,548,305		$ 1,847,493