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Property, Plant and Equipment and Leasehold Intangibles, Net - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles $ 8,558,158 $ 8,346,845  
Accumulated depreciation and amortization (3,490,098) (3,237,011)  
Property, plant and equipment and leasehold intangibles, net 5,068,060 5,109,834  
Finance lease, right-of-use asset 400,000 600,000  
Depreciation and amortization expense for plant and equipment and leasehold intangibles 359,200 377,600 $ 444,300
Land      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles 505,298 450,894  
Buildings and improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles 5,215,460 4,790,769  
Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles 945,783 859,849  
Resident and leasehold operating intangibles      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles 307,071 317,111  
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles 61,491 80,729  
Assets under financing leases and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles $ 1,523,055 $ 1,847,493