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Fair Value Measurements - Additional Information (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
lease
community
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable securities $ 108,039,000   $ 68,567,000
Line of credit 166,381,000   0
Debt $ 3,727,556,000   3,555,123,000
Number of communities leased | lease 239    
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Marketable securities $ 108,000,000.0    
Nonrecurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Operating lease, right of use assets impairment charge 65,700,000 $ 0  
Property, plant and equipment and leasehold intangibles impairment charge $ 11,000,000.0 $ 0  
Condensed Consolidated Balance Sheet      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Number of communities leased | community 35    
Estimated fair value $ 106,700,000    
Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate 11.20%    
Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate 12.30%    
Line of Credit | Fourth Amended and Restated Credit Agreement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Line of credit $ 166,400,000    
Line of Credit | Fifth Amended and Restated Credit Agreement      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Line of credit 166,400,000    
Long-term debt and lines of credit      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt 3,900,000,000   $ 3,600,000,000
Independent Living      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Operating lease, right of use assets impairment charge (31,300,000)    
Assisted Living and Memory Care      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Operating lease, right of use assets impairment charge (22,200,000)    
CCRC Ventures, LLC      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Operating lease, right of use assets impairment charge $ (12,200,000)