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Debt - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 03, 2024
USD ($)
day
$ / shares
Sep. 30, 2024
USD ($)
community
renewal_option
Sep. 30, 2024
USD ($)
community
renewal_option
Feb. 29, 2024
USD ($)
renewal_option
community
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
community
renewal_option
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
community
renewal_option
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Oct. 01, 2021
USD ($)
Credit Facilities [Line Items]                      
Total long-term debt   $ 3,706,022,000 $ 3,706,022,000     $ 3,706,022,000   $ 3,706,022,000   $ 3,697,313,000  
Loss on extinguishment of debt           $ (2,267,000) $ 0 $ (2,267,000) $ 0    
First Mortgage                      
Credit Facilities [Line Items]                      
Number of renewal options | renewal_option       2              
Term of renewal option (in years)       1 year              
Number of communities securing debt | community   16 16 11   16   16      
Mortgage Debt Due 2025                      
Credit Facilities [Line Items]                      
Outstanding mortgage debt     $ 197,100,000                
Mortgages                      
Credit Facilities [Line Items]                      
Debt face amount   $ 100,000,000 $ 100,000,000     $ 100,000,000   $ 100,000,000      
Number of renewal options | renewal_option   2 2     2   2      
Term of renewal option (in years)           1 year          
Percentage of total debt (as percent)   91.50% 91.50%     91.50%   91.50%      
Mortgage debt   $ 3,400,000,000 $ 3,400,000,000     $ 3,400,000,000   $ 3,400,000,000      
Total long-term debt   2,067,155,000 2,067,155,000     2,067,155,000   2,067,155,000   1,953,414,000  
Mortgages | First Mortgage                      
Credit Facilities [Line Items]                      
Debt face amount   $ 182,500,000 $ 182,500,000 $ 50,000,000   $ 182,500,000   $ 182,500,000      
Debt instrument, variable interest rate, type [extensible enumeration]       Secured Overnight Financing Rate (SOFR) [Member]              
Interest rate, stated percentage   5.67% 5.67%     5.67%   5.67%      
Term of interest     2 years                
Mortgages | First Mortgage | Variable Rate Component One                      
Credit Facilities [Line Items]                      
Applicable margin (as a percent)       3.50%              
Line of Credit | Fifth Amended and Restated Credit Agreement | Letter of Credit Sublimit                      
Credit Facilities [Line Items]                      
Letters of credit issued   $ 58,500,000 $ 58,500,000     $ 58,500,000   $ 58,500,000      
Line of Credit | Fifth Amended and Restated Credit Agreement | Letter of Credit                      
Credit Facilities [Line Items]                      
Letters of credit issued   15,700,000 15,700,000     15,700,000   15,700,000      
Credit facility, maximum borrowing capacity   17,000,000 17,000,000     17,000,000   17,000,000      
Line of Credit | Credit Agreement With Capital One, National Association | Revolving Credit Facility                      
Credit Facilities [Line Items]                      
Credit facility, maximum borrowing capacity   $ 100,000,000 $ 100,000,000     $ 100,000,000   $ 100,000,000      
Convertible Debt | Convertible Senior Notes Due 2026                      
Credit Facilities [Line Items]                      
Debt face amount                     $ 230,000,000
Interest rate, stated percentage   2.00% 2.00%     2.00%   2.00%     2.00%
Total long-term debt   $ 230,000,000 $ 230,000,000     $ 230,000,000   $ 230,000,000   $ 230,000,000  
Convertible Debt | Convertible Senior Notes Due 2026 | Subsequent Event                      
Credit Facilities [Line Items]                      
Debt instrument, face amount exchanged $ 206,700,000                    
Total long-term debt 23,300,000                    
Convertible Debt | Convertible Senior Notes Due 2029                      
Credit Facilities [Line Items]                      
Debt instrument, convertible, conversion ratio   0.1111111                  
Convertible Debt | Convertible Senior Notes Due 2029 | Subsequent Event                      
Credit Facilities [Line Items]                      
Debt face amount $ 369,400,000                    
Interest rate, stated percentage 3.50%                    
Debt instrument, face amount exchanged $ 219,400,000                    
Proceeds from issuance of debt 150,000,000                    
Debt instrument, indebtedness aggregate principal amount maximum $ 500,000,000                    
Threshold trading days | day 20                    
Threshold consecutive trading days | day 30                    
Threshold percentage of stock price trigger 130.00%                    
Threshold business days | day 5                    
Threshold consecutive trading days, measurement period | day 10                    
Percentage of product of the last reported sale price of the common stock and the conversion rate (as a percent) 98.00%                    
Percentage of common stock in excess shares 0.199                    
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 9.00                    
Cash proceeds $ 135,000,000                    
Convertible Debt | Convertible Senior Notes Due 2029 | Subsequent Event | Forecast                      
Credit Facilities [Line Items]                      
Loss on extinguishment of debt         $ 15,000,000.0