Debt - Narrative (Details)	1 Months Ended	9 Months Ended
	Feb. 28, 2025 USD ($) community renewal_option	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Credit Facilities [Line Items]
Current portion of long-term debt		$ 104,018,000	$ 40,779,000
Long-term debt, less current portion		4,159,357,000	$ 4,022,008,000
Mortgage Debt Due 2025
Credit Facilities [Line Items]
Current portion of long-term debt		36,000,000
Long-term debt, less current portion		$ 98,800,000
Term of renewal option (in years)		1 year
Mortgage Debt Due 2035
Credit Facilities [Line Items]
Number of communities securing debt | community	5
Mortgage Debt Due 2030
Credit Facilities [Line Items]
Term of renewal option (in years)	1 year
Number of communities securing debt | community	36
Applicable margin (as a percent)	3.00%
Number of renewal options | renewal_option	2
Mortgage Debt Due 2029
Credit Facilities [Line Items]
Number of communities securing debt | community	11
Outstanding mortgage debt	$ 50,000,000
Mortgages
Credit Facilities [Line Items]
Percentage of total debt (as percent)		88.10%
Mortgage debt		$ 3,800,000,000
Mortgages | Mortgage Debt Due 2035
Credit Facilities [Line Items]
Debt face amount	$ 130,100,000
Interest rate, stated percentage	6.47%
Term of interest	5 years
Mortgages | Mortgage Debt Due 2030
Credit Facilities [Line Items]
Debt face amount	$ 161,000,000
Term of interest	3 years
Line of Credit | Fifth Amended and Restated Credit Agreement | Letter of Credit Sublimit
Credit Facilities [Line Items]
Letters of credit issued		1,900,000
Line of Credit | Fifth Amended and Restated Credit Agreement | Letter of Credit
Credit Facilities [Line Items]
Letters of credit issued		68,900,000
Credit facility, maximum borrowing capacity		85,000,000
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