Fair Value Measurements - Narrative (Details) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 17, 2024 USD ($) community	Sep. 30, 2024 community	Dec. 31, 2023 USD ($) community	Dec. 31, 2024 USD ($) community lease	Dec. 31, 2023 USD ($) community	Dec. 31, 2022 USD ($) community	Oct. 03, 2024 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities			$ 29,755	$ 19,879	$ 29,755
Total long-term debt			3,697,313	4,062,787	3,697,313
Long-term debt, fair value			3,400,000	$ 3,800,000	3,400,000
Number of communities leased | lease				227
Number of communities acquired | community	11
Welltower Inc. and JV
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of communities acquired | community		11
4.92% Fixed Rate Agency Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long-term debt	$ 188,600
4.92% Fixed Rate Agency Debt | Welltower Inc. and JV
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt assumed	$ 194,500
Interest rate (as percent)	4.92%
2029 Notes at initial conversion rate | Convertible notes payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value							$ 362,200
Interest rate (as percent)							3.50%
Debt face amount							$ 369,400
HCA Healthcare, Inc. | Health Care Services
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value			27,400		27,400
Non-cash impairment charge			$ 26,000
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating lease right-of-use assets				$ 4,600	8,300	$ 13,700
Property, plant and equipment and leasehold intangibles, net				$ 4,000	$ 6,300	$ 15,900
Condensed Consolidated Balance Sheet
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of communities leased | community			12	22	12	8
Estimated fair value			$ 16,400	$ 7,300	$ 16,400	$ 30,900
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total long-term debt			3,700,000	4,100,000	3,700,000
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities			29,800	19,900	29,800
Level 2 | Interest Rate Cap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated asset fair value (included in other assets, net)			13,300	$ 4,100	13,300
Level 2 | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated asset fair value (included in other assets, net)			$ 1,600		$ 1,600