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Related Person Transactions (Details) $ in Thousands				3 Months Ended		9 Months Ended
	Jul. 15, 2025 USD ($)	Feb. 14, 2025 USD ($)	Feb. 16, 2024 USD ($)	Sep. 30, 2025 USD ($) agreement	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) agreement	Sep. 30, 2024 USD ($)
Related person transactions
Total residents fees and services				$ 388,706	$ 373,640	$ 1,158,282	$ 1,115,808
Rental income
Related person transactions
Total residents fees and services				55,316	61,635	169,041	187,155
RMR LLC | Rental income
Related person transactions
Total residents fees and services				$ 102	$ 97	311	$ 354
RMR LLC | Related Party
Related person transactions
Related party transaction, closing cost						$ 4,050
Number of management agreements | agreement				2		2
AlerisLife Inc
Related person transactions
Step acquisition, ownership percentage including subsequent acquisition			34.00%
Purchase price			$ 15,459
AlerisLife Inc
Related person transactions
Payments of dividends	$ 10,000	$ 50,000
AlerisLife Inc | Diversified Healthcare Trust
Related person transactions
Payments of dividends	$ 3,400	$ 17,000
Diversified Healthcare Trust | ABP Trust And Adam D. Portnoy
Related person transactions
Noncontrolling interest, ownership percentage by parent				9.80%		9.80%
AlerisLife Inc | ABP Trust
Related person transactions
Ownership interest by parent			66.00%

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