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Related Person Transactions (Details) $ in Thousands				3 Months Ended		6 Months Ended
	Jul. 15, 2025 USD ($)	Feb. 14, 2025 USD ($)	Feb. 16, 2024 USD ($)	Jun. 30, 2025 USD ($) agreement	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) agreement	Jun. 30, 2024 USD ($)
Related person transactions
Total residents fees and services				$ 382,712	$ 371,392	$ 769,576	$ 742,168
Rental income
Related person transactions
Total residents fees and services				55,167	62,870	113,725	125,520
RMR LLC | Rental income
Related person transactions
Total residents fees and services				$ 102	$ 148	209	$ 257
AlerisLife Inc
Related person transactions
Step acquisition, ownership percentage including subsequent acquisition			34.00%
Purchase price			$ 15,459
Related Party | RMR LLC
Related person transactions
Related party transaction, closing cost						$ 4,056
Number of management agreements | agreement				2		2
AlerisLife Inc
Related person transactions
Payments of dividends		$ 50,000
AlerisLife Inc | Subsequent Event
Related person transactions
Payments of dividends	$ 10,000
AlerisLife Inc | Diversified Healthcare Trust
Related person transactions
Payments of dividends		$ 17,000
AlerisLife Inc | Diversified Healthcare Trust | Subsequent Event
Related person transactions
Payments of dividends	$ 3,400
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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