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Related Person Transactions (Details) $ in Thousands			3 Months Ended
	Feb. 14, 2025 USD ($)	Feb. 16, 2024 USD ($)	Mar. 31, 2025 USD ($) agreement	Mar. 31, 2024 USD ($)
Related person transactions
Revenues			$ 386,864	$ 370,776
Rental income
Related person transactions
Revenues			58,558	62,650
RMR LLC | Rental income
Related person transactions
Revenues			107	$ 109
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
AlerisLife Inc
Related person transactions
Payments of dividends	$ 50,000
AlerisLife Inc | Diversified Healthcare Trust
Related person transactions
Payments of dividends	$ 17,000
Diversified Healthcare Trust | ABP Trust And Adam D. Portnoy
Related person transactions
Noncontrolling interest, ownership percentage by parent			9.80%
AlerisLife Inc | ABP Trust
Related person transactions
Ownership interest by parent		66.00%

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