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Related Person Transactions (Details) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Feb. 16, 2024 USD ($)	Feb. 02, 2023 $ / shares	Sep. 30, 2024 USD ($) agreement	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) agreement	Sep. 30, 2023 USD ($)	Mar. 20, 2023
Related person transactions
Revenues			$ 373,640	$ 356,524	$ 1,115,808	$ 1,048,773
Rental income
Related person transactions
Revenues			61,635	63,390	187,155	191,201
Reit Management And Research L L C | Rental income
Related person transactions
Revenues			$ 97	$ 58	354	$ 132
AlerisLife Inc
Related person transactions
Step acquisition, ownership percentage including subsequent acquisition	34.00%
Purchase price	$ 14,890
Related Party | Reit Management And Research L L C
Related person transactions
Related party transaction, closing cost					$ 6,080
Number of management agreements | agreement			2		2
AlerisLife Inc
Related person transactions
Investment owned balance per shares | $ / shares		$ 1.31
AlerisLife Inc | Related Party
Related person transactions
Investment owned, percentage of total shares outstanding							31.90%
Diversified Healthcare Trust | ABP Trust And Adam D. Portnoy
Related person transactions
Noncontrolling interest, ownership percentage by parent			9.80%		9.80%
AlerisLife Inc | AlerisLife Inc
Related person transactions
Noncontrolling interest, ownership percentage by parent							6.10%
AlerisLife Inc | ABP Trust
Related person transactions
Ownership interest by parent	66.00%

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