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Related Person Transactions (Details) $ / shares in Units, $ in Thousands				12 Months Ended
	Feb. 14, 2025 USD ($)	Feb. 16, 2024 USD ($)	Feb. 02, 2023 $ / shares	Dec. 31, 2024 USD ($) agreement	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 20, 2023
Related Party Transaction
Revenues				$ 1,495,427	$ 1,410,308	$ 1,283,566
Rental income
Related Party Transaction
Revenues				251,038	258,400	260,740
RMR LLC \| Rental income
Related Party Transaction
Revenues				$ 460	$ 196	$ 303
AlerisLife Inc
Related Party Transaction
Step acquisition, ownership percentage including subsequent acquisition		34.00%
Purchase price		$ 15,459
Related Party \| RMR LLC
Related Party Transaction
Number of management agreements \| agreement				2
Related party transaction, closing cost				$ 4,056
AlerisLife Inc
Related Party Transaction
Investment owned balance per shares (in dollars per share) \| $ / shares			$ 1.31
AlerisLife Inc \| Related Party
Related Party Transaction
Investment owned, percentage of total shares outstanding							31.90%
AlerisLife Inc \| Subsequent Event
Related Party Transaction
Payments of dividend	$ 50,000
AlerisLife Inc \| Subsequent Event \| Diversified Healthcare Trusts
Related Party Transaction
Payments of dividend	$ 17,000
RMR LLC \| Year one
Related Party Transaction
Award vesting rights, percentage				20.00%
RMR LLC \| Year two
Related Party Transaction
Award vesting rights, percentage				20.00%
RMR LLC \| Year three
Related Party Transaction
Award vesting rights, percentage				20.00%
RMR LLC \| Year four
Related Party Transaction
Award vesting rights, percentage				20.00%
RMR LLC \| Year five
Related Party Transaction
Award vesting rights, percentage				20.00%
Diversified Healthcare Trusts \| ABP Trust and Adam D. Portnoy
Related Party Transaction
Noncontrolling interest, ownership percentage by parent				9.80%
AlerisLife Inc \| AlerisLife Inc
Related Party Transaction
Noncontrolling interest, ownership percentage by parent							6.10%
AlerisLife Inc \| ABP Trust
Related Party Transaction
Ownership interest by parent		66.00%