Business and Property Management Agreements with RMR (Details)	1 Months Ended		12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) employee property lease agreement jointVenture	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 28, 2022	Mar. 31, 2017
Related Party Transaction
Number of employees | employee			0
Professional fees			$ 12,901,000	$ 13,161,000	$ 13,805,000
Number of medical office and life science properties | property			10
RMR
Related Party Transaction
Number of joint venture arrangements | jointVenture			2
Joint Venture | Seaport Innovation LLC
Related Party Transaction
Additional equity joint venture percentage	10.00%	35.00%
Equity method investment ownership percentage	20.00%	20.00%	10.00%	20.00%		20.00%	55.00%
Joint Venture | The LSMD Fund REIT LLC
Related Party Transaction
Equity method investment ownership percentage			20.00%
Reit Management And Research
Related Party Transaction
Number of medical office and life science properties | property			10
RMR
Related Party Transaction
Business management fees incurred			$ 16,646,000	$ 23,378,000	20,629,000
Recognized amortization of the liability			$ 2,974,000	2,974,000	2,974,000
Percentage of property management fees payable			3.00%
Construction supervision fees payable under property management agreement as a percentage of construction costs			5.00%
Property management and construction supervision fees			$ 10,329,000	12,504,000	13,802,000
Amortization of liability related to property management and construction supervision fees			797,000	797,000	797,000
Party transaction property management and construction supervision fees capitalized		$ 2,820,000	$ 4,672,000	2,820,000	3,718,000
Period over which transition services will be provided by the related party after termination of the agreement			120 days
RMR | Operating Expense
Related Party Transaction
Property management and construction supervision fees			$ 5,657,000	$ 9,684,000	$ 10,084,000
RMR | Senior Living Communities
Related Party Transaction
Number of consecutive renewal terms of agreement | agreement			2
RMR | Amended Agreement
Related Party Transaction
Base management fee payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments exceeding specified amount			0.50%
Base management fee payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments up to specified amount			0.70%
Threshold amount of other real estate investments for payment of base management fee			$ 250,000,000
Base management fee payable as a percentage of average market capitalization exceeding specified amount			0.50%
Threshold amount of average market capitalization for payment of base management fee			$ 250,000,000
Base management fee payable as a percentage of average closing price per share of common shares on NYSE			0.70%
Base management fee payable as a percentage of aggregate book value of real estate assets or transferred assets			0.50%
Incentive management fee payable (as a percent)			12.00%
Period of measurement			3 years
Top consecutive trading days			10 days
Consecutive trading days			30 days
Management agreement incentive fee payable			$ 0
Incentive management fee cap on common shares			1.50%
RMR | Amended Agreement | Up C Transaction
Related Party Transaction
Number of business days notice for termination of property management agreement for convenience by the related party			60 days
Window for providing notice of termination of property management agreement for performance by the related party			60 days
Window for providing notice of termination of property management agreement for change of control by the related party			12 months
Number of terminated management agreements for convenience before termination fee is incurred | lease			1
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred | lease			1
Number of terminated management agreements for a performance reason before termination fee is incurred | lease			1
Termination fee remaining term assumption			10 years
RMR | Minimum | Amended Agreement | Up C Transaction
Related Party Transaction
Termination fee term			19 years
RMR | Maximum
Related Party Transaction
Threshold amount of real estate investments for payment of base management fee			$ 250,000,000
Base management fee payable, average market capitalization			$ 250,000,000
RMR | Maximum | Amended Agreement | Up C Transaction
Related Party Transaction
Termination fee term			20 years
RMR | SNL US REIT Healthcare Index | Minimum | Amended Agreement
Related Party Transaction
Incentive management fee reduction, basis spread			2.00%
RMR | SNL US REIT Healthcare Index | Maximum | Amended Agreement
Related Party Transaction
Incentive management fee reduction, basis spread			5.00%