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Business and Property Management Agreements with RMR (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) employee agreement jointVenture lease property | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Related Party Transaction |  |  |
Number of employees | employee | 0 |  |
Professional fees | $ 14,587,000 | $ 12,901,000 | $ 13,161,000
Number of medical office and life science properties | property | 10 |  |
RMR |  |  |
Related Party Transaction |  |  |
Number of joint venture arrangements | jointVenture | 2 |  |
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 | $ 13,965,000 | 16,646,000 | 23,378,000
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 | $ 8,886,000 | 10,329,000 | 12,504,000
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 | $ 3,200,000 | 4,672,000 | 2,820,000
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 | $ 5,686,000 | $ 5,657,000 | $ 9,684,000
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% |  |

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