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Business and Property Management Agreements with RMR LLC (Details) |  | 12 Months Ended
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Jun. 05, 2015 | Dec. 31, 2018 USD ($) day employee | Dec. 31, 2018 USD ($) day employee | Dec. 31, 2018 USD ($) day employee | Dec. 31, 2018 USD ($) day lease_agreement employee | Dec. 31, 2018 USD ($) day management_agreement employee | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of employees | employee |  | 0 | 0 | 0 | 0 | 0 |  |
Professional fees |  |  | $ 242,000 |  |  |  | $ 275,000 | $ 235,000
RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Management agreement incentive fee payable |  | $ 40,642,000 | $ 40,642,000 | $ 40,642,000 | $ 40,642,000 | $ 40,642,000 | 55,740,000 | 0
Percentage of property management fees payable |  |  |  | 3.00% |  |  |  |
Construction supervision fees payable under property management agreement as a percentage of construction costs |  | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% |  |
Business management fees incurred |  |  | $ 35,874,000 |  |  |  | 38,638,000 | 36,763,000
Recognized amortization of the liability |  |  | 2,974,000 |  |  |  | 2,974,000 | 2,974,000
Property management and construction supervision fees |  |  | 12,214,000 |  |  |  | 10,919,000 | 10,585,000
Amortization of liability related to property management and construction supervision fees |  |  | 798,000 |  |  |  | 798,000 | 798,000
Property management and construction supervision fees paid |  |  | 11,891,000 |  |  |  | 9,993,000 | 9,061,000
Payroll and related costs reimbursed |  |  |  |  |  |  |  |
Period over which transition services will be provided by the related party after termination of the agreement |  | 120 days |  |  |  |  |  |
Senior Living Communities | Five Star |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of consecutive renewal terms of agreement |  |  |  |  | 2 | 2 |  |
Amended Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Base management fee payable as a percentage of aggregate book value of real estate assets or transferred assets |  | 0.50% | 0.50% | 0.50% | 0.50% | 0.50% |  |
Amended Agreement | RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
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% | 0.50% | 0.50% | 0.50% | 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% | 0.70% | 0.70% | 0.70% | 0.70% |  |
Threshold amount of other real estate investments for payment of base management fee |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 |  |
Base management fee payable as a percentage of average market capitalization exceeding specified amount |  | 0.50% | 0.50% | 0.50% | 0.50% | 0.50% |  |
Threshold amount of average market capitalization for payment of base management fee |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 |  |
Base management fee payable as a percentage of average closing price per share of common shares on NYSE |  | 0.70% | 0.70% | 0.70% | 0.70% | 0.70% |  |
Incentive management fee payable (as a percent) |  | 12.00% | 12.00% | 12.00% | 12.00% | 12.00% |  |
Period of measurement |  | 3 years |  |  |  |  |  |
Top consecutive trading days | day |  | 10 | 10 | 10 | 10 | 10 |  |
Consecutive trading days | day |  | 30 | 30 | 30 | 30 | 30 |  |
Management agreement incentive fee payable |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |
Incentive management fee cap on common shares |  | 1.50% | 1.50% | 1.50% | 1.50% | 1.50% |  |
Amended Agreement | RMR LLC | Up C Transaction |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
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_agreement |  |  |  |  | 1 |  |  |
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred | lease_agreement |  |  |  |  | 1 |  |  |
Number of terminated management agreements for a performance reason before termination fee is incurred | lease_agreement |  |  |  |  | 1 |  |  |
Termination fee remaining term assumption |  | 10 years |  |  |  |  |  |
Maximum | RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Threshold amount of real estate investments for payment of base management fee |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 |  |
Base management fee payable, average market capitalization |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 |  |
Maximum | Amended Agreement | RMR LLC | Up C Transaction |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Termination fee term |  | 20 years |  |  |  |  |  |
Minimum | Amended Agreement | RMR LLC | Up C Transaction |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Termination fee term |  | 19 years |  |  |  |  |  |
SNL US REIT Healthcare Index | Maximum | Amended Agreement | RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Incentive management fee reduction, basis spread |  |  |  | 500.00% |  |  |  |
SNL US REIT Healthcare Index | Minimum | Amended Agreement | RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Incentive management fee reduction, basis spread |  |  |  | 200.00% |  |  |  |

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- Definition Represents the window or numbers of business days after any calendar year to provide notice for termination of property management agreement by the related party for performance reasons. + References No definition available. + Details
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- Definition Represents the window after a change in control to provide notice for termination of property management agreement by the related party. + References No definition available. + Details
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- Definition Represents the remaining term assumption in years used to calculate the fee for termination of one or both of the company's amended management agreements for a performance reason. + References No definition available. + Details
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