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Business and Property Management Agreements with RMR LLC (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) day lease_agreement management_agreement employee | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |
Number of employees | employee | 0 |  |
Professional fees | $ 13,373,000 | $ 11,891,000 | $ 9,993,000
RMR LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Management agreement incentive fee payable | $ 40,642,000 | 55,740,000 |
Percentage of property management fees payable | 3.00% |  |
Construction supervision fees payable under property management agreement as a percentage of construction costs | 5.00% |  |
Business management fees incurred | $ 27,399,000 | 35,874,000 | 38,638,000
Recognized amortization of the liability | 2,974,000 | 2,974,000 | 2,974,000
Property management and construction supervision fees | 13,141,000 | 12,214,000 | 10,919,000
Amortization of liability related to property management and construction supervision fees | $ 797,000 | $ 797,000 | $ 798,000
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 | management_agreement | 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% |  |
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% |  |
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% |  |
Incentive management fee payable (as a percent) | 12.00% |  |
Period of measurement | 3 years |  |
Top consecutive trading days | day | 10 |  |
Consecutive trading days | day | 30 |  |
Management agreement incentive fee payable | $ 0 |  |
Incentive management fee cap on common shares | 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 |  |
Base management fee payable, average market capitalization | $ 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 number of management agreements the company would need to terminate for convenience before a termination fee is incurred. + References No definition available. + Details
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- Definition Represents the number of management agreements RMR LLC would need to terminate for good cause before a termination fee is incurred. + References No definition available. + Details
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- Definition Represents the number of management agreements the company would need to terminate for a performance reason before a termination fee is incurred. + References No definition available. + Details
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- Definition Represents the measurement periods ending with the year for which the incentive management fee is being calculated. + References No definition available. + Details
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- Definition Represents the amount of amortization of the liability recorded during the period. + References No definition available. + Details
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- Definition Related Party Transaction Amortization Of Liability Related To Property Management And Construction Supervision Fees + References No definition available. + Details
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- Definition Represents the base management fees payable as a percentage of aggregate book value of real estate assets or transferred assets. + References No definition available. + Details
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- Definition Represents the base management fee payable as a percentage of average closing price per share of common shares on NYSE. + References No definition available. + Details
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- Definition Represents the base management fees payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments exceeding specified amount. + References No definition available. + Details
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- Definition Represents the base management fees payable as a percentage of average historical cost of real estate investments, excluding transferred assets for investments up to specified amount. + References No definition available. + Details
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- Definition Represents the base management fee payable as a percentage of average market capitalization exceeding specified amount. + References No definition available. + Details
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- Definition Represents the amount of average market capitalization for payment of base management fee. + References No definition available. + Details
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- Definition Represents the threshold amount of average market capitalization for payment of the base management fee. + References No definition available. + Details
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- Definition Represents the threshold amount of other real estate investments for payment of base management fee. + References No definition available. + Details
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- Definition Represents the threshold amount of real estate investments for payment of base management fee. + References No definition available. + Details
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- Definition Represents the incentive fee payable to related parties under the business management agreement. + References No definition available. + Details
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- Definition Represents the business management fees incurred pursuant to business management agreement with related parties. + References No definition available. + Details
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- Definition Related Party Transaction, Incentive Management Fee Cap on Common Shares + References No definition available. + Details
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- Definition Related Party Transaction, Incentive Management Fee Reduction, Total Return , Basis Spread + References No definition available. + Details
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- Definition Related Party Transaction, Incentive Management Fee, Top Consecutive Trading Days + References No definition available. + Details
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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 number of business days notice for termination of property management agreement by the related party for convenience. + References No definition available. + Details
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Balance Type: | na
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- Definition Represents the incentive management fee payable as a percentage of the product of the entity's equity market capitalization and its share price appreciation plus dividends. + References No definition available. + Details
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- Definition Related Party Transaction, Percentage Of Property Management Fees Payable Of Gross Collected Rent + References No definition available. + Details
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- Definition Represents the period over which the related party agrees to provide certain transition services following an applicable termination of the agreement. + References No definition available. + Details
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- Definition Represents the construction supervision fees payable to related parties under property management agreement expressed as a percentage of construction costs. + References No definition available. + Details
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- Definition Represents the number of consecutive renewal terms of agreement that the entity has the option to renew. + References No definition available. + Details
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- Definition Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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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- Definition Represents the term 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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