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Business and Property Management Agreements with RMR LLC (Details) $ in Thousands |  | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 05, 2015 | Jun. 05, 2015 shares | Dec. 31, 2017 USD ($) employee day | Dec. 31, 2017 USD ($) employee day | Dec. 31, 2017 USD ($) employee day | Dec. 31, 2017 USD ($) lease_agreement employee day | Dec. 31, 2017 USD ($) employee day management_agreement | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of employees | employee |  |  | 0 | 0 | 0 | 0 | 0 |  |
Recognized amortization of the liability |  |  |  | $ 798 |  |  |  | $ 798 | $ 402
Property management and construction supervision fees |  |  |  | 10,919 |  |  |  | 10,585 | 10,342
Property management and construction supervision fees paid |  |  |  | 9,993 |  |  |  | 9,061 | 7,021
Professional Fees |  |  |  | 275 |  |  |  | 235 | 256
RMR LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Business management fees incurred |  |  |  | 38,638 |  |  |  | 36,763 | 34,949
Recognized amortization of the liability |  |  |  | 2,974 |  |  |  | 2,974 | 1,743
Common shares issued for the incentive fees | shares |  | 68,983,000 |  |  |  |  |  |  |
Related Party Transaction Business Management Agreement Incentive Fee Payable |  |  | $ 55,740 | $ 55,740 | $ 55,740 | $ 55,740 | $ 55,740 | $ 0 | $ 0
Period over which transition services will be provided by the related party after termination of the agreement |  |  | 120 days |  |  |  |  |  |
MOBs | RMR LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Base business management fee payable in cash (as a percent) |  |  | 3.00% | 3.00% | 3.00% | 3.00% | 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% |  |
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 | $ 250,000 | $ 250,000 | $ 250,000 | $ 250,000 |  |
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 | $ 250,000 | $ 250,000 | $ 250,000 | $ 250,000 |  |
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 |  |  |  |  |  |
Related Party Transaction, Incentive Management Fee Cap on Common Shares |  |  | 1.50% | 1.50% | 1.50% | 1.50% | 1.50% |  |
Related Party Transaction, Incentive Management Fee, Top Consecutive Trading Days | day |  |  | 10 | 10 | 10 | 10 | 10 |  |
Related Party Transaction, Incentive Management Fee, Consecutive Trading Days | day |  |  | 30 | 30 | 30 | 30 | 30 |  |
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 | $ 250,000 | $ 250,000 | $ 250,000 | $ 250,000 |  |
Base management fee payable, average market capitalization |  |  | $ 250,000 | $ 250,000 | $ 250,000 | $ 250,000 | $ 250,000 |  |
Maximum | Amended Agreement | RMR LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related Party Transaction, Incentive Management Fee Reduction, Total Return Per Share, Basis Spread |  |  |  |  | 5.00% |  |  |  |
Maximum | Amended Agreement | RMR LLC | Up C Transaction |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Termination fee term |  |  | 20 years |  |  |  |  |  |
Minimum | Amended Agreement | RMR LLC |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related Party Transaction, Incentive Management Fee Reduction, Total Return Per Share, Basis Spread |  |  |  |  | 2.00% |  |  |  |
Minimum | Amended Agreement | RMR LLC | Up C Transaction |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Termination fee term |  |  | 19 years |  |  |  |  |  |

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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 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 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 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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- 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 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 paid to related parties. + 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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- Definition A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.2(a),(b),(c),(d)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section 45 -Paragraph 3 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849 + Details
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