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Business and Property Management Agreements with RMR LLC - (Details) |  | 5 Months Ended | 12 Months Ended
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Jun. 05, 2015 | Jun. 05, 2015 shares | Dec. 31, 2016 USD ($) employee day | Dec. 31, 2016 USD ($) employee day | Dec. 31, 2016 USD ($) employee lease_agreement day | Dec. 31, 2016 USD ($) employee day management_agreement | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) shares
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of employees | employee |  |  | 0 | 0 | 0 | 0 |  |
Property management and construction supervision fees |  |  |  | $ 10,585,000 |  |  | $ 10,342,000 | $ 8,259,000
Property management and construction supervision fees paid |  |  |  | 9,061,000 |  |  | 7,021,000 | 5,289,000
Professional Fees |  |  |  | 235,000 |  |  | 256,000 | 278,000
RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Business management fees incurred |  |  |  | 36,763,000 |  |  | 34,949,000 | $ 30,794,000
Recognized amortization of the liability |  |  |  | 2,974,000 |  |  | 1,743,000 |
Common shares issued for the incentive fees | shares |  | 68,983 |  |  |  |  |  | 123,462
Related Party Transaction Business Management Agreement Incentive Fee Payable |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 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% |  |
Construction supervision fees payable under property management agreement as a percentage of construction costs |  |  | 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% |  |
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% |  |
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% |  |
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 |  |
Base management fee payable as a percentage of average market capitalization exceeding specified amount |  |  | 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 |  |
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% |  |
Incentive management fee payable (as a percent) |  |  | 12.00% | 12.00% | 12.00% | 12.00% |  |
Period of measurement |  |  | 3 years |  |  |  |  |
Period applicable in the case of calculation of the incentive management fee for 2015 |  |  | 2 years |  |  |  |  |
Shorter period applicable in the case of calculation of the incentive management fee for 2014 |  |  | 1 year |  |  |  |  |
Related Party Transaction, Incentive Management Fee Cap on Common Shares |  |  | 1.50% | 1.50% | 1.50% | 1.50% |  |
Related Party Transaction, Incentive Management Fee, Top Consecutive Trading Days | day |  |  | 10 | 10 | 10 | 10 |  |
Related Party Transaction, Incentive Management Fee, Consecutive Trading Days | day |  |  | 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 |  |  | $ 250,000,000 | $ 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 |  |
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 |  |  |  |  |

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