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Related Person Transactions - Accounting for Investment in RMR Inc (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 05, 2015 USD ($) agreement shares | May. 09, 2014 factor | Dec. 31, 2015 USD ($) | Dec. 31, 2013 USD ($) $ / shares | Dec. 23, 2013 USD ($)
RMR LLC |  |  |  |  |
Related person transactions |  |  |  |  |
Termination fee factor |  | 2.75 |  |  |
Number consecutive months for average fees and expenses |  | 24 months |  |  |
Termination of property management agreement in relation to business management agreement termination |  | 12 months |  |  |
Termination fee factor property management fee | factor |  | 12 |  |  |
Number of months used to calculate property management termination fee |  | 6 months |  |  |
Period over which transition services will be provided by the related party after termination of the agreement |  | 120 days |  |  |
Base management fee payable as a percentage of aggregate book value of real estate assets or transferred assets |  |  |  | 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% |
Base management fee payable as a percentage of historical cost of other real estate investments, excluding transferred assets for investments after specified amount |  |  |  | 0.50% |
Percentage of incentive fee payable |  |  |  | 15.00% |
Cap on the value of incentive fee | $ / shares |  |  |  | $ 0.02 |
Base management fee payable, average market capitalization |  |  |  | $ 250,000 |
RMR LLC | Maximum |  |  |  |  |
Related person transactions |  |  |  |  |
Threshold amount of real estate investments for payment of base management fee |  |  |  | 250,000 |
Base management fee payable, average market capitalization |  |  |  | $ 250,000 |
Up C Transaction | RMR LLC | RMR Inc |  |  |  |  |
Related person transactions |  |  |  |  |
Initial other liabilities |  |  | $ 77,850 |  |
RMR Inc | Up C Transaction |  |  |  |  |
Related person transactions |  |  |  |  |
Amount of investment acquired | $ 60,700 |  |  |  |
Fair value of investment | $ 136,278 |  |  |  |
RMR Inc | Up C Transaction | RMR Inc |  |  |  |  |
Related person transactions |  |  |  |  |
Straight line discount amortization period |  |  | 20 years |  |
RMR Inc | Up C Transaction | RMR Inc | General and administrative expense |  |  |  |  |
Related person transactions |  |  |  |  |
Amortization of other liabilities to reduce business and property management fees |  |  | $ 2,145 |  |
Class A common shares | RMR Inc | Up C Transaction |  |  |  |  |
Related person transactions |  |  |  |  |
Number of shares acquired | shares | 5,272,787 |  |  |  |
Amended Agreement |  |  |  |  |
Related person transactions |  |  |  |  |
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 person transactions |  |  |  |  |
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%
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 market capitalization exceeding specified amount |  |  |  | 0.50% |
Threshold amount of other real estate investments for payment of base management fee |  |  |  |  | $ 250,000
Threshold amount of average market capitalization for payment of base management fee |  |  |  | $ 250,000 |
Base management fee payable as a percentage of average closing price per share of common shares on NYSE |  |  |  |  | 0.70%
Amended Agreement | Up C Transaction | RMR LLC |  |  |  |  |
Related person transactions |  |  |  |  |
Period of prior written notice for termination of the service agreements by the related party |  | 120 years |  |  |
Period of prior written notice for termination of the service agreements by the related party before amendment |  | 60 years |  |  |
Number of business days notice for termination of either agreement by related party, if entity undergoes a change of control |  | 5 years |  |  |
Number of business days notice for termination of property management agreement for convenience by the related party | 60 days |  |  |  |
Number of business days notice for termination of property management agreement for performance 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 | agreement | 1 |  |  |  |
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred | agreement | 1 |  |  |  |
Number of terminated management agreements for a performance reason before termination fee is incurred | agreement | 1 |  |  |  |
Termination fee remaining term assumption | 10 years |  |  |  |
Amended Agreement | Up C Transaction | RMR LLC | Minimum |  |  |  |  |
Related person transactions |  |  |  |  |
Termination fee term | 19 years |  |  |  |
Amended Agreement | Up C Transaction | RMR LLC | Maximum |  |  |  |  |
Related person transactions |  |  |  |  |
Termination fee term | 20 years |  |  |  |

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