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Related Person Transactions - Accounting for Investment in RMR Inc (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 05, 2015 | Sep. 30, 2015 | Sep. 30, 2015
Up C Transaction | RMR LLC |  |  |
Related person transactions |  |  |
Amount of investment acquired | $ 60,700 |  |
RMR Inc | RMR LLC | Operating expense |  |  |
Related person transactions |  |  |
Amortization of other liabilities to reduce business and property management fees |  |  | $ 1,202
RMR Inc | Up C Transaction |  |  |
Related person transactions |  |  |
Fair value of investment | 136,278 |  |
Investment at carrying value, including transaction costs | $ 138,839 |  |
RMR Inc | Up C Transaction | RMR Inc |  |  |
Related person transactions |  |  |
Initial other liabilities |  | $ 76,648 | $ 76,648
RMR Inc | Up C Transaction | RMR LLC |  |  |
Related person transactions |  |  |
Straight line discount amortization period | 20 years |  |
RMR Inc | Up C Transaction | RMR LLC | General and administrative expense |  |  |
Related person transactions |  |  |
Amortization of other liabilities to reduce business and property management fees |  | $ 959 |
Class A common shares | RMR Inc | Up C Transaction |  |  |
Related person transactions |  |  |
Number of shares acquired | 5,272,787 |  |

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