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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | Jan. 19, 2018 | Jan. 02, 2018 | Nov. 16, 2017 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | --- | --- | ---
Class A common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock shares outstanding (in shares) |  |  |  | 15,164,066 | 15,164,066
Class A and B-1 common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid (in dollars per share) |  |  | $ 0.25 |  |
Value of dividends |  |  | $ 4,041 |  |
Common stock shares outstanding (in shares) |  |  | 16,164,066 |  |
ABP Trust | Class A common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Value of dividends |  |  | $ 3,750 |  |
Common stock shares outstanding (in shares) |  |  |  | 15,000,000 |
RMR LLC |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Dividends paid (in dollars per share) |  |  | $ 0.25 |  |
Value of dividends |  |  | $ 7,791 |  |
Subsequent event | Class A and B-1 common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Value of dividends | $ 4,041 |  |  |  |
Dividends declared (in dollars per share) | $ 0.25 |  |  |  |
Common stock shares outstanding (in shares) | 16,162,338 |  |  |  |
Subsequent event | ABP Trust | Class A common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Value of dividends | $ 3,750 |  |  |  |
Subsequent event | RMR LLC |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Value of dividends | $ 7,791 |  |  |  |
Dividends declared (in dollars per share) | $ 0.25 |  |  |  |
Former employees | Subsequent event | Class A common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Adjustment related to tax withholding for share based compensation |  | $ 103 |  |  |
Former employees | Subsequent event | RMR LLC | Class A common shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares acquired through withholding process (in shares) |  | 1,728 |  |  |

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