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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 16, 2020 | Mar. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Scheduled to vest unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 1,388 | $ 2,224 | $ 2,155 |
Common distributions declared (in dollars per share) |  |  | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 |  |  |  |
Distributions to shareholders |  |  |  |  |  |  |  |  |  |  | $ (199,719) | $ (370,746) | $ (370,608) |
Certain Our Officers And Employees Of RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares purchased from certain of our officers and other employees of RMR LLC (in shares) |  |  |  |  |  |  |  |  |  |  | 31,747 | 22,999 | 17,170 |
Share Award Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining common shares available for issuance (in shares) |  |  | 2,214,932 |  |  |  |  |  |  |  | 2,214,932 |  |  |
Number of unvested shares (in shares) |  |  | 227,340 |  |  |  | 161,990 |  |  |  | 227,340 | 161,990 | 148,010 | 153,410
Scheduled to vest unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 (in shares) |  |  |  |  |  |  |  |  |  |  | 73,080 |  |  |
2020 (in shares) |  |  |  |  |  |  |  |  |  |  | 63,840 |  |  |
2021 (in shares) |  |  |  |  |  |  |  |  |  |  | 53,520 |  |  |
2022 (in shares) |  |  |  |  |  |  |  |  |  |  | 36,900 |  |  |
Estimated future compensation for the unvested shares |  |  | $ 2,423 |  |  |  |  |  |  |  | $ 2,423 |  |  |
Weighted average period over which the compensation expense will be recorded |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Share Award Plans | Trustees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares awarded (in shares) |  | 3,000 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate market value of shares awarded |  | $ 47 |  |  |  |  |  |  |  |  |  |  |  |
Share Award Plans | RMR LLC | Officers and Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares awarded (in shares) |  |  |  |  |  |  |  |  |  |  | 187,500 | 105,800 | 88,100 |
Aggregate market value of shares awarded |  |  |  |  |  |  |  |  |  |  | $ 1,633 | $ 2,022 | $ 1,743 |
Award vesting period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Share Award Plans | RMR LLC | Trustees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares awarded (in shares) |  |  |  |  |  |  |  |  |  |  | 3,000 | 3,000 | 3,000 |
Aggregate market value of shares awarded |  |  |  |  |  |  |  |  |  |  | $ 119 | $ 248 | $ 319 |
Market value of shares awarded to each Trustee |  |  |  |  |  |  |  |  |  |  | $ 24 | $ 50 | $ 64 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common distributions declared (in dollars per share) | $ 0.15 |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to shareholders | $ (35,684) |  |  |  |  |  |  |  |  |  |  |  |  |

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