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Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  | 9 Months Ended
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Oct. 17, 2019 USD ($) $ / shares | Sep. 25, 2019 $ / shares shares | Sep. 18, 2019 $ / shares shares | Aug. 15, 2019 USD ($) | Jul. 03, 2019 $ / shares shares | May 21, 2019 trustee $ / shares shares | May 16, 2019 USD ($) | Apr. 05, 2019 $ / shares shares | Feb. 21, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  |  |  |  | 3,000 |  |  |  |  |
Common shares granted (in dollars per share) |  |  |  |  |  | $ 7.95 |  |  |  |  |
Number of independent trustees | trustee |  |  |  |  |  | 5 |  |  |  |  |
Distributions to shareholders | $ |  |  |  | $ 35,661 |  |  | $ 35,659 |  | $ 92,714 | $ 164,034 | $ 278,031
Officers And Other Employees of RMR LLC |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  | 187,500 |  |  |  |  |  |  |  |
Common shares granted (in dollars per share) |  |  | $ 8.71 |  |  |  |  |  |  |  |
Shares purchased for tax withholding and payment obligations | shares |  | 25,072 |  |  |  |  |  |  |  |  |
Stock repurchased during period (in dollars per share) |  | $ 9.33 |  |  |  |  |  |  |  |  |
Former Employees Of RMR LLC |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares purchased for tax withholding and payment obligations | shares |  |  |  |  | 2,912 |  |  | 3,529 |  |  |
Stock repurchased during period (in dollars per share) |  |  |  |  | $ 8.64 |  |  | $ 9.47 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions to common shareholders declared (in dollars per share) | $ 0.15 |  |  |  |  |  |  |  |  |  |
Distributions to shareholders | $ | $ 35,685 |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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