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Shareholders' Equity - Share Award Plans (Details) | 1 Months Ended | 12 Months Ended
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May 31, 2016 USD ($) trustee shares | Sep. 30, 2015 USD ($) shares | May 31, 2015 USD ($) trustee shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) trustee $ / shares shares
Share award plans |  |  |  |  |  |
Number of trustees | trustee | 5 |  | 5 |  |  | 5
Share-based compensation expense | $ |  |  |  | $ 2,195,000 | $ 1,373,000 | $ 1,914,000
Share Award Plans |  |  |  |  |  |
Share award plans |  |  |  |  |  |
Remaining common shares available for issuance |  |  |  | 2,567,616 |  |
Estimated future compensation for the unvested shares | $ |  |  |  | $ 2,904,000 |  |
Closing share price (in dollars per share) | $ / shares |  |  |  | $ 18.93 |  |
Weighted average period over which the compensation expense will be recorded |  |  |  | 1 year 8 months 12 days |  |
Number of Shares |  |  |  |  |  |
Unvested shares at the beginning of the year |  |  |  | 158,874 | 153,478 | 150,711
Shares granted |  |  |  | 92,150 | 99,000 | 94,200
Shares vested |  |  |  | (97,614) | (93,604) | (91,433)
Unvested shares at the end of the year |  |  |  | 153,410 | 158,874 | 153,478
Weighted Average Grant Date Fair Value |  |  |  |  |  |
Unvested shares at the beginning of the year (in dollars per share) | $ / shares |  |  |  | $ 19.39 | $ 23.39 | $ 23.84
Shares granted (in dollars per share) | $ / shares |  |  |  | 21.18 | 16.30 | 21.83
Shares vested (in dollars per share) | $ / shares |  |  |  | 21.09 | 16.17 | 21.87
Unvested shares at the end of the year (in dollars per share) | $ / shares |  |  |  | $ 19.92 | $ 19.39 | $ 23.39
Scheduled to vest unvested shares |  |  |  |  |  |
2017 |  |  |  | 60,040 |  |
2018 |  |  |  | 46,050 |  |
2019 |  |  |  | 31,390 |  |
2020 |  |  |  | 15,930 |  |
Share Award Plans | Trustees |  |  |  |  |  |
Share award plans |  |  |  |  |  |
Common shares awarded | 2,500 | 2,500 | 2,500 |  |  | 2,500
Aggregate market value of shares awarded | $ |  | $ 41,000 |  |  |  | $ 306,000
Market value of shares awarded to each Trustee | $ |  |  |  |  |  | $ 61,000
Share Award Plans | RMR LLC | Officers and Employees |  |  |  |  |  |
Share award plans |  |  |  |  |  |
Common shares awarded |  |  |  | 79,650 | 84,000 | 81,700
Aggregate market value of shares awarded | $ | $ 228,000 |  | $ 252,000 | $ 1,724,000 | $ 1,321,000 | $ 1,750,000
Market value of shares awarded to each Trustee | $ | $ 46,000 |  | $ 50,000 |  |  |
Award vesting period |  |  |  | 5 years |  |

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- Definition Represents the market value of shares, newly issued during the reporting period under the plan, to each individual. + References No definition available. + Details
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- Definition Represents the number of trustees who have been granted shares under equity compensation plan. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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