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Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands										9 Months Ended
	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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Aggregate dividends declared during the period for each share of common stock outstanding.

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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).

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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).

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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.

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