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Shareholders' Equity (Details) $ / shares in Units, $ in Thousands									1 Months Ended			9 Months Ended
	Sep. 26, 2015 $ / shares shares	Sep. 24, 2015 $ / shares shares	Sep. 02, 2015 $ / shares shares	Aug. 20, 2015 USD ($) $ / shares	May. 21, 2015 USD ($) $ / shares	May. 19, 2015 item $ / shares shares	Apr. 24, 2015 USD ($) $ / shares	Feb. 24, 2015 USD ($) $ / shares	Jun. 30, 2015 shares	Feb. 28, 2015 USD ($) shares	Apr. 30, 2014 USD ($) shares	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)
Distributions
Distribution to common shareholders (in dollars per share) | $ / shares				$ 0.39	$ 0.39		$ 0.39	$ 0.39
Distribution to common shareholders | $				$ 92,585	$ (91,655)		$ 92,614	$ 79,530				$ 263,770	$ 226,252
Common shares issued in public offering										31,050,000	15,525,000
Net proceeds after underwriting discounts from issuance of common shares issued in public offering | $										$ 659,496	$ 322,807	$ 659,496	$ 322,962
Number of shares granted under the award plan	2,500		84,000			2,500
Closing share price of the entity's common shares (in dollars per share) | $ / shares	$ 16.26		$ 15.73			$ 20.14
Number of trustees | item						5
RMR LLC
Distributions
Shares issued in connection with acquisition												81,557
Certain Our Officers And Employees Of RMR LLC
Distributions
Shares purchased from certain of our officers and other employees of RMR LLC		13,113
Closing share price of the entity's common shares (in dollars per share) | $ / shares		$ 16.19
RMR LLC
Distributions
Shares issued in connection with acquisition									2,345,000

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