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Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]
Revenues	$ 267,519	$ 255,275	$ 247,402	$ 228,577	$ 229,809	$ 216,873	$ 206,708	$ 191,497	$ 998,773	$ 844,887	$ 761,438
Net income	$ 9,544	$ 38,249	$ 36,387	$ 39,789	$ 45,288	$ 37,112	$ 37,659	$ 38,580	123,968	$ 158,637	$ 151,164
Per share data (basic and diluted):
Net income (in dollars per share)	$ 0.04	$ 0.16	$ 0.15	$ 0.18	$ 0.22	$ 0.18	$ 0.19	$ 0.21
Common distributions declared (in dollars per share)	$ 0.52	$ 0.39	$ 0.39	$ 0.39	$ 0.39	$ 0.39	$ 0.39	$ 0.39
Loss on distribution to common shareholders of The RMR Group Inc. common stock									$ (38,437)

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Amount of non cash loss, which represents difference between our carrying value and the fair value of the RMR Inc. shares on the distribution date.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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