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Shareholders’ Equity - Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended
	Nov. 17, 2016	Aug. 18, 2016	May 19, 2016	Dec. 15, 2015	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common distributions declared (in dollars per share)					$ 0.25	$ 0.2993	$ 0	$ 0.5260	$ 0	$ 0	$ 0	$ 0
Class A common shares
Class of Stock [Line Items]
Dividends paid (in dollars per share)				$ 0.5260
Common stock shares outstanding					15,082,432				15,000,000
Common class A and B1
Class of Stock [Line Items]
Dividends paid (in dollars per share)		$ 0.25	$ 0.2993		$ 0.25	$ 0.25	$ 0.25
Value of dividends		$ 4,002	$ 4,791	$ 8,416
Common stock shares outstanding			16,007,500	16,000,000
RMR LLC
Class of Stock [Line Items]
Dividends paid (in dollars per share)			$ 0.2993
Value of dividends		$ 7,752	$ 9,280	$ 16,306
Common distributions declared (in dollars per share)		$ 0.25
ABP Trust | Class A common shares
Class of Stock [Line Items]
Value of dividends		$ 3,750	$ 4,489	$ 7,890
Common stock shares outstanding			15,000,000
Subsequent Event | Common class A and B1
Class of Stock [Line Items]
Dividends paid (in dollars per share)	$ 0.25
Value of dividends	$ 4,021
Common stock shares outstanding	16,082,432
Subsequent Event | RMR LLC
Class of Stock [Line Items]
Value of dividends	$ 7,771
Common distributions declared (in dollars per share)	$ 0.25
Subsequent Event | ABP Trust | Class A common shares
Class of Stock [Line Items]
Value of dividends	$ 3,750

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
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-SubTopic 10
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