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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 19, 2018	Jan. 02, 2018	Nov. 16, 2017	Dec. 31, 2017	Sep. 30, 2017
Class A common shares
Class of Stock [Line Items]
Common stock shares outstanding (in shares)				15,164,066	15,164,066
Class A and B-1 common shares
Class of Stock [Line Items]
Dividends paid (in dollars per share)			$ 0.25
Value of dividends			$ 4,041
Common stock shares outstanding (in shares)			16,164,066
ABP Trust | Class A common shares
Class of Stock [Line Items]
Value of dividends			$ 3,750
Common stock shares outstanding (in shares)				15,000,000
RMR LLC
Class of Stock [Line Items]
Dividends paid (in dollars per share)			$ 0.25
Value of dividends			$ 7,791
Subsequent event | Class A and B-1 common shares
Class of Stock [Line Items]
Value of dividends	$ 4,041
Dividends declared (in dollars per share)	$ 0.25
Common stock shares outstanding (in shares)	16,162,338
Subsequent event | ABP Trust | Class A common shares
Class of Stock [Line Items]
Value of dividends	$ 3,750
Subsequent event | RMR LLC
Class of Stock [Line Items]
Value of dividends	$ 7,791
Dividends declared (in dollars per share)	$ 0.25
Former employees | Subsequent event | Class A common shares
Class of Stock [Line Items]
Adjustment related to tax withholding for share based compensation		$ 103
Former employees | Subsequent event | RMR LLC | Class A common shares
Class of Stock [Line Items]
Shares acquired through withholding process (in shares)		1,728

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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Amount of paid and unpaid cash dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

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