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Related Person Transactions - Tax Related Payments (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Tax receivable agreement remeasurement		$ 24,710	$ 0
Tax receivable agreement remeasurement (in dollars per share)		$ 1.53
RMR LLC
Related Party Transaction [Line Items]
Tax distributions		$ 16,333	8,123
ABP Trust | RMR LLC
Related Party Transaction [Line Items]
Tax distributions		$ 15,155	7,577
ABP Trust | Up C Transaction
Related Party Transaction [Line Items]
Tax receivable agreement, percent of payment		85.00%
Liability related to Tax Receivable Agreement		$ 37,288
ABP Trust | Up C Transaction | Forecast
Related Party Transaction [Line Items]
Payments related to Tax Receivable Agreement	$ 2,935
ABP Trust and Managed REIT | RMR LLC
Related Party Transaction [Line Items]
Tax distributions		$ 31,488	$ 15,700

X

- Definition

Payments to Related Party, Tax Receivable Agreement

+ References

No definition available.

+ Details

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Namespace Prefix:	rmr_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the carrying amount on the reporting date of the current and non current obligations relating to the tax receivable agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	rmr_
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Balance Type:	credit
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X

- Definition

Represents the percent of cash savings, if any, in US Federal, state and local income tax or franchise tax provided in the Tax Receivable Agreement with a related party.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Tax Receivable Agreement Revaluation

+ References

No definition available.

+ Details

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X

- Definition

Tax Receivable Agreement Revaluation, Per Share

+ References

No definition available.

+ Details

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X

- Definition

Amount of cash distribution paid to unit-holder of limited liability company (LLC).

+ 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)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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