XML 67 R51.htm IDEA: XBRL DOCUMENT
v3.20.2

Related Person Transactions - Purchase TA shares (Details) - TA - RMR LLC - USD ($) $ in Thousands | Sep. 30, 2020 | Jul. 06, 2020 | Oct. 10, 2018
--- | --- | --- | ---
Related Party Transaction [Line Items] |  |  |
Share purchase from related party (in shares) | 104,738 | 218,577 | 298,538
Purchase from related party | $ 2,259 | $ 3,060 | $ 8,382
Number of shares owned (in shares) | 621,853 |  |
Ownership percentage | 4.30% |  |

X
- Definition Equity Method Investment, Number of Shares Owned + References No definition available. + Details
Name: | rmr_EquityMethodInvestmentNumberofSharesOwned
Namespace Prefix: | rmr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Related Party Transaction, Purchases From Related Party, Shares + References No definition available. + Details
Name: | rmr_RelatedPartyTransactionPurchasesFromRelatedPartyShares
Namespace Prefix: | rmr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_OwnershipAxis=rmr_TravelCentersOfAmericaLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=rmr_RMRLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |