Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Two Mortgage Notes Payable Two Mortgage Notes Payable [Member] Two Mortgage Notes Payable Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Net income used in calculating diluted EPS Net Income (Loss) Available to Common Stockholders, Diluted Equity Method Investments Equity Method Investments [Member] Carrying Value Reported Value Measurement [Member] Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus The RMR Group LLC Redeemable Noncontrolling Interest [Member] Redeemable Noncontrolling Interest Adjustment to Compensation, Amount Adjustment to Compensation Amount Segment Reporting [Abstract] Adam Portnoy Adam Portnoy [Member] Adam Portnoy Common stock Common Stock, Value, Issued State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Add back: income attributable to unvested participating securities Incremental Common Shares Attributable To Dilutive Effect Of Contingently Issuable Shares, Income (Loss) Attributable To Unvested Participating Securities Incremental Common Shares Attributable To Dilutive Effect Of Contingently Issuable Shares, Income (Loss) Attributable To Unvested Participating Securities Line of Credit Line of Credit [Member] ABP Trust and Managed REIT Abp Trust And Managed Reit [Member] Represents information pertaining to ABP Trust and Managed REIT's. Restatement Determination Date Restatement Determination Date Derivative Instrument [Axis] Derivative Instrument [Axis] Schedule of Income Tax Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Loans Held for Investment, Net Financing Receivables [Text Block] Construction supervision revenues Construction Supervision Revenues [Member] Construction Supervision Revenues Amendment Flag Amendment Flag Current liabilities: Liabilities, Current [Abstract] Consolidated Entities [Axis] Consolidated Entities [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 2016 Plan 2016 Omnibus Equity Plan [Member] 2016 Omnibus Equity Plan [Member] Number of joint ventures owned Number Of Joint Ventures Number Of Joint Ventures Income from loan investments, net Net Investment Income Capital contributions from noncontrolling interests Proceeds from Contributed Capital Reimbursable compensation and benefits Reimbursement, Payroll Related And Other Costs [Member] Reimbursement, Payroll Related And Other Costs [Member] Cumulative common distributions Cumulative Dividends Abp Trust Abp Trust [Member] Represents information pertaining to ABP Trust. Purchase of property and equipment Payments to Acquire Other Property, Plant, and Equipment Related Person Transactions Related Party Transactions Disclosure [Text Block] Consolidated Entities [Domain] Consolidated Entities [Domain] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province RMR LLC RMR LLC [Member] RMR LLC [Member] PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Asset Acquisition [Axis] Asset Acquisition [Axis] Notional Amount Derivative, Notional Amount Weighted average common shares outstanding - basic (in shares) Weighted average common shares outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Other private entities Other Private Entities [Member] Other Private Entities Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Capital contributions Noncontrolling Interests, Increase From Contributed Capital Noncontrolling Interests, Increase From Contributed Capital Number of reportable segments Number of Reportable Segments RMR Inc. franchise tax expense and interest income RMR Inc. franchise tax expense and interest income Franchise Tax Expense And Interest Income The Amount of franchise tax expense and interest income. Total current liabilities Liabilities, Current Sonesta Sonesta International Hotels Corporation [Member] Represents the information pertaining to the acquisition of Sonesta International Hotels Corporation. Related Party And Nonrelated Party Related Party And Nonrelated Party [Member] Related Party And Nonrelated Party Allowance for credit losses, current Financing Receivable, Allowance for Credit Loss, Current Less: unvested participating securities and incremental impact of weighted average (in shares) Weighted Average Number of Shares Outstanding, Basic, Unvested Participating Securities Weighted Average Number of Shares Outstanding, Basic, Unvested Participating Securities Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Interest income Interest and Other Income OPI Office Properties Income Trust [Member] Office Properties Income Trust [Member] Residential Community, Greenwich Residential Community, Greenwich [Member] Residential Community, Greenwich Entity Address, City or Town Entity Address, City or Town Purchase price Asset Acquisition, Consideration Transferred Investments Investments Equity Method Investments, Fair Value Disclosure Class A Membership Units Capital Unit, Class A [Member] Receivables [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Title of Individual [Domain] Title and Position [Domain] Due from related parties, net of current portion Other Receivable, after Allowance for Credit Loss, Noncurrent Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Intangible assets, net of accumulated amortization of $12,171 and $9,074, respectively Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net income used in calculating basic EPS Net Income (Loss) Available to Common Stockholders, Basic RMR Residential RMR Residential [Member] RMR Residential Transferrable Rights Offering Transferrable Rights Offering [Member] Transferrable Rights Offering Capital Unit, Class [Domain] Capital Unit, Class [Domain] Level 2 Fair Value, Inputs, Level 2 [Member] Receivable [Domain] Receivable [Domain] Accumulated amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Parent Company Parent Company [Member] Less: unrealized gain on derivatives attributable to noncontrolling interest in The RMR Group LLC, net of tax expense of $117, $0, $117 and $0, respectively Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Noncontrolling Interest Subsequent Event Type [Axis] Subsequent Event Type [Axis] Residential Fund Residential Fund [Member] Residential Fund Unrealized gain on derivatives, net of tax expense of $251, $0, $251 and $0, respectively Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Property and equipment accrued, not paid Capital Expenditures Incurred but Not yet Paid Common shares outstanding (in shares) Weighted Average Number of Shares Issued, Basic Incentive fees Incentive business management revenues Management Service, Incentive [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Liability related to tax receivable agreement Tax Receivable Agreement Obligations, Current and Noncurrent Represents the carrying amount on the reporting date of the current and non current obligations relating to the tax receivable agreement. Other comprehensive income attributable to The RMR Group Inc., net of tax expense of $134, $0, $134 and $0, respectively Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Tremont Reality Capital Tremont Reality Capital [Member] Tremont Reality Capital Other Consolidated Entities Nonredeemable Noncontrolling Interest [Member] Nonredeemable Noncontrolling Interest Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Debt outstanding Carrying value Long-Term Debt Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Document Period End Date Document Period End Date Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Amortization expense related to other assets Amortization Of Other Assets The noncash expense relating to amortization of assets not otherwise specified and charged against earnings. RMR LLC Subsidiaries [Member] Principal balance Debt Instrument, Face Amount Shareholders’ Equity Equity [Text Block] Expenses: Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Other comprehensive income attributable to The RMR Group Inc., tax Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Other impairment loss Equity Method Investment, Other-than-Temporary Impairment Cumulative other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Class B-1 Common Stock Common Class B [Member] Changes in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Operating lease liabilities Operating Lease, Liability, Current Mortgage notes payable Mortgages [Member] Statement of Comprehensive Income [Abstract] Per Common Share Amounts Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Secured financing facility, net of current portion Secured Long-Term Debt, Noncurrent Document Fiscal Period Focus Document Fiscal Period Focus Financing receivable, number of loans Financing Receivable, Number Of Loans Financing Receivable, Number Of Loans Other reimbursable expenses Reimbursed Expense Reimbursed Expense Rental property revenues Lease Income Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Discount rates Measurement Input, Discount Rate [Member] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Denominators: Weighted Average Number of Shares Outstanding, Basic [Abstract] Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Less: unrealized gain on derivatives attributable to noncontrolling interest, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Noncontrolling Interest Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Loans held for investment, net of allowance for credit losses of $0 and $63, respectively Financing Receivable, after Allowance for Credit Loss, Current Net income attributable to noncontrolling interest in The RMR Group LLC Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable SEVN Seven Hills Realty Trust [Member] Seven Hills Realty Trust Current portion of secured financing facility, net Secured Debt, Current Due from related parties related to equity based payment awards Other Receivables, Related Party, Fair Value Disclosure Other Receivables, Related Party, Fair Value Disclosure Payment for investments Payments to Acquire Interest in Subsidiaries and Affiliates Asset Class [Domain] Asset Class [Domain] Uncertain tax position reserve, net of federal benefit Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Credit Facility [Domain] Credit Facility [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Related Party Transactions [Abstract] Related Party Transactions [Abstract] Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Due from related parties Other Receivables, Net, Current Compensation Amount Outstanding Recovery Compensation Amount MF Fund VII MF Fund VII [Member] MF Fund VII Individual: Individual [Axis] Weighted average common shares outstanding - diluted (in shares) Weighted average common shares outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Joint Venture Joint Venture [Member] Joint Venture Dividends paid (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Disposal Group Name [Domain] Disposal Group Name [Domain] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Payments for common stock Payments For Common Stock Payments For Common Stock Carroll MF VII, LLC Carroll MF VII, LLC [Member] Carroll MF VII, LLC Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Net income attributable to RMR Inc. before income tax expense Income (Loss) from Continuing Operations before Income Taxes This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes. Entities [Table] Entities [Table] Mortgage Receivable Mortgage Receivable [Member] Operating expenses paid in The RMR Group Inc. common shares Noncash Expense Paid in Common Stock Noncash Expense Paid in Common Stock Amounts due pursuant to tax receivable agreement, net of current portion Tax Receivable Agreement Obligations, Noncurrent Represents the carrying amount on the reporting date of the non current obligations relating to the tax receivable agreement. Proceeds from secured financing facility Proceeds from Secured Lines of Credit Total Other Receivables Raleigh, NC mortgage loan Raleigh, NC Mortgage Loan Interest Rate Cap [Member] Raleigh, NC Mortgage Loan Interest Rate Cap Distributions paid Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid Award Timing Predetermined Award Timing Predetermined [Flag] Repayments of revolving credit facility Repayments of Unsecured Debt Separation costs Severance Costs Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] State income tax expense State and Local Income Tax Expense (Benefit), Continuing Operations Total Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Additional hares received as percentage of outstanding shares Additional Shares Received As Percentage Of Outstanding Shares, Performance Metrics Additional Shares Received As Percentage Of Outstanding Shares, Performance Metrics Add: Incremental unvested shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Share awards, net Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture Add back: net income attributable to noncontrolling interest in The RMR Group LLC Incremental Common Shares Attributable To Dilutive Effect Of Contingently Issuable Shares, Income (Loss) Attributable To Noncontrolling Interest Incremental Common Shares Attributable To Dilutive Effect Of Contingently Issuable Shares, Income (Loss) Attributable To Noncontrolling Interest Shares Purchased Outside of Rights Offering Shares Purchased Outside of Rights Offering [Member] Shares Purchased Outside of Rights Offering All Executive Categories All Executive Categories [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Tax distributions to member Distribution Made to Limited Liability Company (LLC) Member, Tax Distributions Distribution Made to Limited Liability Company (LLC) Member, Tax Distributions Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Secured financing facility Long-Term Debt, Fair Value Noncontrolling interest in The RMR Group LLC Redeemable Noncontrolling Interest, Equity, Carrying Amount Plan Name [Domain] Plan Name [Domain] Asset Acquisition [Domain] Asset Acquisition [Domain] Operating lease right of use assets Operating Lease, Right-of-Use Asset Reclassifications over the next 12 months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] ILPT ILPT Industrial Logistics Properties Trust [Member] Industrial Logistics Properties Trust [Member] Secured revolving credit facility Long-Term Line of Credit Distributions to common shareholders Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] CARROLL Multifamily Venture VII, LP CARROLL Multifamily Venture VII, LP [Member] CARROLL Multifamily Venture VII, LP Total revenues from unrelated parties Nonrelated Party [Member] Contributions, net of receivable Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Schedule of Net Income Attributable to Parent Net Income Attributable to Parent [Table Text Block] Tabular disclosure relating to net income attributable to parent. Class B-2 Common Stock Common Class B2 [Member] Classification of common stock that has different rights than Common Class A and B1 representing ownership interest in a corporation. Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Distributions to noncontrolling interests Payments to Noncontrolling Interests, Dividends and Tax Distributions Payments to Noncontrolling Interests, Dividends and Tax Distributions Common stock, shares authorized (in shares) Common Stock, Shares Authorized Private Capital Clients Private Capital Clients [Member] Private Capital Clients Shares received as percentage of outstanding shares Shares Received As Percentage Of Outstanding Shares Shares Received As Percentage Of Outstanding Shares Net Income Attributable to RMR Inc. Net Income (Loss) Attributable to Parent Disclosure [Text Block] The entire disclosure for net income (loss) attributable to parent. Exercise Price Award Exercise Price Cash Flows from Investing Activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Related Party Transaction [Axis] Related Party Transaction [Axis] Advisory services Advisory services revenues Investment Advisory, Management and Administrative Service [Member] Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Accounts receivable Accounts Receivable, after Allowance for Credit Loss Indebtedness Debt Disclosure [Text Block] Common class A and B1 Common Class And B1 [Member] Classification of combined common stock (A and B1) that has different rights than Common Class B representing ownership interest in a corporation. Two Floating Rate Mortgage Loans Two Floating Rate Mortgage Loans [Member] Two Floating Rate Mortgage Loans Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Investments Equity Method Investments Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Changes in fair value for our investment in Fund VII Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Measurement Input Type [Domain] Measurement Input Type [Domain] Secured financing facility Secured Debt [Member] Loans held for investment Loans Receivable, Fair Value Disclosure Proceeds from sale of loan investments Proceeds from Sale, Loan and Lease, Held-for-Investment Sale of stock transaction Sale of Stock, Consideration Received on Transaction Adoption Date Trading Arrangement Adoption Date Investment in residential fund Payments to acquire equity method investments Payments to Acquire Equity Method Investments Common share distributions Dividends, Common Stock, Cash Total shareholders’ equity Equity, Attributable to Parent Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Member distributions upon sale of 260 Woodstock Payments of Capital Distribution Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Construction supervision fee percentage Construction Supervision Fee Percentage Construction Supervision Fee Percentage Residential Community, Sunrise, FL Residential Community, Sunrise, FL [Member] Residential Community, Sunrise, FL Strike Rate Derivative, Cap Interest Rate Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Add: assumed redemption of noncontrolling interest’s Class A Units for Class A common shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements Number of properties securing debt Number of Real Estate Properties, Collateral Number of Real Estate Properties, Collateral Prepaid and other current assets Prepaid Expense and Other Assets, Current Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] (Reversal of) provision for deferred income taxes Deferred Income Tax Expense (Benefit) Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Entity Central Index Key Entity Central Index Key Ownership percentage by related parties Ownership Percentage By Related Parties Ownership Percentage By Related Parties Accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional paid in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Add back: income tax expense Incremental Common Shares Attributable To Dilutive Effect Of Contingently Issuable Shares, Income Tax Expense (Benefit) Incremental Common Shares Attributable To Dilutive Effect Of Contingently Issuable Shares, Income Tax Expense (Benefit) Equity: Equity, Attributable to Parent [Abstract] Capital deployment volatility Measurement Input, Capital Deployment Volatility [Member] Measurement Input, Capital Deployment Volatility Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Deferred tax asset Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Number of units acquired Asset Acquisition, Number Of Units Acquired Asset Acquisition, Number Of Units Acquired Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code Cumulative Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Name Forgone Recovery, Individual Name Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Capital Unit Redeemable Class A Units Capital Unit Redeemable Class [Member] Redeemable Class A of capital units, which are a type of ownership interest in a corporation. Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Reimbursable equity based compensation Reimbursement, Client Company Equity Based Conpensation [Member] Reimbursement, Client Company Equity Based Conpensation Statement [Line Items] Statement [Line Items] Total assets Assets Membership units (in shares) Common Unit, Outstanding Entity [Domain] Entity [Domain] Total compensation and benefits expense Employee Benefits and Share-Based Compensation Exit capitalization rates Measurement Input, Capitalization Rates [Member] Measurement Input, Capitalization Rates Interest expense Total amount of interest expense presented in the consolidated statements of comprehensive income Interest Expense, Nonoperating PEO PEO [Member] Net income before noncontrolling interest Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Net This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest net of incentive fee allocable to related party. Equity based compensation expense Share-Based Payment Arrangement, Expense Measurement Basis [Axis] Measurement Basis [Axis] Proceeds from sale of loans Proceeds from Sale, Loan, Held-for-Investment Noncontrolling interest in other consolidated entities Noncontrolling Interest in Variable Interest Entity Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Loans held for investment, net of allowance for credit losses of $0 and $526, respectively Financing Receivable, after Allowance for Credit Loss, Noncurrent Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings Retained Earnings [Member] Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Total expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] Net loss attributable to other noncontrolling interests Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Increase (Decrease) in Shareholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Schedule of Financial Instruments Not Carried at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Net income attributable to The RMR Group Inc. per common share - diluted (in usd per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Prepaid and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Unrealized gain on derivatives, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Rental property acquisitions Payments to Acquire Real Estate Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Number of managed trusts Number Of Managed Real Estate Investment Trusts Number Of Managed Real Estate Investment Trusts Ownership [Domain] Ownership [Domain] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Employer compensation liability, net of current portion Deferred Compensation Liability, Classified, Noncurrent Cash Flows from Financing Activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total management, incentive and advisory services revenues Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net of accumulated depreciation of $15,276 and $7,980, respectively Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Line of credit facility, unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Tax receivable agreement, percent of payment Tax Receivable Agreement Payment Percent 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. Shares issued, price (in usd per share) Shares Issued, Price Per Share Ownership percentage Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Managed Equity REITs and SEVN Managed Equity REITs and SEVN [Member] Managed Equity REITs and SEVN Investment in joint ventures Payments to Acquire Interest in Joint Venture Other comprehensive income: Other Comprehensive Income (Loss), Tax [Abstract] Numerators: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Interest rate caps Derivative Asset Shares repurchased Stock Repurchased During Period, Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Class B Membership Units Capital Unit, Class B [Member] Fair Value Estimate of Fair Value Measurement [Member] Revenue Recognition Revenue from Contract with Customer [Text Block] Transaction and acquisition related (recoveries) costs Transaction And Acquisition Related Costs, Operating Expense Transaction And Acquisition Related Costs, Operating Expense Current portion of liability related to tax receivable agreement Tax Receivable Agreement Obligations, Current Tax Receivable Agreement Obligations, Current Cumulative Common Distributions Accumulated Distributions in Excess of Net Income [Member] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Sale of Stock [Axis] Sale of Stock [Axis] Title of Individual [Axis] Title and Position [Axis] Current portion of Earnout liability Business Combination, Contingent Consideration, Liability, Current All Trading Arrangements All Trading Arrangements [Member] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating (loss) income Operating Income (Loss) Schedule of Dividends Declared Dividends Declared [Table Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Revenue Recognition [Abstract] Revenue Recognition [Abstract] Shares owned (in shares) Investment Owned, Balance, Shares Offering price per share (in usd per share) Offering Price Per Share Offering Price Per Share Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Employer compensation liability related to equity based payment awards Other Payables, Related Party, Fair Value Disclosure Other Payables, Related Party, Fair Value Disclosure Related Party Transaction [Domain] Related Party Transaction [Domain] Former Nonexecutive Officer Former Nonexecutive Officer [Member] Former Nonexecutive Officer [Member] Shares repurchased (in shares) Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends declared (in usd per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Capital contributions Employees Made Capital Contributions Employees Made Capital Contributions Member distributions upon sale of 260 Woodstock Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders DHC Diversified Healthcare Trust [Member] Diversified Healthcare Trust [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Beginning Balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Entity Information [Line Items] Entity Information [Line Items] OPI Management OPI Management [Member] OPI Management Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Related Party Total revenues from related parties Related Party [Member] Class of Stock [Line Items] Class of Stock [Line Items] Termination term Business Management Fee, Subject To Termination, Term Business Management Fee, Subject To Termination, Term Class A Common Stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Compensation and benefits Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Gain on sale of real estate Gain on sale of real estate Gains (Losses) on Sales of Investment Real Estate GOV and Select Income REIT GOV and Select Income REIT [Member] GOV and Select Income REIT Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Entity Small Business Entity Small Business Comprehensive income attributable to The RMR Group Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Reimbursable costs Reimbursable Costs, Related Parties Reimbursable Costs, Related Parties Income taxes computed at the federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Reimbursable accounts payable and accrued expenses Other Liabilities, Current Agreement term Business Management Fee, Agreement Term Business Management Fee, Agreement Term Other assets, net of accumulated amortization of $71,786 and $97,156, respectively Other Assets, Noncurrent Document Type Document Type Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value at Derivative Asset, Current Loss on extinguishment of debt Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Net income attributable to noncontrolling interest Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Basis of Presentation Significant Accounting Policies [Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Loss on impairment of other assets Intangible Asset, Excluding Goodwill, Impairment Loss Management services Management Service [Member] Arrangement Duration Trading Arrangement Duration Unlevered IRR Measurement Input, Unlevered Internal Rate of Return [Member] Measurement Input, Unlevered Internal Rate of Return Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Number of shares purchased (in shares) Equity Method Investment, Number of Shares Purchased, Investment Equity Method Investment, Number of Shares Purchased, Investment Income before income tax expense Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies Commitments and Contingencies Total revenues Revenues Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Gain (loss) on investments (Gain) loss on investments Income (Loss) from Equity Method Investments Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Receivable Type [Axis] Receivable Type [Axis] Liabilities and Equity Liabilities and Equity [Abstract] Schedule of Assets and Liabilities Measured at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Perpetual Capital: Perpetual Capital Managed Public Real Estate Capital [Member] Managed Public Real Estate Capital Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Amount of gain reclassified from cumulative other comprehensive income (loss) into interest expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Supplemental Disclosures: Supplemental Cash Flow Information [Abstract] Accumulated amortization Other Assets, Accumulated Amortization Other Assets, Accumulated Amortization PEO Name PEO Name Income taxes paid Income Tax Paid, before Refund Received Up C Transaction Up C Transaction [Member] Information pertaining to the related party Up-C Transaction. Repayments of secured financing facility Repayments of Secured Debt Allowance for credit losses, noncurrent Financing Receivable, Allowance for Credit Loss, Noncurrent Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Due from related parties Increase (Decrease) in Due from Related Parties Entity Tax Identification Number Entity Tax Identification Number Earnout Liability Measurement Input Business Combination, Contingent Consideration, Liability, Measurement Input UBS Master Repurchase Agreement UBS Master Repurchase Agreement [Member] UBS Master Repurchase Agreement Legal Entity [Axis] Legal Entity [Axis] Amount of gain recognized on derivatives in other comprehensive income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Mortgage notes payable, net Notes Payable Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Total Managed Equity REITs Managed Equity R E I T [Member] Represents information pertaining to related party transactions with Managed Equity REITs. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Ownership percentage Equity Method Investment, Ownership Percentage Equity based compensation Share-Based Payment Arrangement, Noncash Expense Disposal Group Name [Axis] Disposal Group Name [Axis] Equity severance costs Severance Costs, Equity Severance Costs, Equity Investment, Name [Domain] Investment, Name [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Net income attributable to The RMR Group Inc. per common share - basic (in usd per share) Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Repurchase of common shares Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Sunrise JV Sunrise JV [Member] Sunrise JV Award Type Award Type [Axis] Acquisition fee revenue Asset Acquisition, Transaction Expense Asset Acquisition, Transaction Expense Payment of deferred financing fees Payments of Financing Costs Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Change in fair value of Earnout liability Change in fair value of Earnout liability Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Number of shares owned (in shares) Equity Method Investment, Number of Shares Owned Equity Method Investment, Number of Shares Owned Capital Units by Class [Axis] Capital Units by Class [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common shares Common Stock [Member] Earnout liability Earnout liability Business Combination, Contingent Consideration, Liability Fair Value Measurement [Domain] Fair Value Measurement [Domain] Permanent items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Income tax expense, estimate tax rate (percent) Income Tax Expense (Benefit), Estimate Tax Rate Income Tax Expense (Benefit), Estimate Tax Rate Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Rental property expenses Rental Property Expense Rental Property Expense Total liabilities and equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Total noncontrolling interests Equity, Attributable to Noncontrolling Interest Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Plan Name [Axis] Plan Name [Axis] Membership Units Membership Units [Member] Membership Units Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Total Shareholders' Equity Parent [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] General and administrative General and Administrative Expense Adjustment to Compensation: Adjustment to Compensation [Axis] Property management revenues Property Management Revenues [Member] Property Management Revenues Net income attributable to noncontrolling interest in The RMR Group LLC Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Extinguishment of debt, amount Extinguishment of Debt, Amount Less: income attributable to unvested participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Net Income Attributable to RMR Inc. NA Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other, net Other Noncash Income (Expense) Consolidation of investments Noncontrolling Interest, Increase from Business Combination Debt Instrument [Line Items] Debt Instrument [Line Items] Residential Community, Pompano Beach, FL Residential Community, Pompano Beach, FL [Member] Residential Community, Pompano Beach, FL Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Committed capital Investment Company, Committed Capital Additional funding of loan investments Payment for Acquisition, Loan, Held-for-Investment Schedule of EPS, basic Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block] Total reimbursable costs Revenue Not from Contract with Customer SVC Service Properties Trust [Member] Service Properties Trust [Member] Name Trading Arrangement, Individual Name Private Capital: Private Capital Managed Private Real Estate Capital [Member] Managed Private Real Estate Capital Cash and cash equivalents Cash and Cash Equivalent Holding period Measurement Input, Expected Term [Member] Other reimbursable expenses Reimbursements, Other [Member] Reimbursements, Other [Member] Lease expense Operating Lease, Expense Company Selected Measure Amount Company Selected Measure Amount Distributions from investments Proceeds from Equity Method Investment, Distribution Monte Carlo Valuation Technique, Monte Carlo [Member] Valuation Technique, Monte Carlo Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Debt instrument, term of extension Debt Instrument, Term of Extension Debt Instrument, Term of Extension Federal income tax expense Federal Income Tax Expense (Benefit), Continuing Operations Entity Address, Address Line Three Entity Address, Address Line Three Entity Address, Address Line Two Entity Address, Address Line Two Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Equity Measurement Input Equity Securities, FV-NI, Measurement Input Interest Rate Cap Interest Rate Cap [Member] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Recognition of right of use assets and related lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income tax expense Income tax expense Income Tax Expense (Benefit) Reimbursable accounts payable and accrued expenses Increase (Decrease) in Incentive Fee Due to Related Party Increase (Decrease) in Incentive Fee Due to Related Party Award Timing Method Award Timing Method [Text Block] Decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Property management fee, percent fee Property Management Fee, Percent Fee Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income attributable to The RMR Group Inc. Net income attributable to The RMR Group Inc. Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Schedule of EPS, diluted Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Discounted cash flow Valuation Technique, Discounted Cash Flow [Member] Proceeds from sale of property Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Less: income tax expense assuming redemption of noncontrolling interest’s Class A units for Class A common shares Income Tax Expense (Benefit), Redemption Of Noncontrolling Interest Income Tax Expense (Benefit), Redemption Of Noncontrolling Interest Restatement Determination Date: Restatement Determination Date [Axis] Value of dividends Dividend, Share-Based Payment Arrangement, Cash Proceeds from mortgage notes payable Proceeds from Notes Payable Base business management revenues Management Service, Base [Member] Borrowings on revolving credit facility Proceeds from Unsecured Lines of Credit RMR, Inc RMR, Inc [Member] RMR, Inc Revenues: Revenues [Abstract] Cash severance costs Severance Costs, Cash Severance Costs, Cash Orlando, FL mortgage loan Orlando, FL Mortgage Loan, Interest Rate Cap [Member] Orlando, FL Mortgage Loan, Interest Rate Cap Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]