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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 05, 2015 | Dec. 31, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Percent of gross collected rents |  |  |  | 3.00% |  |
Percent of construction supervision |  |  |  | 5.00% |  |
Property management fees revenue |  |  |  | $ 47,690 | $ 45,550 | $ 42,482
Equity based compensation expense and related reimbursements |  |  |  | 4,912 | 6,461 | 7,421
Due from related parties |  |  |  | 90,369 | 102,759 |
Other assets, net of amortization |  |  |  | $ 143,727 | 153,143 |
Managed Equity REITs |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Percentage of historical cost of transferred real estate assets |  |  |  | 0.50% |  |
Percentage of average invested capital below threshold limit |  |  |  | 0.70% |  |
Threshold amount, maximum |  |  |  | $ 250,000 |  |
Percentage of average invested capital above threshold limit |  |  |  | 0.50% |  |
Threshold limit, minimum |  |  |  | $ 250,000 |  |
Percentage of average market capitalization below threshold limit |  |  |  | 0.70% |  |
Percentage of average market capitalization above threshold limit |  |  |  | 0.50% |  |
Remaining term after termination (in years) |  |  |  | 10 years |  |
Aggregate annual base business management fees |  |  |  | $ 94,354 | 103,800 | 120,448
Incentive management fee percentage |  |  |  | 12.00% |  |
Aggregate incentive business management fees |  |  |  | $ 0 | 120,094 | 155,881
Due from related parties |  |  |  | $ 85,459 | 94,301 |
Cash and shares received from related party | $ 167,764 |  |  |  |  |
Other assets, net of amortization | $ 193,806 |  |  |  |  |
Managed Operators, ABP Trust and AIC |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Percentage of average invested capital above threshold limit |  |  |  | 0.50% |  |
Aggregate annual business management fees |  |  |  | $ 25,906 | 28,471 | 27,609
Incentive fee percentage condition 1 |  | 0.60% |  |  |  |
AIC |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Percent of total premiums paid |  |  | 3.00% |  |  |
Due from related parties |  |  |  | $ 7 | 7 |
Open End Fund |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Percent of net asset value |  |  |  | 1.00% |  |
Due from related parties |  |  |  | $ 0 | 4,567 |
Up C Transaction | Managed Equity REITs |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Amortization of other assets |  |  |  | $ 9,416 | 9,416 | 9,416
RMRM |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Advisory fee percentage based on daily managed assets |  |  |  | 0.85% |  |
RMR LLC | Up C Transaction |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Duration of written notice for convenience (in days) |  |  |  | 60 days |  |
Window after calendar year end for written notice (in days) |  |  |  | 60 days |  |
Duration of written notice after change of control (in months) |  |  |  | 12 months |  |
Tremont Advisors |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Incentive fee percentage condition 1 |  |  |  | 20.00% |  |
Incentive fee percentage condition 2 |  |  |  | 7.00% |  |
Incentive fee percentage condition 1 |  |  |  | 1.50% |  |
Minimum | Tremont Advisors |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Advisory fee percentage based on aggregate principal amounts of loan originated |  |  |  | 0.50% |  |
Maximum | Tremont Advisors |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Advisory fee percentage based on aggregate principal amounts of loan originated |  |  |  | 1.00% |  |
Advisory services |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues |  |  |  | $ 2,911 | 3,169 | 4,352
Advisory services | RMR Advisors and Tremont Advisors |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 2,767 | 3,013 | 2,888
Advisory services | Tremont Advisors |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 144 | 156 | 1,464
Management services |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 168,766 | 178,075 | 191,594
Management services | Tremont Advisors |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 816 | 194 | 1,055
Reimbursable compensation and benefits |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 57,256 | 57,490 | 53,152
Other client company reimbursable expenses |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 360,572 | 354,540 | $ 0
Other client company reimbursable expenses | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 360,572 | 354,540 |
Due from related parties |  |  |  | $ 56,079 | $ 65,909 |

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