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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018
Income Tax Contingency [Line Items] |  |  |
Income taxes computed at the federal statutory rate | 24.53% | 35.00% |
Income tax expense | $ 48,343 | $ 15,673 |
Federal income tax expense | 37,730 | 12,744 |
State income tax expense | $ 10,613 | $ 2,929 |
Net income attributable to RMR Inc. per common share - basic (in dollars per share) | $ 4.40 | $ 1.46 |
Tax receivable agreement remeasurement | $ 24,710 | $ 0 |
Adjustment For Tax Cuts And Jobs Act [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Income tax expense | $ 19,817 |  |
Net income attributable to RMR Inc. per common share - basic (in dollars per share) | $ 1.23 |  |
Forecast |  |  |
Income Tax Contingency [Line Items] |  |  |
Income taxes computed at the federal statutory rate |  |  | 24.50%

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