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Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 274,296 | $ 263,983 | $ 261,367 | $ 258,375 | $ 267,519 | $ 255,275 | $ 247,402 | $ 228,577 | $ 1,058,022 | $ 998,773 | $ 844,887
Net income | $ 42,885 | $ 27,903 | $ 39,233 | $ 31,272 | $ 9,544 | $ 38,249 | $ 36,387 | $ 39,789 | 137,234 | 123,968 | 153,184
Per share data (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Net income (in dollars per share) | $ 0.18 | $ 0.12 | $ 0.17 | $ 0.13 | $ 0.04 | $ 0.16 | $ 0.15 | $ 0.18 |  |  |
Common distributions declared (in dollars per share) | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.39 | $ 0.52 | $ 0.39 | $ 0.39 | $ 0.39 |  |  |
Loss on distribution to common shareholders of The RMR Group Inc. common stock |  |  |  |  | $ 38,437 |  |  |  | $ 0 | $ 38,437 | $ 0
Non-cash distribution (in dollars per share) |  |  |  |  | $ 0.13 |  |  |  |  |  |

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