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Shareholders' Equity (Details) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 14, 2015 USD ($) $ / shares | Sep. 24, 2015 $ / shares shares | Jun. 05, 2015 shares | May. 31, 2015 trustee | Feb. 28, 2015 USD ($) shares | Apr. 30, 2014 USD ($) shares | Jan. 31, 2013 USD ($) shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) trustee $ / shares | Dec. 31, 2013 USD ($) $ / shares
Distributions |  |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 1.56 | $ 1.56 | $ 1.56
Distribution to common shareholders | $ |  |  |  |  |  |  |  | $ 356,390,000 | $ 305,767,000 | $ 288,945,000
Common shares issued in public offering |  |  |  |  | 31,050,000 | 15,525,000 | 11,500,000 |  |  |
Net proceeds after underwriting discounts from issuance of common shares issued in public offering | $ |  |  |  |  | $ 659,496,000 | $ 322,807,000 | $ 261,813,000 | $ 659,496,000 | $ 322,807,000 | $ 261,813,000
D - Common Stock Dividends, Ordinary Income Distribution Percentage |  |  |  |  |  |  |  | 51.48% | 54.00% | 66.19%
D - Common Stock Dividends, Return of Capital Distribution Percentage |  |  |  |  |  |  |  | 47.80% | 46.00% | 21.30%
D - Common Stock Dividends, Capital Gain Distribution Percentage |  |  |  |  |  |  |  | 0.00% | 0.00% | 3.10%
D - Common Stock Dividends, Unrecaptured Section 1250 Gain Distribution Percentage |  |  |  |  |  |  |  | 0.00% | 0.00% | 9.41%
Number of trustees | trustee |  |  |  | 5 |  |  |  |  | 5 |
RMR LLC |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |
Distribution to common shareholders (in dollars per share) | $ / shares | $ 0.0111 |  |  |  |  |  |  |  |  |
Distribution to common shareholders | $ | $ 2,635,379 |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition |  |  |  |  |  |  |  | 81,557 |  |
Certain Our Officers And Employees Of RMR LLC |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |
Shares purchased from certain of our officers and other employees of RMR LLC |  | 13,113 |  |  |  |  |  |  |  |
Closing share price of the entity's common shares (in dollars per share) | $ / shares |  | $ 16.19 |  |  |  |  |  |  |  |
RMR LLC |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition |  |  | 2,345,000 |  |  |  |  |  |  |

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