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Related Person Transactions - Investment in RMR Inc (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 21, 2016 $ / shares | Sep. 30, 2016 USD ($) company | Sep. 30, 2016 USD ($) company $ / shares | Jun. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) company shares | Sep. 30, 2015 USD ($) | Oct. 27, 2016 shares | Oct. 02, 2016 $ / shares shares | Dec. 31, 2015 USD ($)
Related person transactions |  |  |  |  |  |  |  |  |  |
Income (loss) recognized arising from equity investments |  |  | $ 13,000 |  | $ (24,000) | $ 107,000 | $ 70,000 |  |  |
Change in net unrealized gain(loss) on investments |  |  | 16,562,000 |  | (7,242,000) | $ 56,680,000 | (4,407,000) |  |  |
Officers' compensation, directors' and officers' liability insurance policy extension period |  | 1 year |  |  |  |  |  |  |  |
Officers' compensation, directors' and officers' liability insurance policy premium |  | $ 142,000 |  |  |  |  |  |  |  |
RMR Inc |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Amortization of other liabilities to reduce business and property management fees |  |  | $ 943,000 |  | 959,000 |  |  |  |  |
RMR Inc | Class A common shares |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Number of shares purchased (in shares) | shares |  |  |  |  |  | 2,637,408 |  |  |  |
Common stock dividend declared (in dollars per share) | $ / shares |  |  | $ 0.25 |  |  |  |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Payment of capital expenditure |  |  | $ 266,000 |  |  | $ 266,000 |  |  |  |
AIC |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Equity method investments, carrying value |  | 7,110,000 | 7,110,000 |  |  | 7,110,000 |  |  |  | $ 6,827,000
Income (loss) recognized arising from equity investments |  |  | 13,000 |  | (24,000) | 107,000 | 70,000 |  |  |
Change in net unrealized gain(loss) on investments |  |  | 80,000 |  | (72,000) | 175,000 | (91,000) |  |  |
Property insurance premium |  |  |  |  |  | 3,607,000 |  |  |  |
RMR LLC |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Rental revenue from related party |  |  | 82,000 |  | $ 51,000 | 198,000 | 153,000 |  |  |
RMR Inc | RMR Inc |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Amortization of other liabilities to reduce business and property management fees |  |  |  |  |  | 2,829,000 | $ 1,202,000 |  |  |
RMR Inc | RMR LLC |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Initial other liabilities |  | $ 72,876,000 | $ 72,876,000 |  |  | 72,876,000 |  |  |  |
December 14, 2015 through March 31, 2016 | RMR Inc | Class A common shares |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  | $ 789,000 |  |  |  |  |  |
April 1, 2016 through June 30, 2016 | RMR Inc | Class A common shares |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  | $ 659,000 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Common stock dividend declared (in dollars per share) | $ / shares | $ 0.39 |  |  |  |  |  |  |  |  |
Subsequent Event | ABP Trust |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Consent agreement, maximum number of shares (in shares) | shares |  |  |  |  |  |  |  | 18,000,000 | 10,000,000 |
Consent agreement, share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 3.00 |
AIC |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |
Number of affiliates | company |  | 7 | 7 |  |  | 7 |  |  |  |

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