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Related Person Transactions (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 05, 2015 USD ($) agreement shares | Jan. 29, 2015 USD ($) ft² state property | Aug. 31, 2015 USD ($) property | Jul. 31, 2015 USD ($) property item | Jun. 30, 2015 USD ($) ft² property item shares | May. 31, 2015 USD ($) property agreement community item | Apr. 30, 2015 USD ($) | Feb. 28, 2015 USD ($) property shares | Jan. 31, 2015 USD ($) ft² property | Dec. 31, 2014 USD ($) community | Apr. 30, 2014 shares | Jun. 30, 2015 USD ($) ft² property Vote community item shares | Mar. 31, 2015 USD ($) | Jun. 30, 2014 USD ($) property community | Jun. 30, 2015 USD ($) ft² property community item shares | Jun. 30, 2014 USD ($) property shares | Dec. 31, 2014 USD ($) property | Dec. 31, 2001
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management and construction supervision fees paid |  |  |  |  |  |  |  |  |  |  |  | $ 1,494 |  | $ 1,497 | $ 3,235 | $ 2,915 |  |
Related party employee equity compensation plan accrual |  |  |  |  |  |  |  |  |  |  |  | $ 507 |  | 359 | $ 908 | 834 |  |
Issuance of shares (in shares) | shares |  |  |  |  |  |  |  | 31,050,000 |  |  | 15,525,000 |  |  |  |  |  |  |
Number of states in which properties are located | item |  |  |  |  | 43 |  |  |  |  |  |  | 43 |  |  | 43 |  |  |
Income (loss) recognized arising from equity investments |  |  |  |  |  |  |  |  |  |  |  | $ 23 |  | 118 | $ 95 | 21 |  |
Change in net unrealized gain(loss) on investments |  |  |  |  |  |  |  |  |  |  |  | $ 1,387 |  | 640 | $ 2,835 | (1,280) |  |
Number of properties agreed to be offered for sale | property |  |  |  |  | 3 |  |  |  |  |  |  | 3 |  |  | 3 |  |  |
Number of properties sold or agreed to be sold | property |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Interest and other income |  |  |  |  |  |  |  |  |  |  |  | $ 142 |  | 154 | $ 217 | 258 |  |
RMR Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management and construction supervision fees |  |  |  |  |  |  |  |  |  |  |  | 2,532 |  | 2,079 | 4,969 | 3,718 |  |
RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business management fees |  |  |  |  |  |  |  |  |  |  |  | $ 9,144 |  | $ 7,733 | $ 18,014 | $ 14,415 |  |
Base business management fee payable in cash (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |
Rental revenue from related party |  |  |  |  |  |  |  |  |  |  |  |  | $ 51 |  | $ 102 |  |  |
Senior living communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of living units | item |  |  |  |  | 192 |  |  |  |  |  |  | 192 |  |  | 192 |  |  |
Number Of Communities | community |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |
Number of properties agreed to be offered for sale | property |  |  | 3 |  | 3 |  |  |  |  |  |  | 3 |  |  | 3 |  |  |
Number of properties sold or agreed to be sold | property |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior living communities | Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of properties under agreement to be sold |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  |  |
Senior living communities | Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of properties under agreement to be sold |  |  | $ 850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of properties under agreement to be sold |  |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |
Number of properties agreed to be offered for sale | property |  |  |  |  | 1 |  |  |  |  |  |  | 1 |  | 4 | 1 | 4 |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total rental income recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,208 |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 |  |  |
Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of living units | item |  |  |  |  |  | 3,352 |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  | 37 |  |  |  |  |  |  |  |  |  |  | 2 |
Purchase price |  |  |  |  |  | $ 762,611 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  |  |  |  | $ 531,623 |  |  |  |  |  | $ 531,623 |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  |  |  |  |  |  | 23 |  |  |  |  |  | 23 |  | 2 |
Purchase price |  |  |  |  |  |  |  |  | $ 539,000 |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  |  |  |  | 2,170,000 |  |  |  | 2,170,000 |  |  | 2,170,000 |  |  | 2,170,000 |  |  |
Acquisition | MOBs | SIR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount from SIR related to working capital activity |  |  |  |  |  |  | $ 8,993 |  |  |  |  |  |  |  |  |  |  |
Agreement to acquire | Senior living communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of living units | item |  |  |  | 84 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Communities | community |  |  |  |  |  | 37 |  |  |  | 38 |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 18,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total shares outstanding |  |  |  |  | 8.60% |  |  |  |  |  |  | 8.60% |  |  | 8.60% |  |  | 100.00%
Investment in common shares | shares |  |  |  |  | 4,235,000 |  |  |  |  |  |  | 4,235,000 |  |  | 4,235,000 |  |  |
Five Star | Senior living communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased | property |  |  |  |  | 180 |  |  |  |  |  |  | 180 |  |  | 180 |  |  |
Total rental income recognized |  |  |  |  |  |  |  |  |  |  |  | $ 47,753 |  | $ 47,618 | $ 95,443 | $ 95,124 |  |
Deferred estimated percentage rent payments received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,824 | 2,819 |  |
Real estate improvements purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,392 | 17,423 |  |
Rents receivable |  |  |  |  | $ 15,918 |  |  |  |  | $ 17,310 |  | $ 15,918 |  |  | 15,918 |  | $ 17,310 |
Increase or decrease in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 757 | 1,394 |  |
Number of properties acquired, referred to as managed properties |  |  |  |  |  | 37 |  |  |  |  |  | 60 |  | 44 | 60 |  |  |
Property management agreement expense |  |  |  |  |  |  |  |  |  |  |  | $ 2,699 |  | $ 2,433 | $ 5,222 | 4,857 |  |
Number of separate management agreements entered for communities acquired | agreement |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Senior living communities | TRS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  |  |  |  |  | $ 9,750 |  |  |  |  |  |  |  |  |  |  |  |
Number of private pay independent living units | item |  |  |  |  |  | 40 |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Acquisition | Senior living communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of living units | item |  |  |  |  |  | 838 |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Sale | Senior living communities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price of properties under agreement to be sold |  |  | 850 | 155 |  |  |  | 250 |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  | $ (16) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Five Star | Sale | Senior living communities | Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum annual rent payable to entity |  |  |  |  |  |  |  | $ 23 |  |  |  |  |  |  |  |  |  |
Five Star | Sale | Senior living communities | Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum annual rent payable to entity |  |  | $ 85 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
D&R Yonkers LLC | TRS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sublease rental |  |  |  |  |  |  |  |  |  |  |  | 752 |  | 730 | $ 1,504 | 1,460 |  |
RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81,557 |  |  |
SIR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt disposed of from properties sold |  | $ 29,955 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SIR | Acquisition | MOBs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price excluding closing costs and working capital adjustments |  | $ 539,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties (in square feet) | ft² |  | 2,170,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states in which properties are located | state |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments, carrying value |  |  |  |  | 6,903 |  |  |  |  |  |  | 6,903 |  |  | $ 6,903 |  |  |
Income (loss) recognized arising from equity investments |  |  |  |  |  |  |  |  |  |  |  | 23 |  | 118 | 95 | 21 |  |
Change in net unrealized gain(loss) on investments |  |  |  |  |  |  |  |  |  |  |  | $ (64) |  | $ 22 | $ (19) | $ 41 |  |
Coverage of purchased property insurance |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Coverage of purchased property insurance for large property |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Coverage of purchased property terror insurance |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Property insurance premium |  |  |  |  | $ 4,222 |  |  |  |  |  |  |  |  |  |  |  |  |
Up C Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect economic interest in RMR LLC (as a percent) | 17.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up C Transaction | RMR Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct and indirect economic interest in RMR LLC (as a percent) | 51.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting power of outstanding capital stock of RMR Inc. (as a percent) | 91.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up C Transaction | RMR LLC | Amended Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business days notice for termination of property management agreement for convenience by the related party | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business days notice for termination of property management agreement for performance by the related party | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Window for providing notice of termination of property management agreement for performance by the related party | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Window for providing notice of termination of property management agreement for change of control by the related party | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of terminated management agreements for convenience before termination fee is incurred | agreement | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of RMR LLC terminated management agreements for good cause before termination fee is incurred | agreement | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of terminated management agreements for a performance reason before termination fee is incurred | agreement | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination fee remaining term assumption | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up C Transaction | GOV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect economic interest in RMR LLC (as a percent) | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up C Transaction | HPT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect economic interest in RMR LLC (as a percent) | 16.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up C Transaction | SIR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect economic interest in RMR LLC (as a percent) | 10.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up C Transaction | Managing Trustees Barry And Adam Portnoy | RMR Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares under lock up and registration agreement | shares |  |  |  |  |  |  |  |  |  |  |  | 2,345,000 |  |  |  |  |  |
Period over which shares remain under lock up and registration agreement |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
RMR Inc | Up C Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | $ 13,967 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity conversion ratio of RMR Inc class B-1 common stock |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Equity conversion ratio of RMR LLC class A membership units |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Preliminary amount of investment acquired | 60,739 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of investment acquired | $ 58,428 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment | $ 136,278 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial other liabilities | 77,850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment at carrying value, including transaction costs | $ 138,839 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares acquired | shares | 5,272,787 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RMR Inc | Up C Transaction | RMR Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | $ 11,520 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RMR Inc | Up C Transaction | RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Straight line discount amortization period | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RMR Inc | Up C Transaction | RMR LLC | General and administrative expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of other liabilities to reduce business and property management fees |  |  |  |  |  |  |  |  |  |  |  | $ 191 |  |  |  |  |  |
RMR Inc | Up C Transaction | RMR LLC | Operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of other liabilities to reduce business and property management fees |  |  |  |  |  |  |  |  |  |  |  | $ 51 |  |  |  |  |  |
RMR Inc | Up C Transaction | GOV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | $ 3,917 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RMR Inc | Up C Transaction | HPT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | 12,622 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RMR Inc | Up C Transaction | SIR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price | $ 15,880 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares | RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued as payment for base business management fee | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,983 | 62,060 |  |
Common Shares | RMR Inc | Up C Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 2,345,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period prior to acquisition over which weighted average trading prices are calculated | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares | RMR Inc | Up C Transaction | GOV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares | RMR Inc | Up C Transaction | HPT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 1,490,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares | RMR Inc | Up C Transaction | SIR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 880,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A common shares | Up C Transaction | RMR Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 5,272,787 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A common shares | Up C Transaction | GOV | RMR Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 1,541,201 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A common shares | Up C Transaction | HPT | RMR Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 5,019,121 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A common shares | Up C Transaction | SIR | RMR Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 3,166,891 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A common shares | RMR Inc | Up C Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per equity interest | Vote |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Class B1 common shares | Up C Transaction | RMR Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B1 common shares | RMR Inc | RMR Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in common shares | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B1 common shares | RMR Inc | Up C Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per equity interest | Vote |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Class B2 common shares | Up C Transaction | RMR Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B2 common shares | RMR Inc | RMR Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in common shares | shares | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B2 common shares | RMR Inc | Up C Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes per equity interest | Vote |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Class A member units | RMR LLC | RMR Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in common shares | shares | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A member units | RMR Inc | Up C Transaction | RMR LLC | RMR Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in common shares | shares | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition related party equity interests delivered | shares | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class B member units | RMR Inc | Up C Transaction | RMR LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with acquisition | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represent the amounts due from related person, owed to us from SIR related to working capital activity for MOBs. + References No definition available. + Details
Name: | snh_AmountOwedFromSir
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of shares delivered of equity interests owned of a related party to acquire an entity. + References No definition available. + Details
Name: | snh_BusinessAcquisitionEquityInterestsDelivered
Namespace Prefix: | snh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Amortization of the difference between the carrying amount of the cost method investment and its fair value for the period. + References No definition available. + Details
Name: | snh_CostMethodInvestmentAmortizationOfDifferenceBetweenCarryingAmountAndUnderlying
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Preliminary original amount of cost-method investments at the acquisition date. + References No definition available. + Details
Name: | snh_CostMethodInvestmentsPreliminaryOriginalCost
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The precentage of interest acquired by acquiring common stock accounted under the cost method of accounting. + References No definition available. + Details
Name: | snh_CostMethodOfInvestementPercentageOfInterestAcquired
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number shares acquired which have been accounted under cost method of accounting. + References No definition available. + Details
Name: | snh_CostMethodOfInvestmentSharesAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the deferred estimated percentage rent payments received during the period. + References No definition available. + Details
Name: | snh_DeferredEstimatedPercentageRentReceived
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of direct and indirect economic interest held in RMR LLC. + References No definition available. + Details
Name: | snh_DirectAndIndirectEconomicInterestPercent
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount accrued for related party employee equity compensation award share grants. + References No definition available. + Details
Name: | snh_EmployeeEquityCompensationPlanAccrual
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The ratio upon conversion of RMR Inc. class B-1 common stock into RMR Inc. class A common stock. + References No definition available. + Details
Name: | snh_EquityInstrumentConvertibleConversionRatio
Namespace Prefix: | snh_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition The ratio upon conversion of RMR LLC class A membership units owned by RMR Trust into RMR Inc. class A common stock. + References No definition available. + Details
Name: | snh_EquityInstrumentConvertibleConversionRatio1
Namespace Prefix: | snh_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the increase or decrease on the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | snh_IncreaseDecreaseOperatingLeasesAnnualRent
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the percentage of indirect economic interest held in RMR LLC. + References No definition available. + Details
Name: | snh_IndirectEconomicInterestPercent
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The initial other liabilities recorded which is the difference of the total consideration paid and the fair market value of the investment. + References No definition available. + Details
Name: | snh_InitialOtherLiabilities
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the carrying value of a cost method investment including transaction costs. + References No definition available. + Details
Name: | snh_InvestmentAtCarryingValueIncludingTransactionCosts
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the number of shares held as a percentage of the total shares outstanding at the end of the period. + References No definition available. + Details
Name: | snh_InvestmentOwnedPercentageOfTotalSharesOutstanding
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of the company's common shares under a lock up and registration rights agreement that are not authorized to be transfered for a specified period of time. + References No definition available. + Details
Name: | snh_LockUpAgreementTransferOfCommonShares
Namespace Prefix: | snh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period over which the company's common shares remain under a lock up and registration rights agreement and not authorized to be transfered. + References No definition available. + Details
Name: | snh_LockUpAgreementTransferOfCommonSharesPeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of private pay independent living units within communities acquired. + References No definition available. + Details
Name: | snh_NumberOfAcquiredPrivatePayIndependentLivingUnits
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of communities. + References No definition available. + Details
Name: | snh_NumberOfCommunities
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of management agreements the company would need to terminate for convenience before a termination fee is incurred. + References No definition available. + Details
Name: | snh_NumberOfManagementAgreemtentsTerminatedBeforeTerminationFeeIncurred
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition presents the number of management agreements RMR LLC would need to terminate for good cause before a termination fee is incurred. + References No definition available. + Details
Name: | snh_NumberOfManagementAgreemtentsTerminatedGoodCauseBeforeTerminationFeeIncurred
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of management agreements the company would need to terminate for a performance reason before a termination fee is incurred. + References No definition available. + Details
Name: | snh_NumberOfManagementAgreemtentsTerminatedPerformanceBeforeTerminationFeeIncurred
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the number of properties acquired or agreed to be acquired by the entity during the period. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAcquired
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of properties acquired or agreed to be acquired by the entity during the period, which are referred by the entity as managed properties. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAcquiredManagedProperties
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the number of properties sold or agreed to be sold by the entity. + References No definition available. + Details
Name: | snh_NumberOfPropertiesSold
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the number of separate management agreements entered for communities acquired, upon termination of a pre-existing combined management agreement. + References No definition available. + Details
Name: | snh_NumberOfSeparateManagementAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of votes per equity interest. + References No definition available. + Details
Name: | snh_NumberOfVotesPerEquityInterest
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the annual rent the lessee is obligated to pay on an operating lease. + References No definition available. + Details
Name: | snh_OperatingLeasesAnnualRent
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the aggregate purchase price excluding closing costs, of real estate properties acquired by the entity during the period. + References No definition available. + Details
Name: | snh_RealEstateAggregatePurchasePrice
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the aggregate purchase price of real estate properties acquired by the entity during the period. This amount includes cash paid plus debt assumed, if any, and other settlement adjustments but excludes closing costs. + References No definition available. + Details
Name: | snh_RealEstateAggregatePurchasePriceIncludingOtherSettlementAdjustments
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity during the period. + References No definition available. + Details
Name: | snh_RealEstateAggregateSalesPrice
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the debt disposed of in sale of property transactions. + References No definition available. + Details
Name: | snh_RealEstateDebtDisposedOfInSaleOfPropertyTransactions
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of improvements to real estate properties made by lessees and purchased by the entity. + References No definition available. + Details
Name: | snh_RealEstateImprovementsByLesseePurchased
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the cash purchase price paid to acquire common shares of beneficial interest of related party pursuant to the stock purchase agreement. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionCashPurchasePrice
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionExpensesFromPropertyManagementAgreementTransactionsWithRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the window or numbers of business days after any calendar year to provide notice for termination of property management agreement by the related party for performance reasons. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionNumberOfBusinessDayWindowAfterEndOfAnyCalendarYearPriorWrittenNoticeForTerminationOfPropertyManagementAgreementForPerformanceByRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of business days notice for termination of property management agreement by the related party for convenience. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionNumberOfBusinessDaysPriorWrittenNoticeForTerminationOfPropertyManagementAgreementForConvenienceByRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of business days notice for termination of property management agreement by the related party for performance, provided within a given window or numbers of days after any calendar year. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionNumberOfBusinessDaysPriorWrittenNoticeForTerminationOfPropertyManagementAgreementForPerformanceByRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of base business management fees payable in cash. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPercentageOfBaseBusinessManagementFeePayableInCash
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the insurance coverage of the property insurance purchased from related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyInsuranceCoverageAmount
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the insurance coverage of the property insurance on a large property purchased from related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyInsuranceCoverageLargePropertyAmount
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFees
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the property management and construction supervision fees paid to related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAndConstructionSupervisionFeesPaid
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents insurance coverage for terrorism of the property insurance purchased from related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyTerrorInsuranceCoverageAmount
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the window after a change in control to provide notice for termination of property management agreement by the related party. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionWindowAfterChangeOfControlPriorWrittenNoticeForTerminationOfPropertyManagementAgreementByRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents rents receivable at the balance sheet date. + References No definition available. + Details
Name: | snh_RentsReceivable
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the period over which the discount on shares acquired is amortized in years. + References No definition available. + Details
Name: | snh_StaightLineDiscountAmortizationPeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition epresents the remaining term assumption in years used to calculate the fee for termination of one or both of the company's amended management agreements for a performance reason. + References No definition available. + Details
Name: | snh_TerminationFeeRemainingTermAssumption
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of voting power controlled by a given entity with outstanding capital stock in RMR Inc. + References No definition available. + Details
Name: | snh_VotingPowerPercent
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period prior to acquisition over which weighted average trading prices are calculated. + References No definition available. + Details
Name: | snh_WeightedAverageTradingPricePeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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