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Related Person Transactions (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 10, 2016 $ / shares shares | Nov. 30, 2017 community property | Mar. 31, 2017 building | Dec. 31, 2018 USD ($) community building property lease_agreement party agreement shares | Dec. 31, 2017 USD ($) community property | Dec. 31, 2016 USD ($) community property | Oct. 02, 2016 shares | Dec. 31, 2001
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of buildings included in joint venture agreement | building |  |  | 2 |  |  |  |  |
Equity in earnings of an investee |  |  |  | $ 516 | $ 608 | $ 137 |  |
Equity in unrealized (loss) gain of an investee |  |  |  | $ (68) | 462 | 152 |  |
The RMR Group Inc |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of unrelated parties | party |  |  |  | 4 |  |  |  |
Related party transaction, rate |  |  |  | 3.00% |  |  |  |
RMR Inc. | Common Shares |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Investment in common shares (in shares) | shares |  |  |  | 2,345,000 |  |  |  |
Period of shares not transferred |  |  |  | 10 years |  |  |  |
RMR Inc. | Class A common shares |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Investment in common shares (in shares) | shares |  |  |  | 2,637,408 |  |  |  |
RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Rental revenue from related party |  |  |  | $ 228 | $ 331 | $ 242 |  |
Senior Living Communities | Acquisitions |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  | 4 |  | 10 |  |
MOBs |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  | 13 |  | 2 |  |
Standalone insurance policy coverage period |  |  |  | 1 year |  |  |  |
Number of buildings included in joint venture agreement | building |  |  |  | 2 |  |  |  |
MOBs | Acquisitions |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  |  |  | 4 | 6 | 3 |  |
Purchase price excluding closing costs |  |  |  |  |  | $ 86,432 |  |
Five Star |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of total shares outstanding |  |  |  | 8.30% |  |  |  | 100.00%
Investment in common shares (in shares) | shares |  |  |  | 4,235,000 |  |  |  |
Maximum percentage of any class of equity shares that can be acquired without approval |  |  |  | 9.80% |  |  |  |
Number of real estate properties leased | community |  |  |  | 184 | 185 | 185 |  |
Property subject to or available for operating lease, number of leases | lease_agreement |  |  |  | 5 |  |  |  |
Related party transactions, shares authorized to purchase (in shares) | shares |  |  |  |  |  |  | 18,000,000 |
Related party transaction, percent of shares issued and outstanding |  |  |  |  |  |  | 38.00% |
Related party transaction, shares purchased (in shares) | shares | 17,999,999 |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 3.00 |  |  |  |  |  |  |
Five Star | RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of total shares outstanding |  |  |  | 35.40% |  |  |  |
Five Star | Senior Living Communities |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of communities managed | community |  |  |  | 76 | 70 | 68 |  |
Five Star | Senior Living Communities | Acquisitions |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of communities managed | community |  | 5 |  |  |  |  |  |
Number of properties acquired or agreed to be acquired | property |  | 6 |  |  |  |  |  |
RMR LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of management agreements with related party | agreement |  |  |  | 2 |  |  |  |
Premium payable for combined directors' and officers' liability insurance policy |  |  |  | $ 253 | $ 255 | $ 142 |  |
AIC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Total premiums including taxes and fees |  |  |  | 4,413 | 2,433 | 3,607 |  |
Equity method investments, carrying value |  |  |  | $ 8,632 | $ 8,185 | $ 7,116 |  |
Year one | RMR LLC | RMR Inc. |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 20.00% |  |  |  |
Year two | RMR LLC | RMR Inc. |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 20.00% |  |  |  |
Year three | RMR LLC | RMR Inc. |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 20.00% |  |  |  |
Year four | RMR LLC | RMR Inc. |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 20.00% |  |  |  |
Year five | RMR LLC | RMR Inc. |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 20.00% |  |  |  |
Five Star |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Minimum percentage of ownership of lessee's voting stock above which the entity has the option to cancel all its rights |  |  |  | 9.80% |  |  |  |

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