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Related Person Transactions (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 12 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 12 Months Ended
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Jan. 31, 2013 | Jul. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Dec. 31, 2012 sqft | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Maximum | Aug. 31, 2012 Mortgages Property item | Dec. 31, 2012 Mortgages Property | Dec. 31, 2012 IL Pooling Agreement item | Dec. 31, 2012 MOBs | Dec. 31, 2011 MOBs | Aug. 31, 2012 Acquisition Senior living communities New York item | Dec. 31, 2012 Acquisition Senior living communities Tennessee item | Dec. 31, 2012 Acquisition Senior living communities Texas item | Dec. 31, 2012 Acquisition MOBs item sqft | Dec. 31, 2011 Acquisition MOBs item sqft | Dec. 31, 2012 Operations Transfer Agreement TRS item | Mar. 31, 2013 RMR | Mar. 31, 2012 RMR | Mar. 31, 2011 RMR | Dec. 31, 2012 RMR item | Dec. 31, 2011 RMR | Dec. 31, 2010 RMR | Dec. 31, 2012 RMR MOBs | Dec. 31, 2012 RMR Restricted shares | Dec. 31, 2011 RMR Restricted shares | Dec. 31, 2010 RMR Restricted shares | Dec. 31, 2012 RMR Regional Offices item sqft | Aug. 31, 2012 Five Star item | Apr. 30, 2010 Five Star | Jun. 30, 2011 Five Star | Dec. 31, 2012 Five Star item | Dec. 31, 2011 Five Star | Dec. 31, 2010 Five Star | May 31, 2011 Five Star | Dec. 31, 2012 Five Star AL Pooling Agreement item | May 31, 2012 Five Star Senior living communities Property | Dec. 31, 2012 Five Star Senior living communities item | Aug. 31, 2012 Five Star Senior living communities | Feb. 29, 2012 Five Star Senior living communities Alabama | Dec. 31, 2012 Five Star Rehabilitation hospitals item | Dec. 31, 2012 Five Star Acquisition | Dec. 31, 2011 Five Star Acquisition | Jul. 31, 2012 Five Star Acquisition Senior living communities | May 31, 2012 Five Star Acquisition Senior living communities | Jul. 31, 2012 Five Star Acquisition Senior living communities South Carolina item | May 31, 2012 Five Star Acquisition Senior living communities South Carolina item | Aug. 31, 2012 Five Star Acquisition Senior living communities Missouri item | Aug. 31, 2012 Five Star Acquisition Senior living communities New York item | Feb. 29, 2012 Five Star Acquisition Senior living communities Alabama item | May 31, 2012 Five Star Operations Transfer Agreement TRS item | Dec. 31, 2012 CommonWealth REIT (CWH) item | Sep. 30, 2011 CommonWealth REIT (CWH) Acquisition MOBs item sqft | Mar. 31, 2011 CommonWealth REIT (CWH) Acquisition MOBs item | Jan. 31, 2011 CommonWealth REIT (CWH) Acquisition MOBs sqft | Jun. 30, 2012 AIC | Dec. 31, 2012 AIC | Dec. 31, 2011 AIC | Dec. 31, 2010 AIC | Dec. 31, 2012 Sunrise Senior Living, Inc. Operations Transfer Agreement item
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements to avail management and administrative services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 820 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Managing Trustees also serving as managing trustee of CWH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Annual rate of compensation payable under business management agreement as a percentage of book value of the assets owned by the entity or its subsidiaries as of October 12, 1999 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rate of compensation payable under business management agreement as a percentage of historical cost of other real estate investments up to the first $250,000 (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Historical cost of other real estate investments used to determine the compensation payable to related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual rate of compensation payable under business management agreement as a percentage of historical cost of other real estate investments over $250,000 (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee (in dollars per share) |  |  |  |  |  |  |  | $ 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business management agreement expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,372 | 20,814 | 17,166 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued to RMR | 11,500,000 | 13,800,000 | 9,200,000 | 11,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,968 | 20,462 | 8,939 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees payable under property management agreement as a percentage of gross rents (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction supervision fees payable under property management agreement as a percentage of construction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property management agreement expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,791 | 4,455 | 2,353 |  |  |  |  |  |  |  |  | 5,582 | 835 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro rata share of internal audit costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 193 | 240 | 211 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period by which business management agreement and property management agreement get automatically renewed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period before which the written notice is required to be given for cancellation of business management agreement and the property management agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business days before which the notice is required to be given for termination of property management agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate properties leased (in square feet) |  |  |  |  | 636,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties agreed to be acquired, or agreed to be acquired, referred as leased properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental revenue from related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 186 | 180 | 169 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Awards granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,492 | 72,450 | 66,850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of awards granted during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,775 | 1,732 | 1,625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of the awards granted that vested on grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of the awards granted which will vest on each of the next four anniversaries of the grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership of common shares (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,235,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |
Investment in common shares purchased from underwriters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of investment in common shares purchased from underwriters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of ownership of lessee's voting stock above which the entity has the option to cancel all its rights, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 188 |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive period during which the entity must not receive the minimum return for the property management agreement to be subject to the pooling agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum annual rent payable to entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 197,688 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total rental income recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,912 | 195,409 | 189,682 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rents receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,680 | 17,313 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate improvements purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,520 | 33,269 | 31,894 |  |  |  |  |  |  |  | 30,520 | 33,269 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,456 | 2,665 | 2,555 |  |  |  |  |  |  |  | 2,456 | 2,665 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees as a percentage of gross revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual return as a percentage of invested surplus specified as a base for determining incentive fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee as percentage of the annual net operating income after the entity realizes an annual return equal to 8% of invested capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive renewal terms of agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of any class of equity shares that can be acquired without approval |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pooling agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of communities that include assisted living units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties acquired, referred to as managed properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39 |  |  |  |  |  | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of living units |  |  |  |  |  |  |  |  |  |  |  |  |  | 310 | 90 | 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 232 | 59 | 87 | 310 | 92 |  |  |  |  |  |  |  |  |  |
Aggregate purchase price of properties acquired, excluding closing costs |  |  |  |  |  |  |  |  |  |  |  | 449,657 | 991,618 |  | 11,550 | 9,000 | 225,695 | 336,395 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,300 |  |  |  | 37,273 | 8,059 |  |  | 11,280 | 99,000 |  |  |  | 167,000 | 470,000 |  |  |  |  |  |
Number of properties under accelerated lease termination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10
Number of communities under management operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Amount agreed to be lent under Bridge Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest and other income |  |  |  |  | 1,117 | 1,451 | 844 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 314 | 593 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayment of debt variable portion |  |  |  |  |  |  |  |  | 199,197 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties released from mortgage as collateral |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties mortgaged |  |  |  |  |  |  |  |  | 28 | 56 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Independent Trustees also serving as independent trustee of CWH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Proceeds from repayment of bridge loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of common stock required by transaction agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Area of real estate properties acquired (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 839,194 | 2,480,159 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,310,000 |  | 2,803,000 |  |  |  |  |
Ownership percentage held by us, RMR, Five Star, CWH and four other companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% |  |  |
The entity owns less than this percentage of an equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 | 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties agreed to be acquired, referred as leased properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 | 27 |  |  |  |  |  |
Amount invested in equity investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,209 |  |  |
Equity method investments, carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,629 | 5,291 |  |
Earnings and losses recognized related to equity investments |  |  |  |  | 316 | 139 | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 316 | 139 | (1) |
Period for which property insurance program was extended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Coverage of property insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
Total premiums including taxes and fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,438 |  | $ 1,600 | $ 275 |
Number of communities that include independent living units |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the cash outflow for the early repayment of borrowing variable portion of debt. + References No definition available. + Details
Name: | snh_EarlyRepaymentOfSeniorSecuredDebtVariablePortion
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The entity owns less than this percentage of an equity method investment. + References No definition available. + Details
Name: | snh_EquityMethodInvestmentOwnershipPercentageHeld
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the amount of annual premiums including taxes and fees for property insurance pursuant to an insurance program arranged by the equity method investee. + References No definition available. + Details
Name: | snh_EquityMethodInvestmentPropertyInsuranceAnnualPremiumAmount
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of coverage provided for property insurance pursuant to an insurance program arranged by the equity method investee. + References No definition available. + Details
Name: | snh_EquityMethodInvestmentPropertyInsuranceCoverageAmount
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- 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 investment in common shares purchased from underwriters. + References No definition available. + Details
Name: | snh_InvestmentOwnedPurchasedFromUnderwritersShares
Namespace Prefix: | snh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of common stock held in the investee. + References No definition available. + Details
Name: | snh_InvestmentOwnershipPercentage
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the minimum percentage of common stock held in the investee above which the entity would have the option to cancel all its rights. + References No definition available. + Details
Name: | snh_MinimumInvestmentOwnershipPercentageEligibleForOptionToCancelRightsOfLessee
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of business days before which the notice is required to be given for termination of property management agreement. + References No definition available. + Details
Name: | snh_NumberOfBusinessDaysBeforeWhichNoticeRequiredForTerminationOfPropertyManagementAgreementUponChangeInControl
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the information pertaining to number of communities that include assisted living units. + References No definition available. + Details
Name: | snh_NumberOfCommunitiesThatIncludeAssistedLivingUnits
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the information pertaining to number of communities that include independent living units. + References No definition available. + Details
Name: | snh_NumberOfCommunitiesThatIncludeIndependentLivingUnits
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of communities under management operations under the long term management agreements. + References No definition available. + Details
Name: | snh_NumberOfCommunitiesUnderLongTermManagementAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of independent trustees of the entity also serving as independent trustees in the another related party of the entity. + References No definition available. + Details
Name: | snh_NumberOfIndependentTrusteesAlsoServingAsIndependentTrusteesOfRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Managing Trustees of the entity also serving as managing trustee of a related party. + References No definition available. + Details
Name: | snh_NumberOfManagingTrusteesAlsoServingAsManagingTrusteeOfRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of pooling agreement. + References No definition available. + Details
Name: | snh_NumberOfPoolingAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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

X
- 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

X
- Definition Represents the number of properties agreed to be acquired by the entity under purchase agreements, which are referred by the entity as leased properties. + References No definition available. + Details
Name: | snh_NumberOfPropertiesAgreedToBeAcquiredLeasedProperties
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of properties under the accelerated lease termination. + References No definition available. + Details
Name: | snh_NumberOfPropertiesUnderAcceleratedLeaseTermination
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of real estate properties serving as collateral for debt as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfRealEstatePropertiesCollateralized
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties released from mortgage as collateral for debt as of the balance sheet date. + References No definition available. + Details
Name: | snh_NumberOfRealEstatePropertiesReleasedFromMortgageCollateral
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the service agreements entered into by the entity for availing services from other entities. + References No definition available. + Details
Name: | snh_NumberOfServiceAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Definition Represents the period before which the written notice is required to be given for cancellation of service agreements. + References No definition available. + Details
Name: | snh_PeriodBeforeWhichWrittenNoticeRequiredForTerminationOfServiceAgreements
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period by which the term of service agreements (i.e. business management and property management agreement) gets automatically renewed unless a notice for non-renewal is given. + References No definition available. + Details
Name: | snh_PeriodByWhichTermOfServiceAgreementsIsAutomaticallyRenewed
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for which the term of property insurance program is extended. + References No definition available. + Details
Name: | snh_PeriodForWhichPropertyInsuranceProgramExtended
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- 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 number of persons employed by a related party of the entity. + References No definition available. + Details
Name: | snh_RelatedPartyEmployeesNumber
Namespace Prefix: | snh_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the compensation payable to related parties under business management agreement expressed as a percentage in excess of the historical cost of other real estate investments. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageInExcessOfHistoricalCostOfOtherRealEstateInvestments
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the compensation payable to related parties under business management agreement expressed as a percentage of the average book value of the assets owned. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageOfAverageBookValueOfAssets
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the compensation payable to related parties under business management agreement expressed as a percentage of historical cost of other real estate investments. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageOfAverageHistoricalCostOfOtherRealEstateInvestments
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the average historical cost of other real estate investments used to determine the compensation payable to related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementAgreementCompensationAverageHistoricalCostOfOtherRealEstateInvestments
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the incentive fee payable to related parties under business management agreement expressed as a percentage of the product of (i) the weighted average of our common shares outstanding on a diluted basis during a fiscal year and (ii) the excess if any of the FFO Per Share, as defined in the business management agreement, for such fiscal year over the FFO Per Share of the preceding fiscal year. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementAgreementIncentiveFeePercentage
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the multiple of the weighted average number of common shares used to determine the maximum number of common shares to be issued in lieu of incentive fees to related party. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionBusinessManagementAgreementMaximumNumberOfCommonSharesToBeIssuedForIncentiveFeeWeightedAverageNumberOfCommonSharesOutstandingMultiplier
Namespace Prefix: | snh_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expenses recognized during the period resulting from business 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_RelatedPartyTransactionExpensesFromBusinessManagementAgreementTransactionsWithRelatedParty
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 annual return as a percentage of the entity's invested surplus used to determine the incentive fee payable to related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementAnnualReturnAsPercentageOfInvestedCapital
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the construction supervision fees payable to related parties under property management agreement expressed as a percentage of construction costs. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementConstructionSupervisionFeesAsPercentageOfConstructionCosts
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the incentive fee payable to related parties under property management agreement expressed as a percentage of the annual net operating income after the entity realizes an annual return equal to specified percentage of its invested capital. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementIncentiveFeeAsPercentageOfAnnualNetOperatingIncomeAfterRealizationOfSpecifiedPercentageOfAnnualReturn
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the management fees payable to related parties under property management agreement expressed as a percentage of gross rents. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementManagementFeesAsPercentageOfGrossRents
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the management fees payable to related parties under property management agreement expressed as a percentage of gross revenues. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementManagementFeesAsPercentageOfGrossRevenues
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of consecutive renewal terms of agreement that the entity has the option to renew. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms
Namespace Prefix: | snh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of years for which the entity has the option to renew the agreement. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementRenewalPeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of consecutive period during which the entity must not receive the minimum return for the property management agreement to be subject to the pooling agreement. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionPropertyManagementAgreementSubjectToPoolingAgreementMinimumReturnNotReceivedPeriod
Namespace Prefix: | snh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the pro rata share of the internal audit costs borne by the entity pursuant to arrangements with related parties. + References No definition available. + Details
Name: | snh_RelatedPartyTransactionProRataShareOfInternalAuditCosts
Namespace Prefix: | snh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 portion of awards granted which will vest on the grant date. + References No definition available. + Details
Name: | snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentVestedOnGrantDate
Namespace Prefix: | snh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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