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Related Person Transactions (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2012
Jun. 30, 2012
item
Jun. 30, 2011
Jun. 30, 2012
item
Jun. 30, 2011
Jun. 30, 2012
Senior living communities
item
May 31, 2011
Acquisition
Senior living communities
item
Jun. 30, 2012
Operations Transfer Agreement
TRS
item
Jun. 30, 2012
Five Star
item
Jun. 30, 2011
Five Star
Jun. 30, 2012
Five Star
item
Jun. 30, 2011
Five Star
Apr. 30, 2012
Five Star
Dec. 31, 2011
Five Star
May 31, 2011
Five Star
Jul. 31, 2012
Five Star
Senior living communities
South Carolina
item
May 31, 2012
Five Star
Senior living communities
South Carolina
item
Jun. 30, 2012
Five Star
Acquisition
Jun. 30, 2012
Five Star
Acquisition
Jun. 30, 2012
Five Star
Acquisition
Senior living communities
item
May 31, 2012
Five Star
Acquisition
Senior living communities
South Carolina
Jun. 30, 2012
Five Star
Acquisition
Rehabilitation hospitals
item
May 31, 2012
Five Star
Operations Transfer Agreement
TRS
item
Jun. 30, 2012
Five Star
Operations Transfer Agreement
TRS
item
Mar. 31, 2012
RMR
Jun. 30, 2012
RMR
item
Jun. 30, 2011
RMR
Jun. 30, 2012
RMR
item
Jun. 30, 2011
RMR
Jun. 30, 2012
AIC
item
Jun. 30, 2012
AIC
item
Jun. 30, 2011
AIC
Jun. 30, 2012
AIC
item
Jun. 30, 2011
AIC
Dec. 31, 2011
AIC
Jun. 30, 2012
CommonWealth REIT (CWH)
item
Sep. 30, 2011
CommonWealth REIT (CWH)
Acquisition
MOBs
item
sqft
Mar. 31, 2012
CommonWealth REIT (CWH)
Acquisition
MOBs
Mar. 31, 2010
CommonWealth REIT (CWH)
Acquisition
MOBs
item
Nov. 30, 2010
CommonWealth REIT (CWH)
Acquisition
MOBs
sqft
Jun. 30, 2012
Sunrise Senior Living, Inc.
item
Jun. 30, 2012
Sunrise Senior Living, Inc.
Senior living communities
item
Jun. 30, 2012
Sunrise Senior Living, Inc.
Operations Transfer Agreement
item
Related person transactions                                                                                      
Number of agreements to avail management and administrative services                                                   2   2                              
Number of Managing Trustees also serving as managing trustee of CWH                 1   1                                                 1              
Number of Managing Trustees also serving as President of CWH                                                                       1              
Business management agreement expense                                                   $ 6,367 $ 5,572 $ 12,727 $ 10,390                            
Common shares issued to RMR 13,800,000                                               20,462                                    
Property management agreement expense                 1,080 25 2,148 25                           1,424 1,057 2,770 2,081                            
Beneficial ownership of common shares (as a percent)                 100.00%   100.00%                                                                
Number of properties acquired, referred as managed properties                     24         232 59                                                    
Number of real estate properties leased           24   10                       188   2                                     10 14  
Number of properties under accelerated lease termintion                                                                                     10
Number of communities under accelerated lease termintion                                             10                                       10
Number of communities under management operations                                             10 10                                      
Minimum annual rent payable to entity                     196,371                                                                
Total rent recognized                 48,942 46,789 97,753 93,488                                                              
Rents receivable                 17,518   17,518     17,313                                                          
Real estate improvements purchased                     14,093             7,775 14,093                                                
Increase or decrease in annual lease rent payable                     1,137             625 1,137                                                
Interest and other income   227 244 709 476       39 58 314 58                                                              
Amount agreed to be lend under Bridge Loan Agreement                             80,000                                                        
Aggregate principal amount outstanding under Bridge Loan                         38,000                                                            
Number of states in which properties are located   39   39     6                                                           8            
Investment in common shares                 4,235,000   4,235,000                                                 250,000              
Number of Independent Trustees also serving as independent trustee of CWH                                                                       1              
Percentage of total shares outstanding                 8.80%   8.80%                                                                
Area of real estate properties acquired (in square feet)                                                                         1,310,000     2,803,000      
Aggregate purchase price of properties acquired, excluding closing costs                               37,273         8,059                               167,000 470,000          
Equity method investments, ownership percentage                                                           12.50% 12.50%   12.50%                    
The entity owns less than this percentage of an equity method investment                                                           20.00% 20.00%   20.00%                    
Equity method investments, carrying value                                                           5,408 5,408   5,408   5,291                
Earnings and losses recognized related to equity investments   76 46 121 83                                                   76 46 121 83                  
Coverage of property insurance                                                                 500,000                    
Number of properties agreed to be acquired, referred as leased properties                                                                         13   27        
Number of other companies which are shareholders of equity method investee                                                           4 4   4                    
Period for which property insurance program was extended                                                           1 year                          
Total premiums including taxes and fees                                                                 $ 4,438