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Related Person Transactions (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 2 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 2 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
sqft
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2011
Acquisition
MOB
Property
Dec. 31, 2011
Acquisition
MOB
Property
Dec. 31, 2010
Acquisition
MOB
Property
Feb. 29, 2012
Agreement to acquire
sqft
Oct. 31, 2011
RMR
Dec. 31, 2011
RMR
agreement
Y
employee
D
Dec. 31, 2010
RMR
Dec. 31, 2009
RMR
Oct. 26, 2011
RMR
Dec. 31, 2011
RMR
Restricted shares
Dec. 31, 2010
RMR
Restricted shares
Dec. 31, 2009
RMR
Restricted shares
Dec. 31, 2011
RMR
MOB
Dec. 31, 2011
RMR
Regional Offices
sqft
Property
Jun. 30, 2011
Five Star
Dec. 31, 2011
Five Star
Y
term
Feb. 17, 2012
Five Star
Feb. 17, 2012
CommonWealth REIT (CWH)
Dec. 31, 2011
CommonWealth REIT (CWH)
May 31, 2008
CommonWealth REIT (CWH)
Property
Sep. 30, 2011
CommonWealth REIT (CWH)
Acquisition
MOB
Property
sqft
Jan. 31, 2011
CommonWealth REIT (CWH)
Acquisition
MOB
sqft
Property
Dec. 31, 2010
CommonWealth REIT (CWH)
Acquisition
MOB
sqft
Property
Sep. 30, 2011
CommonWealth REIT (CWH)
Agreement to acquire
MOB
Property
sqft
Nov. 30, 2010
CommonWealth REIT (CWH)
Agreement to acquire
MOB
sqft
Property
Jun. 30, 2011
AIC
Y
Jun. 30, 2010
AIC
Dec. 31, 2011
AIC
Dec. 31, 2010
AIC
Dec. 31, 2009
AIC
Feb. 17, 2012
AIC
Related person transactions                                                                    
Number of agreements to avail management and administrative services                 2                                                  
Number of employees                 740                                                  
Annual rate of compensation payable under business management agreement as a percentage of average 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%                                            
Average 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                                                    
Management fees payable under property management agreement as a percentage of gross rents (as a percent)                               3.00%                                    
Construction supervision fees payable under property management agreement as a percentage of construction costs                               5.00%                                    
Aggregate business management and property management fees                 25,269 19,519 17,177                                              
Incentive fee                 449 192 550                                              
Pro rata share of internal audit costs                 240 211 220                                              
Period by which business management agreement and property management agreement get automatically renewed (in years)                 1                                                  
Period before which the written notice is required to be given for cancellation of business management agreement and the property management agreement (in days)                 60                                                  
Number of business days before which the notice is required to be given for termination of property management agreement (in days)                 5                                                  
Area of real estate properties leased (in square feet) 575,000                               4,100                                  
Number of properties agreed to be acquired, or agreed to be acquired, referred as leased properties                                 1                                  
Rental revenue from related party                 180 169 101                                              
Awards granted (in shares)                         72,450 66,850 63,450                                      
Aggregate value of awards granted during the period                         1,732 1,625 1,228                                      
Portion of the awards granted that vested on grant date                         One-fifth                                          
Portion of the awards granted which will vest on each of the next four anniversaries of the grant date                         One-fifth                                          
Award vesting period (in years)                         4 years                                          
Investment in common shares (in shares)                                     4,235,000 4,235,000 250,000                          
Additional number of common shares acquired (in shares)                                   1,000,000                                
Percentage of total shares outstanding                                     8.84% 8.80%                            
Maximum percentage of any class of equity shares that can be acquired without approval                                     9.80%                              
Minimum percentage of ownership of lessee's voting stock above which the entity has the option to cancel all its rights, minimum                                     9.80%                              
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%                              
Initial term of the management agreement (in years)                                     20                              
Number of consecutive renewal terms of agreement                                     2                              
Renewal period (in years)                                     15                              
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 (in years)                                     3                              
Property management agreement expense                                     835                              
Costs reimbursed                                     19,762                              
Aggregate purchase price of properties acquired, excluding closing costs         991,618 433,955 144,750                                 167,000 95,870 374,130 167,000 470,000            
Number of properties acquired or agreed to be acquired       4 28 26                                   13 6 21 13 27            
Minimum percentage of ownership of entity's common shares which are subject to investment restrictions                                           10.00%                        
Maximum number of additional identified properties that can be purchased                                             45                      
Area of real estate properties acquired (in square feet)             514,409                                 1,300,000 737,000 2,100,000 1,300,000 2,800,000            
Equity method investments, ownership percentage                                                             14.29%      
Amount invested in equity investee                                                                   5,209
Equity method investments, carrying value                                                             5,291 5,076    
Equity in earnings (losses) of an investee 139 (1) (134)                                                       139 (1) (134)  
Coverage of property insurance                                                           500,000        
Period for which property insurance program was extended (in years)                                                         1          
Total premiums                                                             $ 1,600 $ 275