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Noncontrolling Interest in Consolidated Subsidiary (Tables)
 12 Months Ended
Dec. 31, 2013
Noncontrolling Interest in Consolidated Subsidiary  
Summary of changes in the entity's ownership interest in SIR and the effects on the equity attributable to the entity

 

 

 
   CommonWealth
REIT
Ownership
Percentage of
SIR After
Transaction		   Effect on the
Equity
Attributable to
CommonWealth
REIT Common
Shareholders		  

Year Ended December 31, 2012:

              

Increase in noncontrolling interest related to the SIR IPO in March 2012

     70.5 % ($ 23,857 )

Increase in noncontrolling interest related to the issuance of SIR common shares pursuant to its equity compensation plan in September 2012

    
70.4
%		  
(253
)

Increase in noncontrolling interest related to the issuance of SIR common shares in December 2012

    
56.0
%		  
(707
)
             
​ ​ ​ ​ ​ ​ ​ ​

 

         ($ 24,817 )
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
             

Year Ended December 31, 2013:

              

Increase in noncontrolling interest related to the issuance of SIR common shares pursuant to its equity compensation plan in May 2013

     55.99 % $ 32  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​