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Organization Nature of Operations and Basis of Presentation (Tables) (Multi-Clinic Acquisitions [Member])
12 Months Ended
Dec. 31, 2012
Multi-Clinic Acquisitions [Member]
 
Business Acquisition [Line Items]  
Schedule of multi clinic acquisition
             

Acquisition

  Date   % Interest
Acquired
  Number of
Clinics
       
    2012        

May 2012 Acquisition

  May 22   70%   7
       
    2011        

July 2011 Acquisition

  July 25   51%   20
       
    2010        

February 2010 Acquisition

  February 26   70%   5

December 21, 2010 Acquisition

  December 21   70%   6

December 31, 2010 Acquisition

  December 31   65%   14