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Organization Nature of Operations and Basis of Presentation (Details Textual)
 12 Months Ended
Dec. 31, 2012
Clinic
Facility
State
Dec. 31, 2010
Clinic
Organization Nature of Operations and Basis of Presentation (Textual) [Abstract]    
Number of clinics operated 431  
Number of states where clinics are operated 43  
Number of third party facilities 15  
Percentage of general partnership interest owned 1.00%  
Percentage of limited partnership interest owned 64.00%  
Number of clinic acquired 7 2
Number of separate transaction for clinic acquisition 7  
Number of clinic operated under separate partnership 2  
Number of clinic operated under existing partnership 5