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Organization, Nature of Operations and Basis of Presentation - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2013
Clinic
Facility
State
Dec. 31, 2012
Clinic
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Number of clinics operated 472  
Number of states where clinics are operated 43  
Number of third party facilities 18  
Percentage of general partnership interest owned 1.00%  
Percentage of limited partnership interest owned 64.00%  
Number of clinic practices acquired 3 7
Number of clinic practices operated under separate partnership 2 2
Number of clinic practices operated under existing partnership 5 5
Number of Clinics 5