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ACQUISITIONS OF BUSINESSES - Additional Information (Details) (USD $)
 0 Months Ended 6 Months Ended 12 Months Ended
Sep. 16, 2013
Jun. 01, 2013
Feb. 01, 2013
Jun. 30, 2014
Dec. 31, 2013
Clinic
Sep. 16, 2013
Jun. 01, 2013
Feb. 01, 2013
Business Acquisition [Line Items]                
Number of multi-clinic acquisitions         5      
Percentage of interest acquired (in hundredths)           100.00% 100.00% 100.00%
Business acquisition cost of acquired entity debt issued       $ 400,000 $ 1,300,000      
Business acquisition, cost of acquired entity 130,000 95,000 5,000 11,150,000 47,928,000      
February 2014 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest         200,000      
February 2015 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest         200,000      
April 2014 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest         100,000      
April 2015 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest       200,000 100,000      
April 2016 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest       200,000        
May 2014 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest         100,000      
May 2015 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest         100,000      
December 2014 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest         250,000      
December 2015 [Member]
                
Business Acquisition [Line Items]                
Acquisition cost payable in two principal installments including accrued interest         250,000      
Acquisition Of Thirteen Clinic Practices [Member]
                
Business Acquisition [Line Items]                
Number of clinic practices acquired       13        
Cash paid for acquisition of interest in clinic       10,625,000        
Percentage of interest acquired (in hundredths)       70.00%        
Business acquisition number of installments to payment of purchase consideration       2        
Acquisition Of Two Clinic Practices [Member]
                
Business Acquisition [Line Items]                
Number of clinic practices acquired       2        
Cash paid for acquisition of interest in clinic       125,000        
Acquisition Of Clinics On Separate Transactions[Member]
                
Business Acquisition [Line Items]                
Number of clinic practices acquired         3      
February 2013 Acquisition [Member]
                
Business Acquisition [Line Items]                
Number of clinic practices acquired         9      
Cash paid for acquisition of interest in clinic         4,300,000      
Percentage of interest acquired (in hundredths)         72.00%      
Business acquisition cost of acquired entity debt issued         400,000      
Business acquisition number of installments to payment of purchase consideration         2      
April 2013 Acquisition [Member]
                
Business Acquisition [Line Items]                
Number of clinic practices acquired         5      
Cash paid for acquisition of interest in clinic         2,400,000      
Percentage of interest acquired (in hundredths)         50.00%      
Business acquisition cost of acquired entity debt issued         200,000      
Business acquisition number of installments to payment of purchase consideration         2      
May 2013 Acquisition [Member]
                
Business Acquisition [Line Items]                
Number of clinic practices acquired         5      
Cash paid for acquisition of interest in clinic         3,600,000      
Percentage of interest acquired (in hundredths)         80.00%      
Business acquisition cost of acquired entity debt issued         200,000      
Business acquisition number of installments to payment of purchase consideration         2      
December 9, 2013 Acquisition [Member]
                
Business Acquisition [Line Items]                
Number of clinic practices acquired         12      
Cash paid for acquisition of interest in clinic         1,700,000      
Percentage of interest acquired (in hundredths)         60.00%      
December 13, 2013 Acquisition [Member]
                
Business Acquisition [Line Items]                
Number of clinic practices acquired         11      
Cash paid for acquisition of interest in clinic         35,500,000      
Percentage of interest acquired (in hundredths)         90.00%      
Business acquisition cost of acquired entity debt issued         $ 500,000      
Business acquisition number of installments to payment of purchase consideration         2