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ACQUISITIONS OF BUSINESSES - Additional Information (Details) (USD $)
 0 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 12 Months Ended
Sep. 16, 2013
Jun. 01, 2013
Feb. 01, 2013
Sep. 30, 2014
Dec. 31, 2013
Clinic
Sep. 16, 2013
Jun. 01, 2013
Feb. 01, 2013
Dec. 31, 2013
February 2014 [Member]
Dec. 31, 2013
February 2015 [Member]
Dec. 31, 2013
April 2014 [Member]
Sep. 30, 2014
April 2015 [Member]
Dec. 31, 2013
April 2015 [Member]
Sep. 30, 2014
April 2016 [Member]
Dec. 31, 2013
May 2014 [Member]
Dec. 31, 2013
May 2015 [Member]
Dec. 31, 2013
December 2014 [Member]
Dec. 31, 2013
December 2015 [Member]
Sep. 30, 2014
Acquisition Of Thirteen Clinic Practices [Member]
Installment
Clinic
Aug. 01, 2014
Acquisition Of Three Clinic Practices [Member]
Clinic
Sep. 30, 2014
Acquisition Of Three Clinic Practices [Member]
Clinic
Aug. 01, 2014
Acquisition Of Three Clinic Practices [Member]
Dec. 31, 2013
Acquisition Of Clinics On Separate Transactions[Member]
Clinic
Dec. 31, 2013
February 2013 Acquisition [Member]
Clinic
Installment
Dec. 31, 2013
April 2013 Acquisition [Member]
Clinic
Installment
Dec. 31, 2013
May 2013 Acquisition [Member]
Installment
Clinic
Dec. 31, 2013
December 9, 2013 Acquisition [Member]
Clinic
Dec. 31, 2013
December 13, 2013 Acquisition [Member]
Clinic
Installment
Business Acquisition [Line Items]                                                        
Number of clinic practices acquired                                     13 3 3   3 9 5 5 12 11
Cash paid for acquisition of interest in clinic                                     $ 10,625,000 $ 1,050,000 $ 565,000     $ 4,300,000 $ 2,400,000 $ 3,600,000 $ 1,700,000 $ 35,500,000
Number of multi-clinic acquisitions         5                                              
Percentage of interest acquired (in hundredths)           100.00% 100.00% 100.00%                     70.00%     100.00%   72.00% 50.00% 80.00% 60.00% 90.00%
Seller notes issued for acquisition of interest in clinic       400,000 1,300,000                           400,000         400,000 200,000 200,000   500,000
Business acquisition number of installments to payment of purchase consideration                                     2         2 2 2   2
Acquisition cost payable in two principal installments including accrued interest                 200,000 200,000 100,000 200,000 100,000 200,000 100,000 100,000 250,000 250,000                    
Business acquisition, cost of acquired entity $ 130,000 $ 95,000 $ 5,000 $ 12,640,000 $ 47,898,000