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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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