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ACQUISITIONS OF BUSINESSES - Additional Information (Details) (USD $) | 0 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
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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 |  |  |

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