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ACQUISITIONS OF BUSINESSES (Details) |  |  |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2017 USD ($) Clinic Installment | Mar. 23, 2017 USD ($) | Jan. 01, 2017 USD ($) Clinic Installment | Nov. 30, 2016 USD ($) Clinic Installment | Feb. 29, 2016 USD ($) Clinic Installment | Jun. 30, 2017 USD ($) Clinic Installment | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) Subsidiary
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  |  |  |  | $ 1,650,000 |  | $ 1,000,000
Number of subsidiaries acquired clinic practices | Subsidiary |  |  |  |  |  |  |  | 2
Aggregate purchase price for the acquired clinic practices |  |  |  |  |  |  |  | $ 75,000
Cash paid, net of cash acquired |  |  |  |  |  | 33,665,000 | $ 12,958,000 | 23,623,000
Seller notes |  |  |  |  |  | 1,650,000 |  | 1,000,000
Total consideration |  |  |  |  |  | 35,315,000 |  | 24,623,000
Estimated fair value of net tangible assets acquired [Abstract] |  |  |  |  |  |  |  |
Total current assets |  |  |  |  |  | 5,868,000 |  | 1,763,000
Total non-current assets |  |  |  |  |  | 1,790,000 |  | 839,000
Total liabilities |  |  |  |  |  | (1,919,000) |  | (1,039,000)
Net tangible assets acquired |  |  |  |  |  | 5,739,000 |  | 1,563,000
Referral relationships |  |  |  |  |  | 4,693,000 |  | 4,919,000
Non-compete |  |  |  |  |  | 1,790,000 |  | 847,000
Tradename |  |  |  |  |  | 5,118,000 |  | 3,802,000
Goodwill |  |  |  |  |  | 40,197,000 |  | 32,371,000
Fair value of non-controlling interest (classified as redeemable non-controlling interests) |  |  |  |  |  | (11,940,000) |  |
Fair value of non-controlling interest (classified as mandatorily redeemable non-controlling interests) |  |  |  |  |  | (10,282,000) |  | (18,879,000)
Total consideration |  |  |  |  |  | $ 35,315,000 |  | $ 24,623,000
Referral Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  | 12 years |  |
Referral Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  | 13 years |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  | 6 years |  |
Acquisition of Seventeen Clinic Practices [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of clinic practices acquired | Clinic |  |  | 17 |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  | 70.00%
Cash paid for acquisition of interest in clinic |  |  | $ 10,700,000 |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  |  |  |  |  |  | $ 500,000
Business acquisition number of installments to payment of purchase consideration | Installment |  |  | 2 |  |  |  |  |
Seller notes |  |  |  |  |  |  |  | $ 500,000
Acquisition of Seventeen Clinic Practices [Member] | January 2018 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  | $ 250,000 |  |  |  |  |
Acquisition of Seventeen Clinic Practices [Member] | January 2019 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  | $ 250,000 |  |  |  |  |
Workforce Performance Solutions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 55.00% |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  | $ 6,200,000 |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  | 400,000 |  |  |  |  |  |
Seller notes |  | $ 400,000 |  |  |  |  |  |
Acquisition Of Four Clinic Practices [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of clinic practices acquired | Clinic | 4 |  |  |  |  |  |  |
Percentage of interest acquired | 70.00% |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic | $ 2,300,000 |  |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic | $ 250,000 |  |  |  |  |  |  |
Business acquisition number of installments to payment of purchase consideration | Installment | 2 |  |  |  |  |  |  |
Seller notes | $ 250,000 |  |  |  |  |  |  |
Acquisition Of Four Clinic Practices [Member] | May 2018 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest | 125,000 |  |  |  |  |  |  |
Acquisition Of Four Clinic Practices [Member] | May 2019 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest | $ 125,000 |  |  |  |  |  |  |
Acquisition Of Nine Clinic Practices [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of clinic practices acquired | Clinic |  |  |  |  |  | 9 |  |
Percentage of interest acquired |  |  |  |  |  | 60.00% |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  | $ 15,800,000 |  |
Seller notes issued for acquisition of interest in clinic |  |  |  |  |  | $ 500,000 |  |
Business acquisition number of installments to payment of purchase consideration | Installment |  |  |  |  |  | 2 |  |
Seller notes |  |  |  |  |  | $ 500,000 |  |
Acquisition Of Nine Clinic Practices [Member] | June 2018 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  | 250,000 |  |
Acquisition Of Nine Clinic Practices [Member] | June 2019 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  | 250,000 |  |
Acquisition Of Twelve Clinic Practices [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of clinic practices acquired | Clinic |  |  |  | 12 |  |  |  |
Percentage of interest acquired |  |  |  | 60.00% |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  | $ 11,000,000 |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  |  | $ 500,000 |  |  |  |
Business acquisition number of installments to payment of purchase consideration | Installment |  |  |  | 2 |  |  |  |
Seller notes |  |  |  | $ 500,000 |  |  |  |
Acquisition Of Twelve Clinic Practices [Member] | November 2017 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  | 250,000 |  |  |  |
Acquisition Of Twelve Clinic Practices [Member] | November 2018 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  | $ 250,000 |  |  |  |
Acquisition Of Eight Clinic Practices [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of clinic practices acquired | Clinic |  |  |  |  | 8 |  |  |
Percentage of interest acquired |  |  |  |  | 55.00% |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  | $ 13,200,000 |  |  |
Seller notes issued for acquisition of interest in clinic |  |  |  |  | $ 500,000 |  |  |
Business acquisition number of installments to payment of purchase consideration | Installment |  |  |  |  | 2 |  |  |
Seller notes |  |  |  |  | $ 500,000 |  |  |
Acquisition Of Eight Clinic Practices [Member] | February 2017 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  | 250,000 |  |  |
Acquisition Of Eight Clinic Practices [Member] | February 2018 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  | $ 250,000 |  |  |
Acquisition Of Single Clinic Practice [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  | $ 100,000 |  |

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