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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) State Installment Clinic | Apr. 11, 2019 USD ($) State Location | Aug. 31, 2018 USD ($) Installment Clinic | Apr. 30, 2018 USD ($) Business | Feb. 28, 2018 Clinic | Mar. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) State Installment Clinic Facility Region | Dec. 31, 2018 USD ($) Clinic | Sep. 30, 2018 USD ($)
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  | $ 5,700,000 |  |
Seller notes | $ 283,000 |  |  | $ 950,000 |  |  | $ 283,000 |  | $ 0
Business acquisition number of installments for payment of purchase consideration | Installment |  |  |  |  |  |  | 2 |  |
Percentage of general partnership interest owned |  |  |  |  |  |  | 1.00% |  |
Number of clinic practices acquired | Clinic |  |  | 4 |  | 2 |  |  | 5 |
Number of clinics operated | Clinic | 574 |  |  |  |  |  | 574 |  |
Number of states where clinics are operated | State | 41 |  |  |  |  |  | 41 |  |
Number of third party facilities | Facility |  |  |  |  |  |  | 26 |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |
Number of regions | Region |  |  |  |  |  |  | 6 |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |
Unrecognized tax benefit |  |  |  |  |  |  | $ 0 |  |
Accrued interest and penalties associated with any unrecognized tax benefits | $ 0 |  |  |  |  |  | 0 |  |
Interest expense recognized |  |  |  |  |  |  | 0 |  |
Recently Adopted Accounting Guidance [Abstract] |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets | 79,793,000 |  |  |  |  |  | 79,793,000 | $ 0 |
Lease Liability | 84,565,000 |  |  |  |  |  | 84,565,000 |  |
ASU 2016-02 [Member] |  |  |  |  |  |  |  |  |
Recently Adopted Accounting Guidance [Abstract] |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets | 78,000,000 |  |  |  |  |  | 78,000,000 |  |
Lease Liability | 82,600,000 |  |  |  |  |  | $ 82,600,000 |  |
April 2019 Acquisition [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  | Apr. 11, 2019 |  |
Number of states of network services | State |  | 45 |  |  |  |  |  |  |
Number of onsite client locations | Location |  | 11 |  |  |  |  |  |  |
Percentage of interest acquired |  | 76.00% |  |  |  |  |  |  |
Aggregate purchase price for the acquired clinic practices |  | $ 23,600,000 |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  | 19,600,000 |  |  |  |  |  |  |
Payable to shareholders of seller | $ 500,000 | 502,000 |  |  |  |  | $ 500,000 |  |
Seller notes |  | $ 4,000,000 |  |  |  |  |  |  |
Percentage of interest accrued |  | 5.50% |  |  |  |  |  |  |
September 2019 Acquisition [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  | Sep. 30, 2019 |  |
Percentage of interest acquired | 67.00% |  |  |  |  |  | 67.00% |  |
Aggregate purchase price for the acquired clinic practices | $ 12,400,000 |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic | 12,100,000 |  |  |  |  |  |  |  |
Seller notes | $ 300,000 |  |  |  |  |  | $ 300,000 |  |
Percentage of interest accrued | 5.00% |  |  |  |  |  | 5.00% |  |
Business acquisition number of installments for payment of purchase consideration | Installment | 2 |  |  |  |  |  |  |  |
Number of clinic practices acquired | Clinic | 11 |  |  |  |  |  |  |  |
September 2019 Acquisition [Member] | September 2020 [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest | $ 150,000 |  |  |  |  |  |  |  |
September 2019 Acquisition [Member] | September 2021 [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest | $ 150,000 |  |  |  |  |  |  |  |
August 2018 Acquisition [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  | Aug. 31, 2018 |  |
Percentage of interest acquired |  |  | 70.00% |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  | $ 7,300,000 |  |  |  |  |  |
Seller notes |  |  | $ 400,000 |  |  |  |  |  |
Business acquisition number of installments for payment of purchase consideration | Installment |  |  | 2 |  |  |  |  |  |
Number of clinic practices acquired | Clinic |  |  | 4 |  |  |  |  |  |
August 2018 Acquisition [Member] | August 2019 [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  | $ 200,000 |  |  |  |  |  |
August 2018 Acquisition [Member] | August 2020 [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  | $ 200,000 |  |  |  |  |  |
March 2017 Acquisition [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  | 55.00% |  |  |
Industrial Injury Prevention [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  | 65.00% |  | 55.00% |  |  |
Cash paid for acquisition of interest in clinic |  |  |  | $ 8,600,000 |  | $ 6,200,000 |  |  |
Seller notes |  |  |  | $ 400,000 |  | $ 400,000 |  |  |
Number of businesses merged | Business |  |  |  | 2 |  |  |  |  |
Percentage of combined business interest owned |  |  |  | 59.45% |  |  |  |  |
Employee [Member] |  |  |  |  |  |  |  |  |
Restricted Stock [Abstract] |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  | 4 years |  |
Director [Member] |  |  |  |  |  |  |  |  |
Restricted Stock [Abstract] |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  | 1 year |  |
Officer [Member] |  |  |  |  |  |  |  |  |
Restricted Stock [Abstract] |  |  |  |  |  |  |  |  |
Period in which restrictions lapse on stock granted |  |  |  |  |  |  | 4 years |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Percentage of limited partnership interest owned |  |  |  |  |  |  | 49.00% |  |
Redeemable Non-Controlling Interests [Abstract] |  |  |  |  |  |  |  |  |
Redeemable non-controlling interest, redemption rights, commencement period |  |  |  |  |  |  | 3 years |  |
Minimum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 3 years |  |
Minimum [Member] | Software [Member] |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 3 years |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |
Percentage of limited partnership interest owned |  |  |  |  |  |  | 99.00% |  |
Redeemable Non-Controlling Interests [Abstract] |  |  |  |  |  |  |  |  |
Redeemable non-controlling interest, redemption rights, commencement period |  |  |  |  |  |  | 5 years |  |
Maximum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 8 years |  |
Maximum [Member] | Software [Member] |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 7 years |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 5 years |  |

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