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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 11, 2019 USD ($) State Location | Aug. 31, 2018 Clinic | Apr. 30, 2018 Business | Feb. 28, 2018 Clinic | Mar. 31, 2019 USD ($) Clinic State Facility Region | Dec. 31, 2018 USD ($) Clinic | May 31, 2017
Basis of Presentation [Abstract] |  |  |  |  |  |  |
Percentage of general partnership interest owned |  |  |  |  | 1.00% |  |
Number of clinic practices acquired | Clinic |  | 4 |  | 2 |  | 5 |
Number of clinics operated | Clinic |  |  |  |  | 590 |  |
Number of states where clinics are operated | State |  |  |  |  | 41 |  |
Number of third party facilities | Facility |  |  |  |  | 28 |  |
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 |  |
Interest expense recognized |  |  |  |  | 0 |  |
Recently Adopted Accounting Guidance [Abstract] |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  | 77,870,000 | $ 0 |
Lease Liability |  |  |  |  | 82,567,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |
Percentage of combined business interest owned | 76.00% |  |  |  |  |  |
ASU 2016-02 [Member] |  |  |  |  |  |  |
Recently Adopted Accounting Guidance [Abstract] |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  | 78,000,000 |  |
Lease Liability |  |  |  |  | $ 82,600,000 |  |
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%
Number of businesses merged | Business |  |  | 2 |  |  |  |
Percentage of combined business interest owned |  |  | 59.45% |  |  |  |
Industrial Injury Prevention [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |
Number of states where clinics are operated | State | 45 |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |
Number of onsite client locations | Location | 11 |  |  |  |  |  |
Total consideration | $ 23,600,000 |  |  |  |  |  |
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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