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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Sep. 30, 2020 USD ($) Clinic Contract State | Feb. 27, 2020 USD ($) Partnership Clinic | Sep. 30, 2019 USD ($) Clinic Installment | Apr. 11, 2019 USD ($) Location State | Apr. 30, 2018 Business | Sep. 30, 2020 USD ($) Volume Clinic Contract State | Jun. 30, 2020 Volume | Mar. 31, 2020 Employee Volume | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Clinic Installment State Segment Facility | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) Partnership | May 02, 2020 Employee | Mar. 31, 2017
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Average physical therapy patient volumes per day per clinic | Volume |  |  |  |  |  |  | 25.8 | 18.9 | 26.2 |  |  |  |  |  |
Percentage of general partnership interest owned |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Number of partnerships | Partnership |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Number of closed clinics sold | Clinic | 12 |  |  |  |  |  | 12 |  |  |  | 12 |  |  |  |
Aggregate sale price of clinics |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |
Cash received related to sale of closed clinics | $ 700,000 |  |  |  |  |  | $ 700,000 |  |  |  | 700,000 |  |  |  |
Note receivable related to sale of closed clinics | $ 400,000 |  |  |  |  |  | $ 400,000 |  |  |  | $ 400,000 |  |  |  |
Number of installments for note receivable | Installment |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of clinics operated | Clinic | 550 |  |  |  |  |  | 550 |  |  |  | 550 |  |  |  |
Number of states where clinics are operated | State | 39 |  |  |  |  |  | 39 |  |  |  | 39 |  |  |  |
Number of third party facilities | Facility |  |  |  |  |  |  |  |  |  |  | 38 |  |  |  |
Percentage of employees furloughed or terminated |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |
Number of full and part-time workforce | Employee |  |  |  |  |  |  |  |  | 5,500 |  |  |  |  |  |
Number of furloughed employees returned | Employee |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200 |
Relief funds |  |  |  |  |  |  | $ 390,000 |  |  | $ 0 | $ 8,349,000 | $ 0 |  |  |
Deferment of depositing employer's share social security taxes included in accrued liabilities | $ 4,900,000 |  |  |  |  |  | 4,900,000 |  |  |  | 4,900,000 |  |  |  |
Long-Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long lived assets |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Impairment of long lived assets to be disposed of |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of goodwill - closed clinics |  |  |  |  |  |  | 0 |  |  | $ 0 | 1,859,000 | $ 0 | $ 0 |  |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefit |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Accrued interest and penalties associated with any unrecognized tax benefits | 0 |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |
Interest expense recognized |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Segment |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Relief funds |  |  |  |  |  |  | 400,000 |  |  |  | $ 8,300,000 |  |  |  |
Medicare Accelerated and Advance Payments Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents and accrued liabilities | 12,900,000 |  |  |  |  |  | 12,900,000 |  |  |  | 12,900,000 |  |  |  |
Public Health and Social Services Emergency Fund [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funds received | 8,300,000 |  |  |  |  |  | 8,300,000 |  |  |  | 8,300,000 |  |  |  |
Grants and other funds | $ 100,000,000,000.0 |  |  |  |  |  | 100,000,000,000.0 |  |  |  | 100,000,000,000.0 |  |  |  |
Relief funds |  |  |  |  |  |  |  |  |  |  | 8,300,000 |  |  |  |
Public Health and Social Services Emergency Fund [Member] | Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Relief funds |  |  |  |  |  |  | $ 400,000 |  |  |  | $ 8,300,000 |  |  |  |
Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 65.00% | 67.00% |  |  |  |  |  |  | 67.00% |  | 67.00% |  |  |
Number of partnerships | Partnership |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price for the acquired clinic practices |  | $ 11,900,000 | $ 12,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  | 11,600,000 | 12,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Seller note |  | $ 300,000 | $ 300,000 |  |  |  |  |  |  | $ 300,000 |  | $ 300,000 |  |  |
Percentage of interest accrued |  | 4.75% | 5.00% |  |  |  |  |  |  | 5.00% |  | 5.00% |  |  |
Number of installments | Installment |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Principal installments |  |  | $ 150,000 |  |  |  |  |  |  | $ 150,000 |  | $ 150,000 |  |  |
Number of businesses acquired | Clinic |  | 4 | 11 |  |  |  |  |  |  |  |  |  |  |  |
IIPS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states of network services | State |  |  |  | 45 |  |  |  |  |  |  |  |  |  |  |
Number of onsite client locations | Location |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  | 100.00% |  | 65.00% |  |  |  |  |  |  |  |  | 55.00%
Aggregate purchase price for the acquired clinic practices |  |  |  | $ 23,600,000 |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  | 18,900,000 |  |  |  |  |  |  |  |  |  |  |
Seller note |  |  | $ 4,000,000.0 | $ 4,000,000 | [1] |  |  |  |  | $ 4,000,000.0 |  | $ 4,000,000.0 |  |  |
Percentage of interest accrued |  |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |
Number of businesses merged | Business |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Percentage of combined business interest owned |  |  |  | 76.00% |  | 59.45% |  |  |  |  |  |  |  |  |
Management Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired | 70.00% |  |  |  |  |  | 70.00% |  |  |  | 70.00% |  |  |  |
Number of management contracts | Contract | 6 |  |  |  |  |  | 6 |  |  |  |  |  |  |  |
Remaining contract term | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Aggregate purchase price for the acquired clinic practices | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic | 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller note | 500,000 |  |  |  |  |  | $ 500,000 |  |  |  | $ 500,000 |  |  |  |
Management Contracts [Member] | Notes Payable One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller note | $ 200,000 |  |  |  |  |  | $ 200,000 |  |  |  | $ 200,000 |  |  |  |
Percentage of interest accrued | 5.00% |  |  |  |  |  | 5.00% |  |  |  | 5.00% |  |  |  |
Management Contracts [Member] | Notes Payable Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller note | $ 300,000 |  |  |  |  |  | $ 300,000 |  |  |  | $ 300,000 |  |  |  |
Percentage of interest accrued | 5.00% |  |  |  |  |  | 5.00% |  |  |  | 5.00% |  |  |  |
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% |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
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 |  |  |  |
Minimum [Member] | Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of limited partnership interest owned |  |  |  |  |  |  |  |  |  |  | 99.00% |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  |  |  |  | 55.00% |  |
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 |  |  |  |
Maximum [Member] | Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 83.80% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Management Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired | 70.00% |  |  |  |  |  | 70.00% |  |  |  | 70.00% |  |  |  |
[1] | Industrial injury prevention services

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