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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) Clinic State Region | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Clinic State Facility | Sep. 30, 2016 USD ($) | Nov. 02, 2017 | Nov. 02, 2015 | Apr. 01, 2013
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of general partnership interest owned |  |  | 1.00% |  |  |  |
Number of clinic practices acquired | Clinic |  |  | 2 |  |  |  |
Number of clinics consolidated with an existing clinics | Clinic | 1 |  | 1 |  |  |  |
Number of clinics operates as a satellite clinic with existing partnerships | Clinic | 1 |  | 1 |  |  |  |
Number of clinics operated | Clinic | 569 |  | 569 |  |  |  |
Number of states where clinics are operated | State | 41 |  | 41 |  |  |  |
Number of third party facilities | Facility |  |  | 30 |  |  |  |
Number of regions | Region | 6 |  |  |  |  |  |
Federal debt ceiling in connection with deficit reductions |  |  | 10 years |  |  |  |
Reductions in federal spending |  |  | $ 1,200,000,000,000 |  |  |  |
Medicare spending cut percentage |  |  | 2.00% |  |  |  |
Expected reduction in Medicare spending percentage |  |  |  |  |  | 2.00% | 2.00%
Combined physical therapy/speech language pathology expenses |  |  | $ 3,700 |  |  |  |
Percentage of practice expense component |  |  | 100.00% |  |  |  |
Percentage reduction for service |  |  | 50.00% |  |  |  |
Net revenue from Medicare accounts |  |  | $ 68,500,000 |  |  |  |
Difference between net revenues and corresponding cash collections, approximately of net revenues |  |  | 1.00% |  |  |  |
Difference between actual aggregate contractual reserve and estimated contractual allowance reserve percentage |  |  | 1.00% |  |  |  |
Maximum contractual allowance reserve estimate |  |  | 1.00% |  |  |  |
Unrecognized tax benefit |  |  | $ 0 |  |  |  |
Accrued interest and penalties associated with any unrecognized tax benefits | $ 0 |  | 0 |  |  |  |
Interest expense recognized |  |  | 0 |  |  |  |
Increase in earnings by decreasing the tax provision due to adoption of new accounting treatment | 3,132,000 | $ 2,753,000 | 8,029,000 | $ 8,727,000 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Increase in earnings by decreasing the tax provision due to adoption of new accounting treatment | $ 200,000 | $ 200,000 | $ 1,100,000 | $ 800,000 |  |  |
Year 2017 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of increase in medicare payment rates |  |  | 0.24% |  |  |  |
Year 2018 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of increase in medicare payment rates |  |  | 0.50% |  |  |  |
Year 2018 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Expected reduction in Medicare spending percentage |  |  |  |  | 2.00% |  |
Year 2019 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of increase in medicare payment rates |  |  | 0.50% |  |  |  |
March 2017 Acquisition [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of interest acquired | 55.00% |  | 55.00% |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of limited partnership interest owned |  |  | 49.00% |  |  |  |
Mandatorily redeemable non-controlling interest, redemption rights, commencement period |  |  | 3 years |  |  |  |
Redeemable non-controlling interest, redemption rights, commencement period |  |  | 3 years |  |  |  |
Minimum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |
Minimum [Member] | Software [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Percentage of limited partnership interest owned |  |  | 99.00% |  |  |  |
Mandatorily redeemable non-controlling interest, redemption rights, commencement period |  |  | 5 years |  |  |  |
Redeemable non-controlling interest, redemption rights, commencement period |  |  | 5 years |  |  |  |
Maximum [Member] | Year 2017 [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Annual limit on physical therapy and speech language pathology services |  |  | $ 1,980 |  |  |  |
Annual limit occupational therapy services |  |  | $ 1,980 |  |  |  |
Maximum [Member] | Furniture & Equipment [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 8 years |  |  |  |
Maximum [Member] | Software [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 7 years |  |  |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |  |  |  |
Depreciation Amortization Impairment [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 5 years |  |  |  |

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