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