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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Clinic
State
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Clinic
State
Segment
Region
Sep. 30, 2014
USD ($)
Dec. 31, 2014
Clinic
Depreciation Amortization Impairment [Line Items]          
Percentage of general partnership interest owned     1.00%    
Percentage of limited partnership interest owned     64.00%    
Number of individual clinics acquired in separate transactions | Clinic     1   4
Number of clinics operated | Clinic 506   506    
Number of states where clinics are operated | State 42   42    
Number of business segments | Segment     1    
Number of regions | Region     6    
Percentage increase (decrease) of medicare payment     0.00%    
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%        
Combined physical therapy/speech language pathology expenses     $ 3,700    
Percentage of practice expense component     100.00%    
Percentage reduction for service     20.00%    
Percentage reduction for service in institutional settings     25.00%    
Percentage of increased payment reduction     50.00%    
Difference between net revenues and corresponding cash collections, approximately of net revenues     1.00%    
Maximum difference between actual aggregate contractual reserve and estimated contractual allowance reserve     1.00%    
Minimum difference between actual aggregate contractual reserve and estimated contractual allowance reserve     1.00%    
Minimum percentage of fair value reporting unit less than carrying amount     50.00%    
Unrecognized tax benefit $ 0 $ 0 $ 0 $ 0  
Accrued interest and penalties associated with any unrecognized tax benefits 0 0 0 0  
Interest expense recognized $ 0 0 $ 0 $ 0  
Year 2016 [Member]          
Depreciation Amortization Impairment [Line Items]          
Percentage increase (decrease) of medicare payment     (0.30%)    
Expected reduction in Medicare spending percentage 2.00%   2.00%    
Year 2017 [Member]          
Depreciation Amortization Impairment [Line Items]          
Expected reduction in Medicare spending percentage 2.00%   2.00%    
July 1, 2015 through December 31, 2015 [Member]          
Depreciation Amortization Impairment [Line Items]          
Percentage increase (decrease) of medicare payment     0.50%    
From 2017 through 2019 [Member]          
Depreciation Amortization Impairment [Line Items]          
Percentage increase (decrease) of medicare payment     0.50%    
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]          
Annual limit on physical therapy and speech language pathology services   1,920 $ 1,940    
Annual limit occupational therapy services   $ 1,920 1,940    
Maximum [Member] | Year 2016 [Member]          
Depreciation Amortization Impairment [Line Items]          
Annual limit on physical therapy and speech language pathology services     1,960    
Annual limit occupational therapy services     $ 1,960    
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