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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
State
Clinic
Sep. 30, 2013
Sep. 30, 2014
Segment
Region
Clinic
State
Sep. 30, 2013
Dec. 31, 2013
Subsidiary
Clinic
Depreciation Amortization Impairment [Line Items]          
Percentage of general partnership interest owned (in hundredths)     1.00%    
Percentage of limited partnership interest owned (in hundredths)     64.00%    
Number of individual clinics acquired in separate transactions     3   3
Number of acquired clinics operate as a satellite of the entity's partnerships     2    
Number of subsidiaries         3
Number of clinics operated 489   489    
Number of states where clinics are operated 42   42    
Number of business segments     1    
Number of regions     6    
Percentage of reduction prevented in Medicare Fee rate (in hundredths)     20.10%    
Medicare service fees, description     The Protecting Access to Medicare Act of 2014 temporarily blocks this reduction through March 31, 2015 and replaces it with a 0.5% payment increase for services provided through December 31, 2014 and a 0% payment update from January 1, 2015 through March 31, 2015.    
Federal debt ceiling in connection with deficit reductions     10 years    
Reductions in federal spending     $ 1,200,000,000,000    
Medicare spending cut percentage (in hundredths)     2.00%    
Expected reduction in Medicare spending percentage (in hundredths) 2.00%   2.00%    
Combined physical therapy/speech language pathology expenses     3,700    
Percentage of practice expense component (in hundredths)     100.00%    
Percentage reduction for service (in hundredths)     20.00%    
Percentage reduction for service in institutional settings (in hundredths)     25.00%    
Percentage of increased payment reduction (in hundredths)     50.00%    
Difference between net revenues and corresponding cash collections, approximately of net revenues (in hundredths)     1.00%    
Maximum difference between actual aggregate contractual reserve and estimated contractual allowance reserve (in hundredths)     1.00%    
Minimum difference between actual aggregate contractual reserve and estimated contractual allowance reserve (in hundredths)     1.00%    
Minimum percentage of fair value reporting unit less than carrying amount (in hundredths)     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  
Shares granted to employees lapse in equal installments on the following four or five annual anniversaries of the date of grant     Shares granted to directors lapse in four equal quarterly installments and those to employees lapse in equal installments on the following four or five annual anniversaries of the date of grant    
Year 2016 [Member]
          
Depreciation Amortization Impairment [Line Items]          
Expected reduction in Medicare spending percentage (in hundredths) 2.00%   2.00%    
Through December 31, 2014 [Member]
          
Depreciation Amortization Impairment [Line Items]          
Percentage of increase in payment for service (in hundredths)     0.50%    
January 1, 2015 through March 31, 2015 [Member]
          
Depreciation Amortization Impairment [Line Items]          
Percentage of medicare payment (in hundredths)     0.00%    
Minimum [Member] | Furniture & equipment [Member]
          
Depreciation Amortization Impairment [Line Items]          
Estimated useful lives     3 years    
Minimum [Member] | Computer Software, Intangible Asset [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    
Annual limit occupational therapy services     $ 1,920    
Maximum [Member] | Furniture & equipment [Member]
          
Depreciation Amortization Impairment [Line Items]          
Estimated useful lives     8 years    
Maximum [Member] | Computer Software, Intangible Asset [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