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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Clinic
State
Jun. 30, 2013
Jun. 30, 2014
Clinic
State
Jun. 30, 2013
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 clinics operated 486   486  
Number of states where clinics are operated 43   43  
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