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Significant Accounting Policies - Additional information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Depreciation Amortization Impairment [Line Items]      
Exercisable non controlling interest with put rights   $ 0  
Percentage of reduction prevented in Medicare Fee rate 20.10%    
Effective date of reduction in Medicare physician fee payment rate Apr. 01, 2013    
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%    
Effective date of change in annual limit on outpatient therapy services Jan. 01, 2014    
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  
Accrued interest and penalties associated with any unrecognized tax benefits 0 0 0
Interest expense recognized 0 0  
Stock option compensation 0 0 0
Number of Shares, Granted 648,346    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 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 2.00%    
Minimum [Member]
      
Depreciation Amortization Impairment [Line Items]      
Combined physical therapy/speech language pathology expenses 3,700    
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 1,900    
Annual limit occupational therapy services 1,900    
Maximum [Member] | Effective Date One [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