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Basis of Presentation and Significant Accounting Policies - Additional information (Detail) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
May 31, 2012
Clinic
Jun. 30, 2013
State
Clinic
Jun. 30, 2012
Jun. 30, 2013
Facility
Clinic
State
Jun. 30, 2012
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Jun. 30, 2013
Furniture & equipment [Member]
Minimum [Member]
Jun. 30, 2013
Furniture & equipment [Member]
Maximum [Member]
Jun. 30, 2013
Computer Software, Intangible Asset [Member]
Minimum [Member]
Jun. 30, 2013
Computer Software, Intangible Asset [Member]
Maximum [Member]
Jun. 30, 2013
Leasehold improvements [Member]
Minimum [Member]
Jun. 30, 2013
Leasehold improvements [Member]
Maximum [Member]
Depreciation Amortization Impairment [Line Items]                            
Percentage of general partnership interest owned       1.00%                    
Percentage of limited partnership interest owned       64.00%                    
Number of clinic acquired 7     1                    
Number of clinics operated   449   449                    
Number of states where clinics are operated   43   43                    
Estimated useful lives                 3 years 8 years 3 years 7 years 3 years 5 years
Percentage of reduction prevented       26.50%                    
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%   2.00%                    
Annual limit on physical therapy and speech language pathology services             1,900 1,880            
Annual limit occupational therapy services             1,900 1,880            
Combined physical therapy/speech language pathology expenses           3,700                
Occupational therapy cap 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%                    
Reduction in overall reimbursement for services Company provides to Medicare beneficiaries.           8.00% 10.00%              
Percentage of increased payment reduction       50.00%                    
Number of physician services facilities       1                    
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%                    
Accrued interest and penalties associated with any unrecognized tax benefits   0 0 0 0                  
Unrecognized tax benefit   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 employees lapse in equal installments on the following four or five annual anniversaries of the date of grant.