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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Clinic
State
Mar. 31, 2013
Mar. 31, 2014
Year 2016
Mar. 31, 2014
Through December 31, 2014
Mar. 31, 2014
January 1, 2015 through March 31, 2015
Mar. 31, 2014
Minimum
Furniture & equipment
Mar. 31, 2014
Minimum
Computer Software, Intangible Asset
Mar. 31, 2014
Minimum
Leasehold Improvements
Mar. 31, 2014
Maximum
Dec. 31, 2013
Maximum
Mar. 31, 2014
Maximum
Furniture & equipment
Mar. 31, 2014
Maximum
Computer Software, Intangible Asset
Mar. 31, 2014
Maximum
Leasehold Improvements
Depreciation Amortization Impairment [Line Items]                          
Percentage of general partnership interest owned 1.00%                        
Percentage of limited partnership interest owned 64.00%                        
Number of clinics operated 472                        
Number of states where clinics are operated 43                        
Estimated useful lives           3 years 3 years 3 years     8 years 7 years 5 years
Percentage of reduction prevented in Medicare Fee rate 20.10%                        
Medicare service fees, description 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                        
Percentage of increase in payment for service       0.50%                  
Percentage 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%                        
Expected reduction in Medicare spending percentage 2.00%   2.00%                    
Annual limit on physical therapy and speech language pathology services                 1,920 1,900      
Annual limit occupational therapy services                 1,920 1,900      
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 reduction for service in institutional settings 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                      
Interest expense recognized $ 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                        
Prior Period Reclassification Adjustment Description Prior period amounts have been reclassified to conform to current period presentation due to discontinued operations recognized in 2013