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Acquisition of Businesses - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
May 31, 2012
Clinic
Sep. 30, 2013
Clinic
Dec. 31, 2012
Clinic
Transactions
Sep. 16, 2013
Feb. 28, 2013
May 22, 2012
May 22, 2012
Seller Note [Member]
Feb. 28, 2013
February 2015 [Member]
Feb. 28, 2013
February 2016 [Member]
Apr. 30, 2013
April 2014 [Member]
Apr. 30, 2013
April 2015 [Member]
May 31, 2013
May 2014 [Member]
May 31, 2012
May 2014 [Member]
May 31, 2013
May 2015 [Member]
May 31, 2012
May 2013 [Member]
Sep. 30, 2013
Non Competition Agreement [Member]
Sep. 30, 2013
Referral relationships [Member]
Dec. 31, 2012
Multi Clinic [Member]
Sep. 30, 2013
Multi Clinic [Member]
Non Competition Agreement [Member]
Dec. 31, 2012
Multi Clinic [Member]
Non Competition Agreement [Member]
Sep. 30, 2013
February 2013 Acquisition [Member]
Installment
Clinic
Sep. 30, 2013
April 2013 Acquisition [Member]
Installment
Clinic
Sep. 30, 2013
May 2013 Acquisition [Member]
Installment
Clinic
Loans At Acquisition Date [Line Items]                                              
Percentage of purchase of non controlling interest   100.00%   100.00% 100.00% 70.00%                             72.00% 50.00% 80.00%
Cash paid for acquisition of interest in clinic                             $ 6,090,000     $ 1,938,000     $ 4,300,000 $ 2,400,000 $ 3,600,000
Business acquisition number of installments to payment of purchase consideration                                         2 2 2
Business acquisition, cost of acquired entity   130,000   95,000 5,000                                    
Acquisition cost payable in two principal installments including accrued interest               200,000   100,000 100,000 100,000 125,000 100,000 125,000                
Seller notes issued for acquisition of interest in clinic     350,000   800,000 250,000     200,000                            
Number of clinics     7                                   9 5 5
Percentage of Tax Deductible Goodwill           70.00%                                  
Accrued interest seller note             3.25%                                
Tradenames   1,300,000 1,300,000   600,000                                    
Purchase price allocated to referral relationships   800,000 857,000   400,000                         57,000          
Purchase price allocated to non-competition agreement     265,000                               240,000 25,000      
Values assigned being amortized to expense equally over the respective estimated life                               6 years 12 years            
Number of separate transactions for outpatient therapy practices     7                                        
Number of clinic acquired 7 1                                          
Number or transaction for notes payable purchased     1                                        
Principal amount payable                                   100,000          
Purchase price allocated to current asset                                   43,000          
Purchase price allocated to non current asset     478,000   719,000                         213,000          
Purchase price allocated to goodwill     $ 8,239,000   $ 13,399,000                         $ 1,883,000