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Acquisition of Businesses - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Transactions
Sep. 16, 2013
Jun. 01, 2013
Feb. 01, 2013
Dec. 31, 2013
February 2014
Dec. 31, 2013
February 2015
Dec. 31, 2013
April 2014
Dec. 31, 2013
April 2015
Dec. 31, 2013
May 2014
Dec. 31, 2013
May 2015
Dec. 31, 2013
December 2014
Dec. 31, 2013
December 2015
Mar. 31, 2014
Acquisition Of Two Clinic Practices
Clinic
Dec. 31, 2013
Acquisition Of Clinics On Separate Transactions
Clinic
Dec. 31, 2013
February 2013 Acquisition
Installment
Dec. 31, 2013
April 2013 Acquisition
Installment
Dec. 31, 2013
May 2013 Acquisition
Installment
Dec. 31, 2013
December 9, 2013 Acquisition
Dec. 31, 2013
December 13, 2013 Acquisition
Installment
Business Acquisition [Line Items]                                      
Number of clinic practices acquired                         2 3          
Cash paid for acquisition of interest in clinic                         $ 125,000   $ 4,300,000 $ 2,400,000 $ 3,600,000 $ 1,700,000 $ 35,500,000
Number of multi-clinic acquisitions 5                                    
Percentage of interest acquired   100.00% 100.00% 100.00%                     72.00% 50.00% 80.00% 60.00% 90.00%
Seller notes issued for acquisition of interest in clinic 1,300,000                           400,000 200,000 200,000   500,000
Business acquisition number of installments to payment of purchase consideration                             2 2 2   2
Acquisition cost payable in two principal installments including accrued interest         200,000 200,000 100,000 100,000 100,000 100,000 250,000 250,000              
Business acquisition, cost of acquired entity   $ 130,000 $ 95,000 $ 5,000