Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill [Abstract]  
Summary of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill as of December 31, 2016 and 2015 consisted of the following (in thousands):

  
Year Ended
December 31, 2016
  
Year Ended
December 31, 2015
 
     
(as restated)
 
Beginning balance, as restated
 
$
195,373
  
$
171,740
 
Goodwill acquired during the period
  
31,419
   
23,437
 
Goodwill adjustments for purchase price allocation of business acquired
  
14
   
376
 
Goodwill written-off - closed clinics
  
-
   
(180
)
Ending balance
 
$
226,806
  
$
195,373