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Intangible Assets, Net - Intangible Assets, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]    
Total $ 15,916 $ 14,479
Tradenames
   
Finite Lived Intangible Assets [Line Items]    
Total 10,714 9,814
Referral relationships
   
Finite Lived Intangible Assets [Line Items]    
Total 4,343 3,959
Non-competition agreements
   
Finite Lived Intangible Assets [Line Items]    
Total $ 859 $ 706