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Intangible Assets, Net - Intangible Assets, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Intangible Assets Net Excluding Goodwill [Line Items]    
Total $ 14,029 $ 12,146
Tradenames [Member]
    
Intangible Assets Net Excluding Goodwill [Line Items]    
Total 9,273 7,973
Referral relationships [Member]
    
Intangible Assets Net Excluding Goodwill [Line Items]    
Total 4,035 3,501
Non compete agreements [Member]
    
Intangible Assets Net Excluding Goodwill [Line Items]    
Total $ 721 $ 672