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Intangible Assets, Net - Intangible Assets, Net (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Referral relationships [Member]
   
Intangible Assets Net Excluding Goodwill [Line Items]    
Accumulated amortization $ 1,460 $ 1,217
Non competition agreements [Member]
   
Intangible Assets Net Excluding Goodwill [Line Items]    
Accumulated amortization $ 1,872 $ 1,848