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Intangible Assets, Net - Amortization Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses $ 242 $ 256
Referral relationships
    
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses 155 150
Non-competition agreements
    
Finite Lived Intangible Assets [Line Items]    
Total amortization expenses $ 87 $ 106