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Intangible Assets, Net - Amortization Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Finite Lived Intangible Assets Amortization [Line Items]        
Total amortization expenses $ 201 $ 212 $ 457 $ 381
Referral relationships [Member]
        
Finite Lived Intangible Assets Amortization [Line Items]        
Total amortization expenses 116 100 266 178
Non compete agreements [Member]
        
Finite Lived Intangible Assets Amortization [Line Items]        
Total amortization expenses $ 85 $ 112 $ 191 $ 203