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Intangible Assets, Net - Amortization Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses $ 893 $ 838 $ 695
Referral relationships [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses 521 433 305
Non competition agreements [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expenses $ 372 $ 405 $ 390