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Intangible Assets, Net - Additional Information (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]      
Accumulated amortization $ 893 $ 838 $ 695
Referral relationships [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization 521 433 305
Referral relationships [Member] | Minimum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 6 years    
Referral relationships [Member] | Maximum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 16 years    
Non competition agreements [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization $ 372 $ 405 $ 390
Non competition agreements [Member] | Minimum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 5 years    
Non competition agreements [Member] | Maximum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 6 years