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Intangible Assets, Net - Additional Information (Detail)
3 Months Ended
Mar. 31, 2014
Referral relationships | Minimum
 
Finite Lived Intangible Assets [Line Items]  
Estimated useful life 6 years
Referral relationships | Maximum
 
Finite Lived Intangible Assets [Line Items]  
Estimated useful life 16 years
Non-competition agreements | Minimum
 
Finite Lived Intangible Assets [Line Items]  
Estimated useful life 5 years
Non-competition agreements | Maximum
 
Finite Lived Intangible Assets [Line Items]  
Estimated useful life 6 years