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Business Acquisitions - Additional Information (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
Company
Jun. 01, 2014
JointVenture
Business Combinations [Abstract]    
Number of physician group practices acquired 6  
Business acquisition, total consideration $ 138,600,000  
Cash consideration 135,500,000  
Business acquisition, other liabilities 2,400,000  
Contingent consideration 700,000  
Goodwill recorded in connection with acquisitions 129,700,000  
Other intangible assets 8,800,000  
Other liabilities 1,100,000  
Other assets 1,200,000  
Goodwill deductible for tax purposes 94,900,000  
Business acquisition contingent consideration recorded as equity 700,000  
Business acquisition contingent consideration recorded as liability 41,000  
Time period for achievement of certain performance measures for payment of contingent consideration, years 4 years  
Contingent consideration payments related to prior-period acquisitions 10,700,000  
Number of joint ventures   2
Fair value, contribution credit 7,700,000  
Carrying value of goodwill transferred 7,200,000  
Fixed assets transferred 500,000  
Gain or loss from the joint venture transaction $ 0  
Joint venture ownership 1, economic interest 75.00%  
Joint venture ownership 2, economic interest 37.50%