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Business Acquisitions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Company
Mar. 31, 2013
Business Acquisition [Line Items]    
Number of physician group practices acquired 3  
Business acquisition, total cash consideration $ 69.4  
Goodwill recorded in connection with acquisitions 63.8  
Other intangible assets 5.8  
Other liabilities 0.2  
Goodwill deductible for tax purposes 50.3  
Contingent consideration payments related to prior-period acquisitions   1.7
Prior-period acquisition [Member]
    
Business Acquisition [Line Items]    
Contingent consideration payments related to prior-period acquisitions 3.4  
Prior-period acquisition of other assets   $ 0.5