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Business Acquisitions (Narrative) (Detail) (USD $)
9 Months Ended 9 Months Ended
Sep. 30, 2012
Y
Company
Sep. 30, 2012
Prior-Period Acquisitions [Member]
Dec. 31, 2011
Prior-Period Acquisitions [Member]
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Maximum [Member]
Business Acquisition [Line Items]          
Number of physician group practices acquired 10        
Business acquisition, total consideration $ 205,700,000        
Cash consideration 197,900,000        
Contingent consideration 7,800,000        
Goodwill recorded in connection with acquisitions 189,800,000 193,000,000      
Other intangible assets 17,900,000        
Fixed assets 500,000        
Other liabilities 2,500,000        
Time period for achievement of certain performance measures for payment of contingent consideration, years 5        
Assumed discount rates for acquisition-date fair value       3.00% 5.00%
Assumed payment probability of contingent consideration payment 100.00%        
Range of the undiscounted amount under contingent consideration agreement, low 0        
Range of the undiscounted amount under contingent consideration agreement, high 8,500,000        
Contingent consideration payments accrual related to prior-period acquisitions   9,400,000 6,200,000    
Goodwill deductible for tax purpose   $ 51,600,000