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Business Acquisitions - Additional Information (Detail)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
Acquisition
Company
shares
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]    
Number of physician group practices acquired | Company 9  
Business acquisition, total consideration $ 840,900  
Payments to acquire business, net of cash acquired 805,700  
Contingent consideration $ 3,800  
Number of anesthesiology practices acquired | Company 6  
Number of neonatology practices acquired | Company 2  
Number of other pediatric subspecialty practices acquired | Company 1  
Number of business acquired | Acquisition 11  
Cash acquired from acquisition $ 23,200  
Business acquisition, other current liabilities 400  
Payments to acquire business by issue of common stock $ 7,800  
Number of shares of common stock issued | shares 114,306  
Goodwill deductible for tax purposes $ 39,800  
Time period for achievement of certain performance measures for payment of contingent consideration, years 2 years  
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 4,000  
Contingent consideration decrease in fair value 800  
Contingent consideration payments related to prior-period acquisitions 10,100  
Goodwill 3,347,823 $ 2,776,188
Prior-Period Acquisitions [Member]    
Business Acquisition [Line Items]    
Goodwill 600  
Other intangible assets 5,300  
Other long-term liabilities 2,600  
Additional cash consideration related to a working capital 600  
Other current assets 2,600  
Radiology Physician Services and Telemedicine Company [Member]    
Business Acquisition [Line Items]    
Business acquisition, total consideration 507,400  
Business acquisition, base consideration 500,000  
Business acquisition, other closing consideration 7,400  
Goodwill 570,997  
Other intangible assets 280,251  
Other long-term liabilities $ 36,134  
Minimum [Member]    
Business Acquisition [Line Items]    
Assumed discount rates for acquisition-date fair value 2.80%  
Maximum [Member]    
Business Acquisition [Line Items]    
Assumed discount rates for acquisition-date fair value 3.50%