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Business Acquisitions, Joint Ventures and Goodwill - Additional Information (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Company
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]    
Number of physician group practices acquired | Company 4  
Number of neonatology practices acquired | Company 1  
Number of other pediatric subspecialty practices acquired | Company 2  
Number of radiology practices acquired | Company 1  
Total business acquisition consideration $ 20,800  
Goodwill 4,301,508 $ 4,283,963
Contingent consideration payments related to prior-period acquisitions 400  
Purchase consideration payments related to prior-period acquisitions 1,200  
Assets held for sale $ 46,000  
Sale of equity method investments 49.00%  
Management Services Reporting Unit [Member]    
Business Acquisition [Line Items]    
Goodwill $ 321,600  
Physician Group [Member]    
Business Acquisition [Line Items]    
Goodwill 14,100  
Other intangible assets 6,700  
Prior-Period Acquisitions [Member]    
Business Acquisition [Line Items]    
Decrease in current assets 700  
Decrease in noncurrent assets 1,400  
Decrease in current liabilities 100  
Increase in noncurrent liabilities 1,400  
Net increase in goodwill resulting from finalization of tax acquisition accounting 3,400  
Goodwill deductible for tax purposes $ 17,000