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Business Acquisitions - Summary of Company's Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Goodwill $ 4,118,234 $ 3,845,157
Physician Group [Member]    
Business Acquisition [Line Items]    
Current assets 65,107  
Property and equipment 4,398  
Other noncurrent assets 13,747  
Goodwill 274,093  
Other intangible assets 25,605  
Current liabilities (4,392)  
Deferred income tax liabilities - long-term (395)  
Other long-term liabilities (21,602)  
Total assets and liabilities $ 356,561