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Business Acquisitions - Summary of Company's Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Goodwill $ 3,946,103 $ 3,845,157
Physician Group [Member]    
Business Acquisition [Line Items]    
Current assets 5,469  
Property and equipment 1,635  
Other noncurrent assets 1,295  
Goodwill 101,962  
Other intangible assets 9,401  
Current liabilities (167)  
Deferred income tax liabilities - long-term (4,011)  
Other long-term liabilities (2,663)  
Total assets and liabilities $ 112,921