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Business Acquisitions - Summary of Company's Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Goodwill $ 4,283,963 $ 3,845,157
Physician Group [Member]    
Business Acquisition [Line Items]    
Current assets 43,550  
Property and equipment 5,281  
Other noncurrent assets 52,611  
Goodwill 439,822  
Other intangible assets 39,414  
Current liabilities (5,674)  
Other long-term liabilities (21,086)  
Total assets and liabilities $ 553,918