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Assets Acquired and Liabilities Assumed and Recognized at Acquisition Dates at Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 9,407,317 $ 9,294,479 $ 9,415,295
The Everett Clinic Medical Group (TEC)      
Business Acquisition [Line Items]      
Current assets, net of cash acquired 91,591    
Property and equipment 108,533    
Covenant not-to-compete 3,200    
Amortizable intangible and other long-term assets 30,850    
Goodwill 244,502    
Liabilities assumed (50,940)    
Long-term deferred income taxes (16,880)    
Noncontrolling interests (9,885)    
Aggregate purchase price $ 400,971