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Business Acquisitions - Summary of Company's Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Goodwill $ 3,366,150 $ 2,776,188
Radiology Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 51,736  
Property and equipment 11,398  
Other noncurrent assets 8,237  
Goodwill 313,340  
Other intangible assets 199,960  
Current liabilities (27,008)  
Deferred income tax liabilities-long-term (15,850)  
Other long-term liabilities (34,275)  
Total assets and liabilities 507,538  
Other Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 11,445  
Property and equipment 449  
Other noncurrent assets 2,552  
Goodwill 275,984  
Other intangible assets 73,477  
Current liabilities (1,160)  
Deferred income tax liabilities-long-term (14,356)  
Other long-term liabilities (2,618)  
Total assets and liabilities 345,773  
Radiology Physician Services and Telemedicine Company [Member]    
Business Acquisition [Line Items]    
Current assets 63,181  
Property and equipment 11,847  
Other noncurrent assets 10,789  
Goodwill 589,324  
Other intangible assets 273,437  
Current liabilities (28,168)  
Deferred income tax liabilities-long-term (30,206)  
Other long-term liabilities (36,893)  
Total assets and liabilities $ 853,311