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Business Acquisitions - Summary of Company's Preliminary Purchase Allocation Price (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Goodwill $ 3,163,866 $ 2,776,188
Radiology Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 65,238  
Property and equipment 11,398  
Other noncurrent assets 8,237  
Goodwill 314,073  
Other intangible assets 199,960  
Current liabilities (27,558)  
Deferred income tax liabilities - long-term (28,865)  
Other long-term liabilities (34,275)  
Total assets and liabilities 508,208  
Other Acquisition [Member]    
Business Acquisition [Line Items]    
Property and equipment 42  
Goodwill 69,756  
Other intangible assets 28,033  
Deferred income tax liabilities - long-term (10,078)  
Total assets and liabilities 87,753  
Radiology Physician Services and Telemedicine Company [Member]    
Business Acquisition [Line Items]    
Current assets 65,238  
Property and equipment 11,440  
Other noncurrent assets 8,237  
Goodwill 383,829  
Other intangible assets 227,993  
Current liabilities (27,558)  
Deferred income tax liabilities - long-term (38,943)  
Other long-term liabilities (34,275)  
Total assets and liabilities $ 595,961