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Business Acquisitions - Summary of Company's Preliminary Purchase Allocation Price (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Goodwill $ 3,347,823 $ 2,776,188
Radiology Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 65,210  
Property and equipment 11,398  
Other noncurrent assets 8,237  
Goodwill 313,311  
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 507,418  
Other Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 11,187  
Property and equipment 407  
Other noncurrent assets 2,543  
Goodwill 257,686  
Other intangible assets 80,291  
Current liabilities (534)  
Deferred income tax liabilities - long-term (16,231)  
Other long-term liabilities (1,859)  
Total assets and liabilities 333,490  
Radiology Physician Services and Telemedicine Company [Member]    
Business Acquisition [Line Items]    
Current assets 76,397  
Property and equipment 11,805  
Other noncurrent assets 10,780  
Goodwill 570,997  
Other intangible assets 280,251  
Current liabilities (28,092)  
Deferred income tax liabilities - long-term (45,096)  
Other long-term liabilities (36,134)  
Total assets and liabilities $ 840,908