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Business Acquisitions - Summary of Company's Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Goodwill $ 3,845,157 $ 3,366,150
Third-Party Receivables Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 17,819  
Property and equipment 5,807  
Other noncurrent assets 115  
Goodwill 190,977  
Other intangible assets 221,870  
Current liabilities (5,863)  
Deferred income tax liabilities - long-term (31,114)  
Other long-term liabilities (829)  
Total assets and liabilities 398,782  
Other Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 200  
Property and equipment 866  
Other noncurrent assets 689  
Goodwill 299,005  
Other intangible assets 82,756  
Current liabilities (333)  
Deferred income tax liabilities - long-term (22,388)  
Total assets and liabilities 360,795  
Third-Party Receivable And Other Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 18,019  
Property and equipment 6,673  
Other noncurrent assets 804  
Goodwill 489,982  
Other intangible assets 304,626  
Current liabilities (6,196)  
Deferred income tax liabilities - long-term (53,502)  
Other long-term liabilities (829)  
Total assets and liabilities $ 759,577