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Business Acquisitions - Summary of Company's Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Goodwill $ 3,828,807 $ 3,366,150
Third Party Receivables Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 18,689  
Property and equipment 5,807  
Other noncurrent assets 115  
Goodwill 201,796  
Other intangible assets 221,870  
Current liabilities (5,863)  
Deferred income tax liabilities - long-term (41,934)  
Other long-term liabilities (829)  
Total assets and liabilities 399,651  
Other Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 200  
Property and equipment 83  
Other noncurrent assets 643  
Goodwill 271,837  
Other intangible assets 68,724  
Current liabilities (333)  
Deferred income tax liabilities - long-term (18,602)  
Total assets and liabilities 322,552  
Third Party Receivables and Other Acquisition [Member]    
Business Acquisition [Line Items]    
Current assets 18,889  
Property and equipment 5,890  
Other noncurrent assets 758  
Goodwill 473,633  
Other intangible assets 290,594  
Current liabilities (6,196)  
Deferred income tax liabilities - long-term (60,536)  
Other long-term liabilities (829)  
Total assets and liabilities $ 722,203