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Segments - Summary of Geographic Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenue $ 5,260,954 $ 4,638,596 $ 15,046,340 $ 13,129,133
United States [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenue 3,063,616 2,699,197 8,646,018 7,816,048
United Kingdom [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenue 638,018 561,356 1,852,799 1,552,499
All other countries [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenue $ 1,559,320 $ 1,378,043 $ 4,547,523 $ 3,760,586