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Segments - Summary of Geographic Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenue $ 5,381,384 $ 5,714,073 $ 11,270,552 $ 10,849,583
United States [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenue 3,089,794 3,372,201 6,470,357 6,408,907
United Kingdom [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenue 677,880 657,005 1,451,895 1,245,587
All other countries [Member]        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenue $ 1,613,710 $ 1,684,867 $ 3,348,300 $ 3,195,089