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Segments - Summary of Geographic Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue $ 3,823,831 $ 3,193,487 $ 3,207,537 $ 2,846,734 $ 3,700,242 $ 2,712,559 $ 2,390,506 $ 2,052,503 $ 13,071,589 $ 10,855,810 $ 9,049,918
Property and equipment, net 560,756       529,823       560,756 529,823  
United States [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 6,917,221 5,991,826 5,027,479
Property and equipment, net 396,608       383,927       396,608 383,927  
United Kingdom [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 2,094,946 1,912,270 1,627,445
Property and equipment, net 61,327       63,548       61,327 63,548  
All other countries [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue                 4,059,422 2,951,714 $ 2,394,994
Property and equipment, net $ 102,821       $ 82,348       $ 102,821 $ 82,348