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Segment and Geographic Information - Geographic Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
Total revenues $ 956,646 $ 783,193
United States [Member]    
Revenues:    
Total revenues 572,254 461,686
United Kingdom [Member]    
Revenues:    
Total revenues 223,559 186,810
Asia [Member]    
Revenues:    
Total revenues 69,029 61,109
Other Europe/MEA [Member]    
Revenues:    
Total revenues 53,672 34,002
France [Member]    
Revenues:    
Total revenues 23,018 25,265
Other Americas [Member]    
Revenues:    
Total revenues $ 15,114 $ 14,321