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Segment, Geographic and Product Information - Geographic Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues:        
Total revenues $ 519,088 $ 551,187 $ 1,122,255 $ 1,095,938
U.S. [Member]        
Revenues:        
Total revenues 135,911 145,571 289,355 291,991
U.K. [Member]        
Revenues:        
Total revenues 222,726 222,473 465,096 454,253
Asia [Member]        
Revenues:        
Total revenues 74,596 92,297 164,188 173,864
Other Europe/MEA [Member]        
Revenues:        
Total revenues 46,508 54,349 113,145 104,192
France [Member]        
Revenues:        
Total revenues 25,968 21,130 60,221 42,619
Other Americas [Member]        
Revenues:        
Total revenues $ 13,379 $ 15,367 $ 30,250 $ 29,019