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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues:        
Total revenues $ 512,450 $ 519,088 $ 1,080,026 $ 1,122,255
U.K.        
Revenues:        
Total revenues 216,228 222,726 452,792 465,096
U.S.        
Revenues:        
Total revenues 129,880 135,911 273,319 289,355
Asia        
Revenues:        
Total revenues 75,283 74,596 158,367 164,188
Other Europe/MEA        
Revenues:        
Total revenues 50,820 46,508 108,771 113,145
France        
Revenues:        
Total revenues 24,325 25,968 55,280 60,221
Other Americas        
Revenues:        
Total revenues $ 15,914 $ 13,379 $ 31,497 $ 30,250