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Segment, Geographic and Product Information - Geographic Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues:    
Total revenues $ 567,576 $ 603,167
U.K. [Member]    
Revenues:    
Total revenues 236,564 242,370
U.S. [Member]    
Revenues:    
Total revenues 143,439 153,444
Asia [Member]    
Revenues:    
Total revenues 83,084 89,592
Other Europe/MEA [Member]    
Revenues:    
Total revenues 57,951 66,637
France [Member]    
Revenues:    
Total revenues 30,955 34,253
Other Americas [Member]    
Revenues:    
Total revenues $ 15,583 $ 16,871