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Segment, Geographic and Product Information - Geographic Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:                      
Total revenues $ 479,426 $ 455,039 $ 519,088 $ 603,167 $ 487,156 $ 521,137 $ 551,187 $ 544,751 $ 2,056,720 $ 2,104,231 $ 1,937,810
U.K. [Member]                      
Revenues:                      
Total revenues                 867,066 864,955 811,542
U.S. [Member]                      
Revenues:                      
Total revenues                 518,770 564,037 544,887
Asia [Member]                      
Revenues:                      
Total revenues                 311,190 331,328 278,141
France [Member]                      
Revenues:                      
Total revenues                 107,679 83,664 77,992
Other Americas [Member]                      
Revenues:                      
Total revenues                 59,163 58,103 54,687
Other Europe/MEA [Member]                      
Revenues:                      
Total revenues                 $ 192,852 $ 202,144 $ 170,561