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v3.20.4

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

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