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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

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