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Segments and Geographic Information - Summary of Revenues and Long-lived Assets by Services Provided in Geographic Region (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues |  |  |
Total revenues | $ 3,155,671 | $ 3,785,063 | $ 3,707,628
Long-Lived Assets |  |  |
Total long-lived assets | 80,016 | 114,690 |
North America [Member] |  |  |
Revenues |  |  |
Total revenues | 2,791,282 | 3,324,019 | 3,257,937
Long-Lived Assets |  |  |
Total long-lived assets | 72,722 | 107,940 |
International [Member] |  |  |
Revenues |  |  |
Total revenues | 363,433 | 461,044 | $ 449,691
Long-Lived Assets |  |  |
Total long-lived assets | $ 7,294 | $ 6,750 |

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