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Segments - Summary of Geographic Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenue | $ 5,645,142 | $ 5,925,101 | $ 16,915,694 | $ 16,774,684
United States [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenue | 3,162,235 | 3,442,570 | 9,632,592 | 9,851,477
United Kingdom [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenue | 736,927 | 758,084 | 2,188,822 | 2,003,671
All other countries [Member] |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |
Revenue | $ 1,745,980 | $ 1,724,447 | $ 5,094,280 | $ 4,919,536

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