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Goodwill and Intangible Assets - Schedule of changes in goodwill (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Opening balance $ 1,695,688 $ 1,574,466
Goodwill relating to acquisitions consummated during the period 0 123,595
Impact of measurement period adjustments (108) (5,653)
Effect of exchange rate fluctuations (9,896) 3,280
Closing balance $ 1,685,684 $ 1,695,688