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Goodwill and Intangible Assets - Changes in Goodwill (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
Opening balance $ 1,574,466 $ 1,393,832
Goodwill relating to acquisitions consummated during the period   185,381
Impact of measurement period adjustments   (988)
Effect of exchange rate fluctuations (19,787) (3,759)
Closing balance $ 1,554,679 $ 1,574,466