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Goodwill (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Nine Months EndedYear Ended
September 30, 2021December 31, 2020
(in thousands)
Opening balance$936,257 $883,170 
Current period acquisitions (Note 7)8,013,878 27,191 
Prior period acquisitions— 123 
Foreign exchange movement(14,923)25,773 
Closing balance$8,935,212 $936,257