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Goodwill
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
Nine Months EndedYear Ended
September 30, 2023December 31, 2022
(in thousands)
Opening balance$8,971,670 $9,037,931 
Current period acquisition13,379 — 
Prior period acquisition— (35,692)
Foreign exchange movement(2,153)(30,569)
Closing balance$8,982,896 $8,971,670 
On April 20, 2023, the Company completed the purchase of the majority investor's 51% majority voting share capital of Oncacare Limited ("Oncacare"), such that Oncacare and its subsidiaries became wholly-owned subsidiaries of the ICON Group. The Oncacare acquisition resulted in goodwill of $13.4 million and also gave rise to an acquisition-related gain of $6.2 million.
There were no impairment charges for the nine months ended September 30, 2023 or for the year ended December 31, 2022.