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Employee Benefits - Net Periodic Pension Benefit Cost Assumptions (Details) - ICON Development Solutions Limited pension plan - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets 3.80% 3.80%  
United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.90% 1.80% 1.50%
Rate of compensation increase 3.60% 3.70% 3.40%
Expected rate of return on plan assets 3.80% 3.80% 3.40%
Other comprehensive income/(loss)        
Actuarial gain - benefit obligation $ (335) $ (18,636) $ (2,097)
Actuarial loss/(gain) - plan assets 910 7,305 (1,176)
Amortization of net gain/(loss) recognized in net periodic benefit (credit)/cost 274 (228) (625)
 Total $ 849 $ (11,559) $ (3,898)