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Employee Benefits - Components of Net Periodic Benefit Cost (Details) - United Kingdom - 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]      
Service cost $ 42 $ 117 $ 134
Interest cost 975 672 665
Expected return on plan assets (1,015) (1,258) (1,171)
Amortization of net (gain)/loss (274) 228 625
Net periodic benefit (credit)/cost $ (272) $ (241) $ 253