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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets 3.80%    
United Kingdom      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 1.50% 2.10% 2.90%
Rate of compensation increase 3.40% 3.30% 3.70%
Expected rate of return on plan assets 3.40% 4.00% 2.10%
Other comprehensive income        
Actuarial (gain)/loss - benefit obligation $ (2,097) $ 5,294 $ 4,756
Actuarial gain – plan assets (1,176) (878) (2,930)
Actuarial loss recognized in net periodic benefit cost (625) (160) (67)
 Total $ (3,898) $ 4,256 $ 1,759