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Employee Benefits - Funded Status (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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United Kingdom | ICON Development Solutions Limited pension plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected benefit obligation | $ (41,813) |  | $ (43,988) |
Fair value of plan assets | 36,198 |  | 34,612 | $ 32,016
Funded status | (5,615) |  | (9,376) |
Non-current other liabilities (note 9) | (5,615) |  | (9,376) |
United Kingdom | PRA Switzerland AG pension plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 3,017 | $ 2,849 |  |
Switzerland | Aptiv Solutions pension plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected benefit obligation | (7,643) |  | (8,620) |
Fair value of plan assets | 6,964 |  | 7,601 | $ 6,014
Funded status | (679) |  | (1,019) |
Non-current other liabilities (note 9) | (679) |  | $ (1,019) |
Switzerland | PRA Switzerland AG pension plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Projected benefit obligation | (4,990) |  |  |
Fair value of plan assets | 3,017 |  |  |
Funded status | (1,973) |  |  |
Non-current other liabilities (note 9) | $ (1,973) |  |  |

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