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Equity Incentive Schemes and Stock Compensation Charges - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended | 24 Months Ended | 252 Months Ended |  |  |  |  |
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Feb. 14, 2017 | May 11, 2015 | Jan. 17, 2003 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2017 | May 18, 2020 | May 16, 2019 | May 31, 2018 | Feb. 13, 2017 | Sep. 23, 2013
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average contractual term of options outstanding |  |  |  | 5 years 4 months 20 days | 4 years 10 months 9 days |  |  |  |  |  |  |  |
Exercisable - weighted average remaining contractual life |  |  |  | 4 years 6 months 18 days | 3 years 7 months 6 days |  |  |  |  |  |  |  |
Total compensation costs |  |  |  | $ 133,844 | $ 26,271 | $ 26,819 |  |  |  |  |  |  |
Income tax benefit related to stock compensation |  |  |  | 22,700 | 6,900 | 8,200 |  |  |  |  |  |  |
Cash tax benefit related to stock options exercised |  |  |  | $ 23,900 | 2,500 | $ 1,900 |  |  |  |  |  |  |
The 2020 Legacy PRA Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance (in shares) |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |
The 2018 Legacy PRA Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
2013 Legacy PRA Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 2,052,909
Percentage of outstanding shares authorized |  |  |  |  |  |  |  |  |  |  |  |  | 12.50%
Consultants Stock Plan, 2008 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance (in shares) | 1,000,000 |  |  |  |  |  |  |  |  |  |  | 400,000 |
Limit of shares issued or to be issued pursuant to options granted (in shares) | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Plan, 2008 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance (in shares) | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares per employee (in shares) | 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Option Plans 2008 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of option price for fair value of ordinary share (in percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Employee Stock Plan, 2003 Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance (in shares) |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |
Maximum number of shares per employee (in shares) |  |  | 400,000 |  |  |  |  |  |  |  |  |  |
Maximum number of award as percentage of shares outstanding (in percent) |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
Employee Stock Option | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Employee Stock Option | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  | 8 years |  |  |  |  |  |  |  |  |
Employee Stock Option | Award date, prior to 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Shares expiration period |  |  |  |  |  |  |  | 8 years |  |  |  |  |
Employee Stock Option | Award date, 2018 and thereafter |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  |  |  | 12 months |  |  |  |  |  |  |
Shares expiration period |  |  |  |  |  | 8 years |  |  |  |  |  |  |
Restricted Stock Units 2013 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance (in shares) |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |
Additional number of ordinary shares which have been reserved for issuance (in shares) |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |
Consultants Restricted Stock Units 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares which have been reserved for issuance (in shares) |  |  |  |  |  |  |  |  |  | 250,000 |  |  |
Consultants Restricted Stock Units 2019 | Non-executive director |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  |  |  |  | 12 months |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of stock units vested |  |  |  | $ 83,500 | $ 14,300 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price of equity instruments other than options, vested in period (in USD per share) |  |  |  | $ 115.11 | $ 83.47 |  | $ 83.47 |  |  |  |  |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price of equity instruments other than options, vested in period (in USD per share) |  |  |  | $ 206.71 | $ 156.21 |  | 156.21 |  |  |  |  |  |
Performance Share Unit (PSUs) |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of stock units vested |  |  |  | $ 5,100 | $ 5,300 |  |  |  |  |  |  |  |
Performance Share Unit (PSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price of equity instruments other than options, vested in period (in USD per share) |  |  |  | $ 115.11 | $ 83.47 |  | 83.47 |  |  |  |  |  |
Performance Share Unit (PSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price of equity instruments other than options, vested in period (in USD per share) |  |  |  | $ 125.74 | $ 90.03 |  | $ 90.03 |  |  |  |  |  |
PSUs Based on Service and EPS Targets | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock units to be granted (in shares) |  |  |  | 71,890 |  |  |  |  |  |  |  |  |

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