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Equity Incentive Schemes and Stock Compensation Charges (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of Transactions for Company's Share Option Plans | The following table summarizes the transactions for the Company's share option plans for the years ended December 31, 2024, December 31, 2023 and December 31, 2022:
| Options Granted Under Plans | Weighted Average Exercise Price
Outstanding at December 31, 2021 | 1,695,460 |  | $ | 110.38 |
Granted | 108,643 |  | $ | 229.94 |
Exercised | (348,286) |  | $ | 102.87 |
Forfeited/expired | (77,698) |  | $ | 143.08 |
Outstanding at December 31, 2022 | 1,378,119 |  | $ | 119.86 |
Granted | 82,472 |  | $ | 232.48 |
Exercised | (535,705) |  | $ | 95.12 |
Forfeited/expired | (22,080) |  | $ | 196.20 |
Outstanding at December 31, 2023 | 902,806 |  | $ | 142.96 |
Granted | 68,380 |  | $ | 325.51 |
Exercised | (311,040) |  | $ | 116.31 |
Forfeited/expired | (37,854) |  | $ | 238.51 |
Outstanding at December 31, 2024 | 622,292 |  | $ | 170.52 |
Vested and exercisable at December 31, 2024 | 426,497 |  | $ | 135.39 |
Summary of Weighted Average Fair Values and Assumptions Used | The weighted average fair values and assumptions were as follows:
| Year Ended
| December 31, 2024 | December 31, 2023 | December 31, 2022
Weighted average fair value | $ | 115.76 |  | $ | 85.12 |  | $ | 68.42 |
Assumptions: |  |  |
Expected volatility | 36 | % | 33 | % | 31 | %
Dividend yield | — | % | — | % | — | %
Risk-free interest rate | 4.20 | % | 4.18 | % | 1.86 | %
Expected life | 4.3 years | 5.0 years | 5.0 years
Summary of RSU and PSU Activity | The following table summarizes RSU and PSU activity for the year ended December 31, 2024:
| PSU Outstanding Number of Shares | PSU Weighted Average Grant Date Fair Value |  | RSU Outstanding Number of Shares | RSU Weighted Average Grant Date Fair Value |
Outstanding at December 31, 2023 | 105,256 |  | $ | 226.29 |  |  | 621,011 |  | $ | 218.27 |  |
Granted | 48,626 |  | $ | 325.51 |  |  | 258,345 |  | $ | 313.41 |  |
Shares vested | (9,975) |  | $ | 177.38 |  |  | (120,458) |  | $ | 223.29 |  |
Forfeited | (124,186) |  | $ | 260.42 |  |  | (111,309) |  | $ | 241.13 |  |
Outstanding at December 31, 2024 | 19,721 |  | $ | 280.76 |  |  | 647,589 |  | $ | 251.36 |  |
Schedule of Non-cash Stock Compensation Expense | Stock compensation expense has been allocated as follows:
| Year ended
| December 31, 2024 | December 31, 2023 | December 31, 2022
| (in thousands)
Direct costs | $ | 26,046 |  | $ | 26,595 |  | $ | 22,854 |
Selling, general and administrative | 19,824 |  | 29,072 |  | 47,669 |
Total | $ | 45,870 |  | $ | 55,667 |  | $ | 70,523 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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