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Share-based awards (Tables) | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | The following table summarizes option activity for the nine months ended September 30, 2025:
| Options Outstanding Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life
Outstanding at December 31, 2024 | 622,292 |  |  | $ | 170.52 |  |  | 3.91
Granted | 118,902 |  |  | $ | 185.18 |  |  |
Exercised | (65,894) |  |  | $ | 111.04 |  |  |
Forfeited/Expired | (15,576) |  |  | $ | 252.40 |  |  |
Outstanding at September 30, 2025 | 659,724 |  |  | $ | 177.17 |  |  | 4.10
Exercisable at September 30, 2025 | 424,978 |  |  | $ | 152.58 |  |  | 2.85
Schedule of Weighted Average Fair Values and Assumptions Used | The weighted average grant date fair values and assumptions used were as follows:
| Nine Months Ended
| September 30, 2025 |  | September 30, 2024
Weighted average grant date fair value | $ | 64.42 |  |  | $ | 115.76 |
Assumptions: |  |  |
Expected volatility | 35 | % |  | 36 | %
Dividend yield | — | % |  | — | %
Risk-free interest rate | 4.00 | % |  | 4.20 | %
Expected life | 4.4 years |  | 4.3 years
Schedule of RSU and PSU Activity | The following table summarizes RSU and PSU activity for the nine months ended September 30, 2025:
| 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, 2024 | 19,721 |  |  | $ | 280.76 |  |  | 647,589 |  |  | $ | 251.36 |
Granted | 41,359 |  |  | $ | 185.18 |  |  | 1,160,760 |  |  | $ | 130.85 |
Shares vested | (8,191) |  |  | $ | 231.68 |  |  | (33,317) |  |  | $ | 273.99 |
Forfeited | (31,255) |  |  | $ | 232.28 |  |  | (125,578) |  |  | $ | 216.40 |
Outstanding at September 30, 2025 | 21,634 |  |  | $ | 186.66 |  |  | 1,649,454 |  |  | $ | 168.76 |
Schedule of Non-Cash Stock Compensation Expense | Stock compensation expense for the three and nine months ended September 30, 2025 and September 30, 2024 has been allocated as follows:
| Three Months Ended |  | Nine Months Ended
| September 30, 2025 | September 30, 2024 |  | September 30, 2025 | September 30, 2024
| (in thousands)
Direct costs | $ | 21,479 |  | $ | 7,745 |  |  | $ | 36,150 |  | $ | 21,765 |
Selling, general and administrative | 24,712 |  | 5,293 |  |  | 37,768 |  | 19,418 |
Total | $ | 46,191 |  | $ | 13,038 |  |  | $ | 73,918 |  | $ | 41,183 |

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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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