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Share-based awards (Tables) | 3 Months Ended
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Mar. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following table summarizes option activity for the three months ended March 31, 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 | (40,883) |  |  | $ | 116.46 |  |  |
Forfeited/Expired | (762) |  |  | $ | 216.10 |  |  |
Outstanding at March 31, 2025 | 699,549 |  |  | $ | 176.12 |  |  | 4.54
Exercisable at March 31, 2025 | 450,752 |  |  | $ | 150.36 |  |  | 3.28
Schedule of Weighted Average Fair Values and Assumptions Used | The weighted average grant date fair values and assumptions used were as follows:
| Three Months Ended
| March 31, 2025 |  | March 31, 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
Summary of RSU and PSU Activity | The following table summarizes RSU and PSU activity for the three months ended March 31, 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 |  |  | 48,964 |  |  | $ | 185.06 |
Shares vested | (8,191) |  |  | $ | 231.68 |  |  | (18,855) |  |  | $ | 263.34 |
Forfeited | — |  |  | $ | — |  |  | (18,176) |  |  | $ | 247.29 |
Outstanding at March 31, 2025 | 52,889 |  |  | $ | 213.62 |  |  | 659,522 |  |  | $ | 246.21 |
Schedule of Non-Cash Stock Compensation Expense | Stock compensation expense for the three months ended March 31, 2025 and March 31, 2024 has been allocated as follows:
| Three Months Ended |  |
| March 31, 2025 | March 31, 2024 |  |  |
| (in thousands)
Direct costs | $ | 5,381 |  | $ | 6,721 |  |  |  |
Selling, general and administrative | 6,913 |  | 6,460 |  |  |  |
Total | $ | 12,294 |  | $ | 13,181 |  |  |  |

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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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