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Share-based awards (Tables)

3 Months Ended

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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Summary Of Share Based Compensation Restricted Stock Units Performance Stock Units Award Activity [Table Text Block]

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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.

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-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

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-Name Accounting Standards Codification
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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.

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