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Equity Incentive Schemes and Stock Compensation Charges (Tables)

12 Months Ended

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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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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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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