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Share-based awards (Tables)
 6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
The following table summarizes option activity for the six months ended June 30, 2022:
 Options
Outstanding
Number of Shares 		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life
Outstanding at December 31, 20211,695,460 $104.79 5.39
Granted108,643 $229.94 
Exercised(159,761)$94.70 
Canceled/expired(36,531)$124.62 
Outstanding at June 30, 20221,607,811 $119.68 5.27
Exercisable at June 30, 20221,044,178 $99.21 4.49
Schedule of Weighted Average Fair Values and Assumptions Used The weighted average grant date fair values and assumptions used were as follows:
Six Months Ended
June 30, 2022June 30, 2021
Weighted average grant date fair value$68.40 $49.15 
Assumptions:  
Expected volatility31 %30 %
Dividend yield— %— %
Risk-free interest rate1.85 %0.78 %
Expected life5 years5 years
Summary of RSU and PSU Activity The following table summarizes RSU and PSU activity for the six months ended June 30, 2022:
  
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, 2021154,190 $160.23 572,785 $191.20 
Granted64,682 $214.25 291,043 $217.51 
Shares vested(45,567)$140.18 (187,126)$173.20 
Forfeited(2,718)$157.30 (43,175)$201.02 
Outstanding at June 30, 2022170,587 $189.05 633,527 $207.98 
Schedule of Non-cash Stock Compensation Expense
Non-cash stock compensation expense for the six months ended June 30, 2022 and June 30, 2021 has been allocated as follows:
Three Months EndedSix Months Ended
June 30, 2022June 30, 2021June 30, 2022June 30, 2021
(in thousands)(in thousands)
Direct costs$5,833 $3,101 $10,832 $5,156 
Selling, general and administrative13,450 5,379 27,354 9,718 
 $19,283 $8,480 $38,186 $14,874