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Share-based awards (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
The following table summarizes option activity for the three months ended March 31, 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
Granted96,525 $231.68 
Exercised(84,090)$190.75 
Canceled/expired(25,660)$113.04 
Outstanding at March 31, 20221,682,235 $118.36 5.44
Exercisable at March 31, 20221,054,178 $97.57 4.55
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, 2022March 31, 2021
Weighted average grant date fair value$68.24 $48.36 
Assumptions:  
Expected volatility30 %30 %
Dividend yield— %— %
Risk-free interest rate1.74 %0.73 %
Expected life5 years5 years
Summary of RSU and PSU Activity The following table summarizes RSU and PSU activity for the three months ended March 31, 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 
Granted51,949 $231.68 26,000 $231.68 
Shares vested(42,409)$140.38 (32,360)$166.85 
Forfeited(285)$140.18 (24,599)$200.16 
Outstanding at March 31, 2022163,445 $186.77 541,826 $194.19 
Schedule of Non-cash Stock Compensation Expense
Non-cash stock compensation expense for the three months ended March 31, 2022 and March 31, 2021 has been allocated as follows:
Three Months Ended
March 31, 2022March 31, 2021
(in thousands)
Direct costs$4,999 $2,055 
Selling, general and administrative13,904 4,339 
 $18,903 $6,394