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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of RSUs and PSUs to be Settled in Common Stock Activity
A summary of the activity for RSUs to be settled in common stock for the nine months ended September 30, 2024 and 2023 is as follows (RSUs in thousands):
20242023
RSUsWeighted Average
Grant Date Fair Value
(Per Unit)		RSUsWeighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 12,548 $104.763,263 $78.74
Granted812 $241.38667 $161.42
Vested(1,107)$82.61(1,199)$66.14
Forfeited(126)$158.16(119)$114.47
Unvested at September 30
2,127 $165.612,612 $104.39
A summary of the activity for PSUs to be settled in common stock for the nine months ended September 30, 2024 and 2023 is as follows (PSUs in thousands):
20242023
PSUsWeighted Average
Grant Date Fair Value
(Per Unit)		PSUsWeighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 1491 $129.70733 $65.39
Granted109 $263.34177 $174.50
Vested(175)$96.45(413)$35.12
Forfeited— 
N/A
(6)$101.66
Unvested at September 30
425 $177.69491 $129.70
Grant Date Fair Value for Awards of Performance Units Inputs The Monte Carlo simulation valuation methodology applied the following key inputs:
20242023
Valuation date price based on March 4, 2024 and March 9, 2023 closing stock prices of Quanta common stock$243.34$160.55
Expected volatility33 %35 %
Risk-free interest rate4.43 %4.62 %
Term in years2.832.81