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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2025
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, 2025 and 2024 is as follows (RSUs in thousands):
20252024
RSUsWeighted Average
Grant Date Fair Value
(Per Unit)		RSUsWeighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 12,024 $173.322,548 $104.76
Granted575 $287.04812 $241.38
Vested(692)$156.28(1,107)$82.61
Forfeited(91)$228.22(126)$158.16
Unvested at September 30
1,816 $213.152,127 $165.61
A summary of the activity for PSUs to be settled in common stock for the nine months ended September 30, 2025 and 2024 is as follows (PSUs in thousands):
20252024
PSUsWeighted Average
Grant Date Fair Value
(Per Unit)		PSUsWeighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 1425 $177.69491 $129.70
Granted92 $259.17109 $263.34
Vested(165)$123.88(175)$96.45
Forfeited(4)$222.94— N/A
Unvested at September 30
348 $224.12425 $177.69
Grant Date Fair Value for Awards of Performance Units Inputs The Monte Carlo simulation valuation methodology applied the following key inputs:
20252024
Valuation date price based on February 27, 2025 and March 4, 2024 closing stock prices of Quanta common stock
$259.26$243.34
Expected volatility (1)
34 %33 %
Risk-free interest rate4.05 %4.43 %
Term in years2.842.83
(1)    The expected volatility inputs for Quanta are based on historical volatility, which is based on Quanta’s dividend-adjusted closing prices over a period equivalent to the performance period.