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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Summary 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 years ended December 31, 2024, 2023 and 2022 is as follows (RSUs in thousands):
202420232022
RSUsWeighted Average
Grant Date Fair Value
(Per Unit)		RSUsWeighted Average
Grant Date Fair Value
(Per Unit)		RSUsWeighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 12,548 $104.763,263 $78.743,880 $61.64
Granted857 $246.34684 $161.81860 $113.07
Vested(1,216)$82.86(1,268)$68.06(1,319)$50.60
Forfeited(165)$165.14(131)$116.29(158)$84.94
Unvested at December 312,024 $173.322,548 $104.763,263 $78.74
A summary of the activity for PSUs to be settled in common stock for the years ended December 31, 2024, 2023 and 2022 is as follows (PSUs in thousands):
202420232022
PSUsWeighted Average
Grant Date Fair Value
(Per Unit)		PSUsWeighted Average
Grant Date Fair Value
(Per Unit)		PSUs
Weighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 1491 $129.70733 $65.39931 $47.27
Granted109 $263.34177 $174.50153 $119.74
Vested(175)$96.45(413)$35.12(334)$40.15
Forfeited— 
N/A
(6)$101.66(17)$58.79
Unvested at December 31425 $177.69491 $129.70733 $65.39
Grant Date Fair Value for Awards of Performance Units Inputs
The Monte Carlo simulation valuation methodology applied the following key inputs:
202420232022
Valuation date price based on March 4, 2024, March 9, 2023 and March 2, 2022 closing stock prices of Quanta common stock$243.34$160.55$110.24
Expected volatility (1)
33 %35 %39 %
Risk-free interest rate4.43 %4.62 %1.64 %
Term in years2.832.812.83
(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.