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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022, 2021 and 2020 is as follows (RSUs in thousands):
202220212020
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 13,880 $61.643,869 $37.573,265 $35.34
Granted860 $113.071,642 $94.832,029 $39.91
Vested(1,319)$50.60(1,476)$37.03(1,269)$35.69
Forfeited(158)$84.94(155)$48.52(156)$36.67
Unvested at December 313,263 $78.743,880 $61.643,869 $37.57
A summary of the activity for PSUs to be settled in common stock for the years ended December 31, 2022, 2021 and 2020 is as follows (PSUs in thousands):
202220212020
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) (1)
Unvested at January 1931 $47.271,047 $37.65848 $40.04
Granted153 $119.74174 $90.44437 $34.60
Vested(334)$40.15(268)$38.28(238)$41.87
Forfeited(17)$58.79(22)$41.86— N/A
Unvested at December 31733 $65.39931 $47.271,047 $37.65
(1) Certain weighted average grant date fair value per unit amounts related to the year ended December 31, 2020 were recast in the year ended December 31, 2021 to conform to the correction of the valuation of PSUs described below.
Grant Date Fair Value for Awards of Performance Units Inputs
The Monte Carlo simulation valuation methodology applied the following key inputs:
202220212020
Valuation date price based on March 2, 2022, March 25, 2021 and March 26, 2020 closing stock prices of Quanta common stock$110.24$83.48$31.49
Expected volatility39 %36 %34 %
Risk-free interest rate1.64 %0.26 %0.35 %
Term in years2.832.772.76