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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2026
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 three months ended March 31, 2026 and 2025 is as follows (RSUs in thousands):
20262025
RSUsWeighted Average
Grant Date Fair Value
(Per Unit)		RSUsWeighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 11,754 $226.392,024 $173.32
Granted373 $538.97403 $260.80
Vested(455)$209.15(502)$163.20
Forfeited(43)$155.15(29)$142.64
Unvested at March 31
1,629 $304.561,896 $195.02
A summary of the activity for PSUs to be settled in common stock for the three months ended March 31, 2026 and 2025 is as follows (PSUs in thousands):
20262025
PSUsWeighted Average
Grant Date Fair Value
(Per Unit)		PSUsWeighted Average
Grant Date Fair Value
(Per Unit)
Unvested at January 1348 $224.15425 $177.69
Granted53 $565.5692 $259.17
Vested(149)$174.50(165)$123.88
Unvested at March 31
252 $325.69352 $224.11
Grant Date Fair Value for Awards of Performance Units Inputs The Monte Carlo simulation valuation methodology applied the following key inputs:
20262025
Valuation date price based on February 26, 2026 and February 27, 2025 closing stock prices of Quanta common stock$565.05$259.26
Expected volatility (1)
35 %34 %
Risk-free interest rate3.45 %4.05 %
Term in years2.852.84
(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.