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Stock-Based Compensation (Tables) | 9 Months Ended
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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):
| 2025 |  | 2024
| RSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | RSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 2,024 |  |  | $173.32 |  | 2,548 |  |  | $104.76
Granted | 575 |  |  | $287.04 |  | 812 |  |  | $241.38
Vested | (692) |  |  | $156.28 |  | (1,107) |  |  | $82.61
Forfeited | (91) |  |  | $228.22 |  | (126) |  |  | $158.16
Unvested at September 30 | 1,816 |  |  | $213.15 |  | 2,127 |  |  | $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):
| 2025 |  | 2024
| PSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | PSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 425 |  |  | $177.69 |  | 491 |  |  | $129.70
Granted | 92 |  |  | $259.17 |  | 109 |  |  | $263.34
Vested | (165) |  |  | $123.88 |  | (175) |  |  | $96.45
Forfeited | (4) |  |  | $222.94 |  | — |  |  | N/A
Unvested at September 30 | 348 |  |  | $224.12 |  | 425 |  |  | $177.69
Grant Date Fair Value for Awards of Performance Units Inputs | The Monte Carlo simulation valuation methodology applied the following key inputs:
|  | 2025 |  | 2024
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 rate |  | 4.05 | % |  | 4.43 | %
Term in years |  | 2.84 |  | 2.83
(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.

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- Definition Schedule Of Share Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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