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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2024
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, 2024 and 2023 is as follows (RSUs in thousands):
| 2024 |  | 2023
| RSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | RSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 2,548 |  |  | $104.76 |  | 3,263 |  |  | $78.74
Granted | 812 |  |  | $241.38 |  | 667 |  |  | $161.42
Vested | (1,107) |  |  | $82.61 |  | (1,199) |  |  | $66.14
Forfeited | (126) |  |  | $158.16 |  | (119) |  |  | $114.47
Unvested at September 30 | 2,127 |  |  | $165.61 |  | 2,612 |  |  | $104.39
A summary of the activity for PSUs to be settled in common stock for the nine months ended September 30, 2024 and 2023 is as follows (PSUs in thousands):
| 2024 |  | 2023
| PSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | PSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 491 |  |  | $129.70 |  | 733 |  |  | $65.39
Granted | 109 |  |  | $263.34 |  | 177 |  |  | $174.50
Vested | (175) |  |  | $96.45 |  | (413) |  |  | $35.12
Forfeited | — |  |  | N/A |  | (6) |  |  | $101.66
Unvested at September 30 | 425 |  |  | $177.69 |  | 491 |  |  | $129.70
Grant Date Fair Value for Awards of Performance Units Inputs | The Monte Carlo simulation valuation methodology applied the following key inputs:
|  | 2024 |  | 2023
Valuation date price based on March 4, 2024 and March 9, 2023 closing stock prices of Quanta common stock |  | $243.34 |  | $160.55
Expected volatility |  | 33 | % |  | 35 | %
Risk-free interest rate |  | 4.43 | % |  | 4.62 | %
Term in years |  | 2.83 |  | 2.81

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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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