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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 and 2022 is as follows (RSUs in thousands):
| 2023 |  | 2022
| RSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | RSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 3,263 |  |  | $78.74 |  | 3,880 |  |  | $61.64
Granted | 667 |  |  | $161.42 |  | 817 |  |  | $111.20
Vested | (1,199) |  |  | $66.14 |  | (1,257) |  |  | $48.48
Forfeited | (119) |  |  | $114.47 |  | (116) |  |  | $78.72
Unvested at September 30 | 2,612 |  |  | $104.39 |  | 3,324 |  |  | $78.39
A summary of the activity for PSUs to be settled in common stock for the nine months ended September 30, 2023 and 2022 is as follows (PSUs in thousands):
| 2023 |  | 2022
| PSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | PSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 733 |  |  | $65.39 |  | 931 |  |  | $47.27
Granted | 177 |  |  | $174.50 |  | 153 |  |  | $119.74
Vested | (413) |  |  | $35.12 |  | (334) |  |  | $40.15
Forfeited | (6) |  |  | $101.66 |  | (17) |  |  | $58.79
Unvested at September 30 | 491 |  |  | $129.70 |  | 733 |  |  | $65.39
Grant Date Fair Value for Awards of Performance Units Inputs | The Monte Carlo simulation valuation methodology applied the following key inputs:
|  | 2023 |  | 2022
Valuation date price based on March 9, 2023 and March 2, 2022 closing stock prices of Quanta common stock |  | $160.55 |  | $110.24
Historical volatility |  | 35 | % |  | 39 | %
Risk-free interest rate |  | 4.62 | % |  | 1.64 | %
Term in years |  | 2.81 |  | 2.83

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -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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