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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
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, 2022 and 2021 is as follows (RSUs in thousands):
| 2022 |  | 2021
| RSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | RSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 3,880 |  |  | $61.64 |  | 3,869 |  |  | $37.57
Granted | 817 |  |  | $111.20 |  | 945 |  |  | $82.75
Vested | (1,257) |  |  | $48.48 |  | (1,442) |  |  | $36.92
Forfeited | (116) |  |  | $78.72 |  | (119) |  |  | $47.23
Unvested at September 30 | 3,324 |  |  | $78.39 |  | 3,253 |  |  | $50.71
A summary of the activity for PSUs to be settled in common stock for the nine months ended September 30, 2022 and 2021 is as follows (PSUs in thousands):
| 2022 |  | 2021
| PSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | PSUs |  | Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1 | 931 |  |  | $47.27 |  | 1,047 |  |  | $37.65
Granted | 153 |  |  | $119.74 |  | 174 |  |  | $90.44
Vested | (334) |  |  | $40.15 |  | (268) |  |  | $38.28
Forfeited | (17) |  |  | $58.79 |  | (11) |  |  | $36.90
Unvested at September 30 | 733 |  |  | $65.39 |  | 942 |  |  | $47.27
Grant Date Fair Value for Awards of Performance Units Inputs | The Monte Carlo simulation valuation methodology applied the following key inputs:
|  | 2022 |  | 2021
Valuation date price based on March 2, 2022 and March 25, 2021 closing stock prices of Quanta common stock |  | $110.24 |  | $83.48
Expected volatility |  | 39 | % |  | 36 | %
Risk-free interest rate |  | 1.64 | % |  | 0.26 | %
Term in years |  | 2.83 |  | 2.77

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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