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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Summary 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 years ended December 31, 2022, 2021 and 2020 is as follows (RSUs in thousands):
| 2022 |  | 2021 |  | 2020
| RSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | 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 |  | 3,265 |  |  | $35.34
Granted | 860 |  |  | $113.07 |  | 1,642 |  |  | $94.83 |  | 2,029 |  |  | $39.91
Vested | (1,319) |  |  | $50.60 |  | (1,476) |  |  | $37.03 |  | (1,269) |  |  | $35.69
Forfeited | (158) |  |  | $84.94 |  | (155) |  |  | $48.52 |  | (156) |  |  | $36.67
Unvested at December 31 | 3,263 |  |  | $78.74 |  | 3,880 |  |  | $61.64 |  | 3,869 |  |  | $37.57
A summary of the activity for PSUs to be settled in common stock for the years ended December 31, 2022, 2021 and 2020 is as follows (PSUs in thousands):
| 2022 |  | 2021 |  | 2020
| PSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | PSUs |  | Weighted Average Grant Date Fair Value (Per Unit) |  | PSUs |  | Weighted Average Grant Date Fair Value (Per Unit) (1)
Unvested at January 1 | 931 |  |  | $47.27 |  | 1,047 |  |  | $37.65 |  | 848 |  |  | $40.04
Granted | 153 |  |  | $119.74 |  | 174 |  |  | $90.44 |  | 437 |  |  | $34.60
Vested | (334) |  |  | $40.15 |  | (268) |  |  | $38.28 |  | (238) |  |  | $41.87
Forfeited | (17) |  |  | $58.79 |  | (22) |  |  | $41.86 |  | — |  |  | N/A
Unvested at December 31 | 733 |  |  | $65.39 |  | 931 |  |  | $47.27 |  | 1,047 |  |  | $37.65
(1) Certain weighted average grant date fair value per unit amounts related to the year ended December 31, 2020 were recast in the year ended December 31, 2021 to conform to the correction of the valuation of PSUs described below.
Grant Date Fair Value for Awards of Performance Units Inputs | The Monte Carlo simulation valuation methodology applied the following key inputs:
|  | 2022 |  | 2021 |  | 2020
Valuation date price based on March 2, 2022, March 25, 2021 and March 26, 2020 closing stock prices of Quanta common stock |  | $110.24 |  | $83.48 |  | $31.49
Expected volatility |  | 39 | % |  | 36 | % |  | 34 | %
Risk-free interest rate |  | 1.64 | % |  | 0.26 | % |  | 0.35 | %
Term in years |  | 2.83 |  | 2.77 |  | 2.76

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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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