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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
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 three months ended March 31, 2021 is set forth below (shares in thousands):
| RSUs |  | Weighted Average Grant Date Fair Value (Per share)
Unvested at December 31, 2020 | 3,869 |  |  | $37.57
Granted | 898 |  |  | $82.21
Vested | (1,334) |  |  | $36.85
Forfeited | (42) |  |  | $37.37
Unvested at March 31, 2021 | 3,391 |  |  | $49.69
A summary of the activity for PSUs to be settled in common stock for the three months ended March 31, 2021 is set forth below (shares in thousands):
| PSUs |  | Weighted Average Grant Date Fair Value (Per share)
Unvested at December 31, 2020 | 1,047 |  |  | $37.65
Granted | 172 |  |  | $90.28
Vested | (268) |  |  | $38.28
Forfeited | (11) |  |  | $36.90
Unvested at March 31, 2021 | 940 |  |  | $47.14
Grant Date Fair Value for Awards of Performance Units Inputs | The Monte Carlo simulation valuation methodology applied the following key inputs:
|  | 2021
Valuation date price based on March 25, 2021 closing stock prices of Quanta common stock |  | $83.48
Expected volatility |  | 36 | %
Risk-free interest rate |  | 0.26 | %
Term in years |  | 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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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