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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Grant Date Fair Value for Awards of Performance Units Inputs The Monte Carlo simulation valuation methodology applied the following key inputs:
 
 
2020
 
2019
Valuation date price based on March 26, 2020 and March 8, 2019 closing stock prices of Quanta common stock
 
$31.49
 
$35.19
Expected volatility
 
34
%
 
25
%
Risk-free interest rate
 
0.35
%
 
2.43
%
Term in years
 
2.76

 
2.81