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Equity-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Grant Date Fair Value for Awards of Performance Units Inputs The grant date fair values for awards of PSUs granted in the nine months ended September 30, 2019 and 2018, which included market-based metrics, were determined using a Monte Carlo simulation valuation methodology using the following key inputs:
 
 
2019
 
2018
Valuation date price based on March 8, 2019 and February 28, 2018 closing stock prices of Quanta common stock
 
$35.19
 
$34.44
Expected volatility
 
25
%
 
34
%
Risk-free interest rate
 
2.43
%
 
2.39
%
Term in years
 
2.81

 
2.84