Stock-Based Compensation - Grant Date Fair Value for Awards of Performance Units Inputs (Details) - Performance Stock Units - $ / shares	Mar. 04, 2024	Mar. 09, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Valuation date price based on March 4, 2024 and March 9, 2023 closing stock prices of Quanta common stock (usd per share)	$ 243.34	$ 160.55
Expected volatility (in percent)	33.00%	35.00%
Risk-free interest rate (in percent)	4.43%	4.62%
Term in years	2 years 9 months 29 days	2 years 9 months 21 days