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Stock-Based Compensation - Grant Date Fair Value for Awards of Performance Units Inputs (Details) - PSUs - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Mar. 04, 2024	Mar. 09, 2023	Mar. 02, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Valuation date price based on March 9, 2023, March 2, 2022 and March 25, 2021 closing stock prices of Quanta common stock (in usd per share)				$ 243.34	$ 160.55	$ 110.24
Expected volatility	33.00%	35.00%	39.00%
Risk-free interest rate	4.43%	4.62%	1.64%
Term in years	2 years 9 months 29 days	2 years 9 months 21 days	2 years 9 months 29 days

X

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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