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Stock-Based Compensation - Grant Date Fair Value for Awards of Performance Units Inputs (Details) - Performance Stock Units (PSUs) to be settled in Common Stock - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Feb. 26, 2026	Feb. 27, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Valuation date price based on February 27, 2025 and March 4, 2024 closing stock prices of Quanta common stock (in USD per share)			$ 565.05	$ 259.26
Expected volatility (in percent)	35.00%	34.00%
Risk-free interest rate (in percent)	3.45%	4.05%
Term in years	2 years 10 months 6 days	2 years 10 months 2 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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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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