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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of RSUs and PSUs to be Settled in Common Stock Activity

A summary of the activity for RSUs to be settled in common stock for the years ended December 31, 2023, 2022 and 2021 is as follows (RSUs in thousands):

			2023												2022												2021
			RSUs						Weighted Average Grant Date Fair Value (Per Unit)						RSUs						Weighted Average Grant Date Fair Value (Per Unit)						RSUs						Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1			3,263						$78.74						3,880						$61.64						3,869						$37.57
Granted			684						$161.81						860						$113.07						1,642						$94.83
Vested			(1,268)						$68.06						(1,319)						$50.60						(1,476)						$37.03
Forfeited			(131)						$116.29						(158)						$84.94						(155)						$48.52
Unvested at December 31			2,548						$104.76						3,263						$78.74						3,880						$61.64

A summary of the activity for PSUs to be settled in common stock for the years ended December 31, 2023, 2022 and 2021 is as follows (PSUs in thousands):

			2023												2022												2021
			PSUs						Weighted Average Grant Date Fair Value (Per Unit)						PSUs						Weighted Average Grant Date Fair Value (Per Unit)						PSUs						Weighted Average Grant Date Fair Value (Per Unit)
Unvested at January 1			733						$65.39						931						$47.27						1,047						$37.65
Granted			177						$174.50						153						$119.74						174						$90.44
Vested			(413)						$35.12						(334)						$40.15						(268)						$38.28
Forfeited			(6)						$101.66						(17)						$58.79						(22)						$41.86
Unvested at December 31			491						$129.70						733						$65.39						931						$47.27

Grant Date Fair Value for Awards of Performance Units Inputs

The Monte Carlo simulation valuation methodology applied the following key inputs:

						2023						2022						2021
Valuation date price based on March 9, 2023, March 2, 2022 and March 25, 2021 closing stock prices of Quanta common stock						$160.55						$110.24						$83.48
Expected volatility						35		%				39		%				36		%
Risk-free interest rate						4.62		%				1.64		%				0.26		%
Term in years						2.81						2.83						2.77

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Schedule Of Share Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block]

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- Definition

Tabular disclosure of the changes in outstanding nonvested shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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