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Acquisitions - Narrative (Details)		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 17, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) business shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($) business shares
Business Acquisition [Line Items]
Net tangible assets acquired						$ 183,000,000.0
Intangible assets						265,500,000
Goodwill, acquired during period						434,600,000
Cash payment for contingent consideration liabilities					$ 5,000,000.0
Acquisitions 2024
Business Acquisition [Line Items]
Consideration transferred				$ 540,168,000
Number of shares granted for acquired companies (in shares) | shares				286,425
Value of Quanta common stock issued				$ 60,821,000
Number of businesses acquired | business				5
Cash consideration				$ 463,884,000
Intangible assets				179,977,000
Goodwill expected to be deductible for income tax		$ 15,200,000		15,200,000		15,200,000
Revenues included in consolidated results of operations		76,600,000		144,300,000
Income (loss) before taxes		(4,700,000)		(13,800,000)
Amortization expense		7,000,000.0		11,800,000
Acquisition costs		4,300,000		10,200,000
Acquisitions 2023
Business Acquisition [Line Items]
Number of shares granted for acquired companies (in shares) | shares							1,238,576
Value of Quanta common stock issued							$ 158,900,000
Number of businesses acquired | business							5
Cash consideration							$ 777,300,000
Revenues included in consolidated results of operations			$ 143,100,000		236,600,000
Income (loss) before taxes			12,900,000		(3,200,000)
Amortization expense			6,400,000		15,000,000.0
Acquisition costs			$ 0		$ 17,800,000
Acquisitions, Multiple Periods
Business Acquisition [Line Items]
Contingent consideration payments (up to)		$ 365,600,000		$ 365,600,000		$ 365,600,000
Cupertino Electric Inc. (Cupertino) | Subsequent Event
Business Acquisition [Line Items]
Consideration transferred	$ 1,500,000,000
Value of Quanta common stock issued	216,300,000
Contingent consideration payments (up to)	$ 200,000,000.0
Business combination, period for performance targets to be achieved (in years)	3 years

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