Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2022	Feb. 21, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	001-13831
Entity Registrant Name	Quanta Services, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-2851603
Entity Address, Address Line One	2727 North Loop West
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77008
City Area Code	713
Local Phone Number	629-7600
Title of 12(b) Security	Common Stock, $0.00001 par value
Trading Symbol	PWR
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 17.8
Entity Common Stock, Shares Outstanding		144,000,522
Documents Incorporated by Reference	Portions of the registrant’s Definitive Proxy Statement for the 2023 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Fiscal Year Focus	2022
Entity Central Index Key	0001050915