| Document and Entity Information | Aug. 07, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 07, 2024 |
| Entity Registrant Name | Quanta Services, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-13831 |
| Entity Tax Identification Number | 74-2851603 |
| Entity Address Address Line 1 | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.00001 par value |
| Trading Symbol | PWR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001050915 |
