Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 31, 2019
Feb. 25, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Fiscal Period Focus FY    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Current Fiscal Year End Date --12-31    
Entity File Number 001-13831    
Entity Registrant Name Quanta Services, Inc.    
Entity Central Index Key 0001050915    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 74-2851603    
Entity Address, Address Line One 2800 Post Oak Boulevard, Suite 2600    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77056    
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    
Entity Shell Company false    
Entity Public Float     $ 5.4
Entity Common Stock, Shares Outstanding   142,508,874  
Documents Incorporated by Reference
Portions of the Registrant’s Definitive Proxy Statement for the 2020 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.