Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information
6 Months Ended
Jun. 30, 2011
Jul. 29, 2011
Entity Registrant Name QUANTA SERVICES INC  
Entity Central Index Key 0001050915  
Document Type 10-Q  
Document Period End Date Jun. 30, 2011  
Amendment Flag false  
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   207,422,401
Convertible Common Stock [Member]
Entity Common Stock, Shares Outstanding   3,909,110