Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information
6 Months Ended
Jun. 30, 2012
Jul. 31, 2012
Entity Registrant Name QUANTA SERVICES INC  
Entity Central Index Key 0001050915  
Document Type 10-Q  
Document Period End Date Jun. 30, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   209,214,607
Convertible Common Stock [Member]
Entity Common Stock, Shares Outstanding   3,909,110