Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v2.4.0.8
Document and Entity Information
9 Months Ended
Sep. 30, 2014
Nov. 03, 2014
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2014  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q3  
Trading Symbol PWR  
Entity Registrant Name QUANTA SERVICES INC  
Entity Central Index Key 0001050915  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   212,463,762
Series F Preferred Stock [Member]
   
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   1
Series G Preferred Stock [Member]
   
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   1
Exchangeable Shares Associated with Series F Preferred Stock [Member]
   
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,500,000
Exchangeable Shares Associated with Series G Preferred Stock [Member]
   
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   899,858
Exchangeable Shares [Member]
   
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   821,519