Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets (Details)

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Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Summary of changes in Quanta's goodwill    
Goodwill $ 1,728,226 $ 1,664,474
Accumulated impairment (63,264) (63,264)
Goodwill acquired during the period 64,779  
Foreign currency translation related to goodwill (1,027)  
Goodwill, net 1,664,962 1,601,210
Electric Power Division [Member]
   
Summary of changes in Quanta's goodwill    
Goodwill 1,045,289 988,702
Goodwill acquired during the period 57,451  
Foreign currency translation related to goodwill (864)  
Goodwill, net 1,045,289 988,702
Natural Gas and Pipeline Division [Member]
   
Summary of changes in Quanta's goodwill    
Goodwill 120,763 113,598
Goodwill acquired during the period 7,328  
Foreign currency translation related to goodwill (163)  
Goodwill, net 120,763 113,598
Telecommunications Division [Member]
   
Summary of changes in Quanta's goodwill    
Goodwill 562,174 562,174
Accumulated impairment (63,264) (63,264)
Goodwill, net $ 498,910 $ 498,910