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
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Summary of changes in Quanta's goodwill    
Goodwill $ 1,709,887 $ 1,664,474
Accumulated impairment (63,264) (63,264)
Goodwill acquired during the period 42,296  
Foreign currency translation related to goodwill 3,117  
Goodwill, net 1,646,623 1,601,210
Electric Power Division [Member]
   
Summary of changes in Quanta's goodwill    
Goodwill 1,026,609 988,702
Goodwill acquired during the period 34,968  
Foreign currency translation related to goodwill 2,939  
Goodwill, net 1,026,609 988,702
Natural Gas and Pipeline Division [Member]
   
Summary of changes in Quanta's goodwill    
Goodwill 121,104 113,598
Goodwill acquired during the period 7,328  
Foreign currency translation related to goodwill 178  
Goodwill, net 121,104 113,598
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