Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail)

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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Goodwill [Line Items]  
Goodwill balance at December 31, 2012 $ 1,537,645
Goodwill acquired during 2013 1,052
Foreign currency translation related to goodwill (8,559)
Goodwill balance at June 30, 2013 1,530,138
Electric Power Division [Member]
 
Goodwill [Line Items]  
Goodwill balance at December 31, 2012 1,065,152
Goodwill acquired during 2013 1,052
Foreign currency translation related to goodwill (7,490)
Goodwill balance at June 30, 2013 1,058,714
Natural Gas and Pipeline Division [Member]
 
Goodwill [Line Items]  
Goodwill balance at December 31, 2012 137,703
Goodwill acquired during 2013   
Foreign currency translation related to goodwill (1,069)
Goodwill balance at June 30, 2013 136,634
Fiber Optic Licensing Division[Member]
 
Goodwill [Line Items]  
Goodwill balance at December 31, 2012 334,790
Goodwill acquired during 2013   
Foreign currency translation related to goodwill   
Goodwill balance at June 30, 2013 $ 334,790