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, 2014
Goodwill [Line Items]  
Goodwill, beginning balance $ 1,780,717
Goodwill acquired 58,344
Foreign currency translation related to goodwill 3,928
Goodwill, ending balance 1,842,989
Electric Power Division [Member]
 
Goodwill [Line Items]  
Goodwill, beginning balance 1,168,084
Goodwill acquired 50,788
Foreign currency translation related to goodwill 1,111
Goodwill, ending balance 1,219,983
Oil and Gas Infrastructure Division [Member]
 
Goodwill [Line Items]  
Goodwill, beginning balance 277,843
Goodwill acquired 7,556
Foreign currency translation related to goodwill 2,817
Goodwill, ending balance 288,216
Fiber Optic Licensing Division[Member]
 
Goodwill [Line Items]  
Goodwill, beginning balance 334,790
Goodwill acquired 0
Foreign currency translation related to goodwill 0
Goodwill, ending balance $ 334,790