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
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Goodwill, beginning balance $ 1,596,695  
Goodwill acquired 30,310  
Purchase price allocation adjustments (8,113)  
Foreign currency translation adjustments (20,238)  
Goodwill, ending balance 1,598,654 $ 1,596,695
Electric Power Division [Member]    
Goodwill [Line Items]    
Goodwill, beginning balance 1,223,224  
Goodwill acquired 13,509 72,300
Purchase price allocation adjustments 750  
Foreign currency translation adjustments (12,422)  
Goodwill, ending balance 1,225,061 1,223,224
Oil and Gas Infrastructure Division [Member]    
Goodwill [Line Items]    
Goodwill, beginning balance 373,471  
Goodwill acquired 16,801 94,100
Purchase price allocation adjustments (8,863)  
Foreign currency translation adjustments (7,816)  
Goodwill, ending balance $ 373,593 $ 373,471