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Acquisitions - 2017 Acquisitions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jul. 20, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Contingent consideration, maximum   $ 139,500    
Contingent consideration   51,100 $ 18,700 $ 1,000
Goodwill acquired   302,408 $ 45,186  
Stronghold        
Business Acquisition [Line Items]        
Cash paid or payable $ 351,014      
Number of shares granted for acquired companies (in shares) 2,693,680      
Value of Quanta common stock issued $ 81,337      
Contingent consideration, maximum $ 100,000      
Contingent consideration financial target term 3 years      
Contingent consideration $ 51,084      
Goodwill acquired $ 296,542      
Acquisitions 2017, other than Stronghold        
Business Acquisition [Line Items]        
Cash paid or payable   $ 11,904    
Number of shares granted for acquired companies (in shares)   288,666    
Value of Quanta common stock issued   $ 8,267    
Contingent consideration   0    
Goodwill acquired   5,866    
Acquisitions 2017        
Business Acquisition [Line Items]        
Net tangible assets acquired   97,400    
Other intangible assets acquired   103,800    
Goodwill acquired   $ 302,400