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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (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   $ 51,100 $ 18,700 $ 1,000
Goodwill   302,408 45,186  
Stronghold        
Business Acquisition [Line Items]        
Cash paid or payable $ 351,014      
Value of Quanta common stock issued 81,337      
Contingent consideration 51,084      
Fair value of total consideration transferred or estimated to be transferred 483,435      
Accounts receivable 77,478      
Costs and estimated earnings in excess of billings on uncompleted contracts 11,913      
Other current assets 20,914      
Property and equipment 51,258      
Other assets 1,513      
Identifiable intangible assets 95,700      
Current liabilities (71,835)      
Deferred tax liabilities, net 0      
Other long-term liabilities (48)      
Total identifiable net assets 186,893      
Goodwill 296,542      
Fair value of total consideration transferred or estimated to be transferred $ 483,435      
Acquisitions 2017, other than Stronghold        
Business Acquisition [Line Items]        
Cash paid or payable   11,904    
Value of Quanta common stock issued   8,267    
Contingent consideration   0    
Fair value of total consideration transferred or estimated to be transferred   20,171    
Accounts receivable   7,157    
Costs and estimated earnings in excess of billings on uncompleted contracts   193    
Other current assets   170    
Property and equipment   1,480    
Other assets   12    
Identifiable intangible assets   8,091    
Current liabilities   (2,798)    
Deferred tax liabilities, net   0    
Other long-term liabilities   0    
Total identifiable net assets   14,305    
Goodwill   5,866    
Fair value of total consideration transferred or estimated to be transferred   $ 20,171    
Acquisitions 2016        
Business Acquisition [Line Items]        
Cash paid or payable     75,941  
Value of Quanta common stock issued     1,508  
Contingent consideration     18,683  
Fair value of total consideration transferred or estimated to be transferred     96,132  
Accounts receivable     14,414  
Costs and estimated earnings in excess of billings on uncompleted contracts     1,237  
Other current assets     8,582  
Property and equipment     44,863  
Other assets     2,553  
Identifiable intangible assets     11,467  
Current liabilities     (12,097)  
Deferred tax liabilities, net     (13,484)  
Other long-term liabilities     (5,326)  
Total identifiable net assets     52,209  
Goodwill     43,923  
Fair value of total consideration transferred or estimated to be transferred     $ 96,132