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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jul. 20, 2017
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 311,403 $ 311,400  
Stronghold        
Business Acquisition [Line Items]        
Cash paid or payable $ 360,009      
Value of Quanta common stock issued 81,337      
Contingent consideration 51,084      
Fair value of total consideration transferred or estimated to be transferred 492,430      
Accounts receivable 77,478      
Costs and estimated earnings in excess of billings on uncompleted contracts 22,496      
Other current assets 20,914      
Property and equipment 51,258      
Other assets 1,513      
Identifiable intangible assets 95,700      
Current liabilities (82,418)      
Deferred tax liabilities, net 0      
Other long-term liabilities (48)      
Total identifiable net assets 186,893      
Goodwill 305,537      
Fair value of total consideration transferred or estimated to be transferred $ 492,430      
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 0  
Fair value of total consideration transferred or estimated to be transferred   20,171    
Accounts receivable   7,157 7,157  
Costs and estimated earnings in excess of billings on uncompleted contracts   193 193  
Other current assets   170 170  
Property and equipment   1,480 1,480  
Other assets   12 12  
Identifiable intangible assets   8,091 8,091  
Current liabilities   (2,798) (2,798)  
Deferred tax liabilities, net   0 0  
Other long-term liabilities   0 0  
Total identifiable net assets   14,305 14,305  
Goodwill   5,866    
Fair value of total consideration transferred or estimated to be transferred   $ 20,171 $ 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