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Acquisitions - Aggregate Consideration Paid or Payable and Allocation Net Assets (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jul. 20, 2017
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Business Acquisition [Line Items]            
Goodwill     $ 55,049 $ 55,000    
All Acquisitions 2018            
Business Acquisition [Line Items]            
Cash paid or payable $ 105,545   105,500      
Value of Quanta common stock issued 22,882   22,900      
Contingent consideration 16,471   16,471 16,471    
Fair value of total consideration transferred or estimated to be transferred 144,898          
Accounts receivable 18,404   18,404 18,404    
Contract assets 1,905   1,905 1,905    
Other current assets 8,484   8,484 8,484    
Property and equipment 23,674   23,674 23,674    
Other assets 576   576 576    
Identifiable intangible assets 52,364   52,364 52,364    
Contract liabilities (175)   (175) (175)    
Other current liabilities (11,204)   (11,204) (11,204)    
Deferred tax liabilities, net (4,179)   (4,179) (4,179)    
Other long-term liabilities 0   0 0    
Total identifiable net assets 89,849   89,849 89,849    
Goodwill 55,049          
Fair value of total consideration transferred or estimated to be transferred 144,898   144,898 144,898    
Stronghold            
Business Acquisition [Line Items]            
Cash paid or payable 351,014 $ 351,000        
Value of Quanta common stock issued 81,337 81,300        
Contingent consideration   $ 51,100       $ 51,084
Fair value of total consideration transferred or estimated to be transferred 483,435          
Accounts receivable 77,478   77,478 77,478    
Contract assets 11,913   11,913 11,913    
Other current assets 20,914   20,914 20,914    
Property and equipment 51,258   51,258 51,258    
Other assets 1,513   1,513 1,513    
Identifiable intangible assets 95,700   95,700 95,700    
Contract liabilities (13,489)   (13,489) (13,489)    
Other current liabilities (58,346)   (58,346) (58,346)    
Deferred tax liabilities, net 0   0 0    
Other long-term liabilities (48)   (48) (48)    
Total identifiable net assets 186,893   186,893 186,893    
Goodwill 296,542          
Fair value of total consideration transferred or estimated to be transferred 483,435   483,435 483,435    
Acquisitions 2017, other than Stronghold            
Business Acquisition [Line Items]            
Cash paid or payable 11,955       $ 12,000  
Value of Quanta common stock issued 8,267       $ 8,300  
Contingent consideration 0   0 0    
Fair value of total consideration transferred or estimated to be transferred 20,222          
Accounts receivable 7,157   7,157 7,157    
Contract assets 193   193 193    
Other current assets 170   170 170    
Property and equipment 1,480   1,480 1,480    
Other assets 12   12 12    
Identifiable intangible assets 8,091   8,091 8,091    
Contract liabilities (93)   (93) (93)    
Other current liabilities (2,705)   (2,705) (2,705)    
Deferred tax liabilities, net 0   0 0    
Other long-term liabilities 0   0 0    
Total identifiable net assets 14,305   14,305 14,305    
Goodwill 5,917          
Fair value of total consideration transferred or estimated to be transferred $ 20,222   $ 20,222 $ 20,222