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Acquisitions (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 20, 2017
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Acquisition
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Acquisition
shares
Business Acquisition [Line Items]              
Contingent consideration, maximum   $ 139,500   $ 139,500   $ 139,500  
Net tangible assets acquired           97,400  
Other intangible assets acquired           103,800  
Goodwill acquired       311,403   311,400  
Revenues included in consolidated results of operations   2,609,307 $ 2,042,186 6,987,851 $ 5,548,353    
Loss (income) before taxes   (132,195) $ (128,063) (307,832) $ (193,789)    
Electric Power Infrastructure Services Division              
Business Acquisition [Line Items]              
Goodwill acquired       5,866      
Oil and Gas Infrastructure Services Division              
Business Acquisition [Line Items]              
Goodwill acquired       305,537      
Stronghold, Ltd. and Stronghold Specialty, Ltd.              
Business Acquisition [Line Items]              
Aggregate consideration paid $ 360,000            
Number of shares granted for acquired companies (in shares) | 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, liability $ 51,084            
Cash paid or payable 360,009            
Goodwill acquired $ 305,537            
Stronghold, Ltd. and Stronghold Specialty, Ltd. | Oil and Gas Infrastructure Services Division              
Business Acquisition [Line Items]              
Goodwill acquired       $ 305,500      
Acquisitions 2017, other than Stronghold              
Business Acquisition [Line Items]              
Number of shares granted for acquired companies (in shares) | shares       288,666      
Value of Quanta common stock issued       $ 8,267      
Contingent consideration, liability   0   $ 0   0  
Number of business acquisitions | Acquisition       2      
Cash paid or payable       $ 11,904      
Goodwill acquired       5,866      
Acquisitions 2017, other than Stronghold | Electric Power Infrastructure Services Division              
Business Acquisition [Line Items]              
Goodwill acquired       5,900      
Acquisitions 2017              
Business Acquisition [Line Items]              
Goodwill expected to be deductible for income tax   311,400   311,400   $ 311,400  
Revenues included in consolidated results of operations   87,200   89,400      
Loss (income) before taxes   6,400   8,200      
Acquisition costs   $ 3,200   $ 5,400      
Acquisitions 2016              
Business Acquisition [Line Items]              
Number of shares granted for acquired companies (in shares) | shares             70,840
Value of Quanta common stock issued             $ 1,508
Contingent consideration, maximum             39,500
Contingent consideration, liability             $ 18,683
Number of business acquisitions | Acquisition             5
Cash paid or payable             $ 75,941
Goodwill acquired             43,923
Goodwill expected to be deductible for income tax             $ 2,000
Acquisitions 2016 | Electric Power Infrastructure Services Segment              
Business Acquisition [Line Items]              
Number of business acquisitions | Acquisition             4
Acquisitions 2016 | Electric Power Infrastructure Services Division              
Business Acquisition [Line Items]              
Goodwill acquired             $ 23,600
Acquisitions 2016 | Oil and Gas Infrastructure Services Division              
Business Acquisition [Line Items]              
Goodwill acquired             $ 20,300