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Acquisitions (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2018
Jul. 20, 2017
Jan. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]                
Contingent consideration, maximum $ 154,600       $ 154,600   $ 154,600  
Net tangible assets acquired             102,400  
Other intangible assets acquired             123,600  
Goodwill acquired         41,709   344,100  
Revenues included in consolidated results of operations         2,417,576 $ 2,178,170    
Income (loss) before taxes         56,614 $ 71,032    
Electric Power Infrastructure Services Division                
Business Acquisition [Line Items]                
Goodwill acquired         41,709      
Oil and Gas Infrastructure Services Division                
Business Acquisition [Line Items]                
Goodwill acquired         0      
Acquisitions 2018                
Business Acquisition [Line Items]                
Cash paid or payable 39,291       39,300      
Number of shares granted for acquired companies (in shares)     379,817          
Value of Quanta common stock issued 13,549   $ 13,500          
Contingent consideration, maximum     $ 15,000          
Contingent consideration financial target term     5 years          
Contingent consideration, liability 13,705       13,705   13,705  
Other intangible assets acquired         19,836      
Goodwill acquired 41,709              
Goodwill expected to be deductible for income tax 9,800       9,800   9,800  
Revenues included in consolidated results of operations         8,100      
Income (loss) before taxes         (5,300)      
Acquisition costs         5,600      
Acquisitions 2018 | Electric Power Infrastructure Services Division                
Business Acquisition [Line Items]                
Goodwill acquired         41,700      
Stronghold, Ltd. and Stronghold Specialty, Ltd.                
Business Acquisition [Line Items]                
Cash paid or payable 351,014 $ 351,000            
Number of shares granted for acquired companies (in shares)   2,693,680            
Value of Quanta common stock issued 81,337 $ 81,300            
Contingent consideration, maximum   $ 100,000            
Contingent consideration financial target term   3 years            
Contingent consideration, liability 51,084 $ 51,100     51,084   51,084  
Goodwill acquired 296,542              
Stronghold, Ltd. and Stronghold Specialty, Ltd. | Oil and Gas Infrastructure Services Division                
Business Acquisition [Line Items]                
Goodwill acquired               $ 296,500
Acquisitions 2017, other than Stronghold                
Business Acquisition [Line Items]                
Cash paid or payable 11,904             $ 11,900
Number of shares granted for acquired companies (in shares)               288,666
Value of Quanta common stock issued 8,267             $ 8,300
Contingent consideration, liability 0       $ 0   $ 0  
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               $ 302,400
Scenario, Forecast | Acquisitions 2018                
Business Acquisition [Line Items]                
Cash paid or payable       $ 12,200