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Acquisitions - Narrative (Details)
$ in Thousands
 12 Months Ended
Oct. 13, 2021
USD ($)
shares
Dec. 31, 2021
USD ($)
Businesses
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
division
shares
Business Acquisition [Line Items]        
Number of specialty utility foundation and pole-setting contractors | division       2
Goodwill expected to be deductible for income tax purposes   $ 1,400,000 $ 72,600 $ 82,100
Cash payment for contingent consideration liabilities     $ 76,000  
Shares transferred in settlement of contingent consideration liabilities (in shares) | shares     4,277  
Blattner        
Business Acquisition [Line Items]        
Aggregate cash consideration paid $ 2,370,000      
Number of shares granted for acquired companies (in shares) | shares 3,326,955      
Value of Quanta common stock issued $ 345,422      
Contingent consideration payments (up to) $ 300,000      
Post-acquisition period, financial performance objectives 3 years      
Post-acquisition period, deferred earnings, accrued interest 5.00%      
Fair value of contingent consideration liability $ 125,632      
Cash consideration $ 2,372,528      
All Other        
Business Acquisition [Line Items]        
Number of shares granted for acquired companies (in shares) | shares   187,093    
Value of Quanta common stock issued   $ 16,922    
Fair value of contingent consideration liability   0    
Cash consideration   328,846    
2021 Acquisitions        
Business Acquisition [Line Items]        
Revenues included in consolidated results of operations   499,600    
Income from continuing operations before income taxes included in consolidated results of operations   (71,600)    
Amortization expense   80,300    
Acquisition-related costs   $ 41,500    
2020 Acquisitions        
Business Acquisition [Line Items]        
Number of shares granted for acquired companies (in shares) | shares     1,334,469  
Value of Quanta common stock issued     $ 57,119  
Contingent consideration payments (up to)     6,900  
Fair value of contingent consideration liability     2,250  
Cash consideration     $ 359,624  
Contingent consideration financial target term     5 years  
Revenues included in consolidated results of operations     $ 133,500  
Income from continuing operations before income taxes included in consolidated results of operations     (1,300)  
Amortization expense     6,400  
Acquisition-related costs     $ 17,500  
2019 Acquisitions        
Business Acquisition [Line Items]        
Number of shares granted for acquired companies (in shares) | shares       60,860
Value of Quanta common stock issued       $ 1,800
Cash consideration       395,300
Revenues included in consolidated results of operations       223,300
Income from continuing operations before income taxes included in consolidated results of operations       7,500
Amortization expense       14,600
Acquisition-related costs       $ 22,100
Businesses That Provide Electric Power Construction Services In The United States        
Business Acquisition [Line Items]        
Number of businesses acquired | Businesses   3    
All Acquisitions        
Business Acquisition [Line Items]        
Contingent consideration payments (up to)   $ 313,700