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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Contingent consideration payments (up to) $ 13,900      
Goodwill 2,121,014 $ 2,022,675 $ 1,899,879 $ 1,868,600
2020 Acquisitions        
Business Acquisition [Line Items]        
Cash consideration $ 351,671      
Number of shares granted for acquired companies (in shares) 1,334,469      
Value of Quanta common stock issued $ 57,119      
Contingent consideration payments (up to) $ 6,900      
Contingent consideration financial target term 5 years      
Fair value of contingent consideration liability $ 2,250      
Identifiable intangible assets 96,826      
Bargain purchase gain 0      
Revenues included in consolidated results of operations 133,500      
Income from continuing operations before income taxes included in consolidated results of operations (1,300)      
Acquisition-related costs 17,500      
2019 Acquisitions        
Business Acquisition [Line Items]        
Cash consideration   $ 395,258    
Number of shares granted for acquired companies (in shares)   60,860    
Value of Quanta common stock issued   $ 1,791    
Fair value of contingent consideration liability   0    
Identifiable intangible assets   192,786    
Bargain purchase gain   3,139    
Goodwill expected to be deductible for income tax purposes $ 75,600 82,100 21,600  
Revenues included in consolidated results of operations   223,300    
Income from continuing operations before income taxes included in consolidated results of operations   7,500    
Acquisition-related costs   $ 22,100    
2018 Acquisitions        
Business Acquisition [Line Items]        
Cash consideration     $ 108,300  
Number of shares granted for acquired companies (in shares)     679,668  
Value of Quanta common stock issued     $ 22,900  
Contingent consideration payments (up to)     18,000  
Fair value of contingent consideration liability     16,500  
Revenues included in consolidated results of operations     71,100  
Income from continuing operations before income taxes included in consolidated results of operations     (8,900)  
Acquisition-related costs     $ 11,000  
2018 Acquisitions | Minimum        
Business Acquisition [Line Items]        
Contingent consideration financial target term     3 years  
2018 Acquisitions | Maximum        
Business Acquisition [Line Items]        
Contingent consideration financial target term     5 years