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Acquisitions - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 17, 2024
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
business
shares
Business Acquisition [Line Items]          
Contingent consideration, liability   $ 387,591   $ 387,591 $ 344,984
Cash consideration paid, net of cash acquired   394,263 $ 384,071    
Intangible assets   207,389      
Acquisitions, Multiple Periods          
Business Acquisition [Line Items]          
Contingent consideration payments (up to)   689,600   689,600  
Net tangible assets acquired       576,100  
Intangible assets       935,600  
Goodwill, acquired during period       1,290,000  
2025 Acquisitions          
Business Acquisition [Line Items]          
Cash consideration   389,373      
Value of Quanta common stock issued   161,554      
Contingent consideration, liability   38,342   38,342  
Fair value of total consideration transferred or estimated to be transferred   589,269      
Goodwill expected to be deductible for income tax   226,400   226,400  
Revenues included in consolidated results of operations   96,900      
Income (loss) before taxes   3,500      
Amortization expense   7,900      
Civil Solutions and Electric Engineering Acquisitions          
Business Acquisition [Line Items]          
Cash consideration   $ 389,400      
Number of shares granted for acquired companies (in shares) | shares   515,822      
Value of Quanta common stock issued   $ 161,600      
Contingent consideration payments (up to)   $ 109,400   $ 109,400  
Business combination, period for performance targets to be achieved (in years)   3 years      
2024 Acquisitions          
Business Acquisition [Line Items]          
Revenues included in consolidated results of operations     67,700    
Income (loss) before taxes     (3,200)    
Amortization expense     $ 4,800    
CEI          
Business Acquisition [Line Items]          
Number of shares granted for acquired companies (in shares) | shares 882,926        
Value of Quanta common stock issued $ 216,300        
Contingent consideration payments (up to) $ 200,000        
Business combination, period for performance targets to be achieved (in years) 3 years        
Contingent consideration, liability $ 164,000        
Fair value of total consideration transferred or estimated to be transferred 2,040,000        
Aggregate cash consideration paid 1,650,000        
Cash consideration paid, net of cash acquired $ 1,240,000        
Percentage of contingent consideration that can be paid in common stock 10.00%        
2024 Acquisitions, Excluding CEI Acquisition          
Business Acquisition [Line Items]          
Cash consideration         $ 540,900
Number of shares granted for acquired companies (in shares) | shares         334,472
Value of Quanta common stock issued         $ 74,800
Contingent consideration, liability         $ 24,300
Number of businesses acquired | business         7