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Acquisitions - Narrative (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 25, 2025
USD ($)
shares
Jul. 17, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
business
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
business
shares
Business Combination [Line Items]                
Contingent consideration, liability     $ 493,986,000   $ 493,986,000   $ 493,986,000 $ 344,984,000
Cash consideration paid, net of cash acquired         1,783,250,000 $ 1,724,440,000    
Cash payments for contingent consideration liabilities         $ 106,800,000 0    
Stock issued as payment for contingent consideration liabilities (in shares) | shares         158,040      
Acquisition costs     19,500,000 $ 6,600,000 $ 33,700,000 16,800,000    
Underground and Infrastructure                
Business Combination [Line Items]                
Goodwill period increase     44,000,000          
Acquisitions, Multiple Periods                
Business Combination [Line Items]                
Contingent consideration payments (up to)     612,900,000   612,900,000   612,900,000  
Net tangible assets acquired             350,400,000  
Intangible assets             818,800,000  
Goodwill, acquired during period             1,370,000,000  
Dynamic Systems, LLC                
Business Combination [Line Items]                
Cash consideration $ 1,260,000,000       1,259,262,000      
Common stock consideration transferred in business acquisition $ 218,800,000              
Number of shares granted for acquired companies (in shares) | shares 518,772              
Contingent consideration payments (up to) $ 216,000,000.0              
Business combination, period for performance targets to be achieved (in years) 2 years              
Percentage of contingent consideration that can be paid in common stock 15.00%              
Contingent consideration, liability $ 190,600,000   190,561,000   190,561,000   190,561,000  
Value of Quanta common stock issued         218,756,000      
Consideration transferred in business acquisition         1,668,579,000      
Intangible assets         532,400,000      
Business Acquisitions                
Business Combination [Line Items]                
Cash consideration         $ 605,642,000      
Number of shares granted for acquired companies (in shares) | shares         515,822      
Contingent consideration payments (up to)     127,900,000   $ 127,900,000   127,900,000  
Business combination, period for performance targets to be achieved (in years)         3 years      
Contingent consideration, liability     98,856,000   $ 98,856,000   98,856,000  
Number of businesses acquired | business         4      
Value of Quanta common stock issued         $ 161,554,000      
Consideration transferred in business acquisition         866,052,000      
Intangible assets         285,969,000      
Goodwill expected to be deductible for income tax     1,350,000,000   1,350,000,000   $ 1,350,000,000  
Revenues included in consolidated results of operations     335,700,000 613,200,000 548,200,000 757,500,000    
Income (loss) before taxes     $ 22,100,000 $ 4,100,000 $ 24,400,000 (9,700,000)    
Civil Solutions Acquisitions                
Business Combination [Line Items]                
Number of businesses acquired | business         2      
CEI                
Business Combination [Line Items]                
Number of shares granted for acquired companies (in shares) | shares   882,926            
Contingent consideration payments (up to)   $ 200,000,000.0            
Business combination, period for performance targets to be achieved (in years)   3 years            
Percentage of contingent consideration that can be paid in common stock   10.00%            
Contingent consideration, liability   $ 164,000,000.0            
Value of Quanta common stock issued   216,300,000            
Consideration transferred in business acquisition   2,040,000,000.00            
Aggregate cash consideration paid   1,650,000,000            
Cash consideration paid, net of cash acquired   $ 1,240,000,000            
Acquisition costs           $ 453,800,000    
2024 Acquisitions, Excluding CEI Acquisition                
Business Combination [Line Items]                
Cash consideration               $ 540,900,000
Number of shares granted for acquired companies (in shares) | shares               334,472
Contingent consideration, liability               $ 24,300,000
Number of businesses acquired | business               7
Value of Quanta common stock issued               $ 74,800,000