v3.25.2
Acquisitions - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 25, 2025
USD ($)
Jul. 17, 2024
USD ($)
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
business
shares
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
business
shares
Business Combination [Line Items]                
Contingent consideration, liability     $ 256,202   $ 256,202   $ 256,202 $ 344,984
Cash consideration paid, net of cash acquired         586,102 $ 450,798    
Intangible assets         285,969      
Cash payments for contingent consideration liabilities         $ 106,800 0    
Stock issued as payment for contingent consideration liabilities (in shares) | shares         158,040      
Acquisition costs     6,600 $ 4,300 $ 13,100 10,200    
Dynamic Systems, LLC | Subsequent Event                
Business Combination [Line Items]                
Consideration transferred in business acquisition $ 1,350,000              
Common stock consideration transferred in business acquisition 200,000              
Contingent consideration payments (up to) $ 216,000              
Business combination, period for performance targets to be achieved (in years) 2 years              
Acquisitions, Multiple Periods                
Business Combination [Line Items]                
Contingent consideration payments (up to)     396,900   396,900   396,900  
Net tangible assets acquired             605,700  
Intangible assets             985,700  
Goodwill, acquired during period             1,360,000  
Business Acquisitions                
Business Combination [Line Items]                
Consideration transferred in business acquisition         815,684      
Contingent consideration payments (up to)     127,900   $ 127,900   127,900  
Business combination, period for performance targets to be achieved (in years)         3 years      
Number of businesses acquired | business         4      
Cash consideration         $ 599,252      
Number of shares granted for acquired companies (in shares) | shares         515,822      
Value of Quanta common stock issued         $ 161,554      
Contingent consideration, liability     54,878   54,878   54,878  
Goodwill expected to be deductible for income tax     323,200   323,200   $ 323,200  
Revenues included in consolidated results of operations     115,600 76,600 212,500 144,300    
Income (loss) before taxes     $ 3,000 $ (4,700) $ 2,300 $ (13,800)    
Civil Solutions Acquisitions                
Business Combination [Line Items]                
Number of businesses acquired | business         2      
CEI                
Business Combination [Line Items]                
Consideration transferred in business acquisition   $ 2,040,000            
Contingent consideration payments (up to)   $ 200,000            
Business combination, period for performance targets to be achieved (in years)   3 years            
Number of shares granted for acquired companies (in shares) | shares   882,926            
Value of Quanta common stock issued   $ 216,300            
Contingent consideration, liability   164,000            
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 Combination [Line Items]                
Number of businesses acquired | business               7
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