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Acquisitions - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 17, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]        
Contingent consideration   $ 344,984 $ 157,073  
Goodwill   5,316,443 4,045,905 $ 3,586,745
CEI        
Business Acquisition [Line Items]        
Cash paid or payable   1,654,967    
Value of Quanta common stock issued $ 216,300 216,264    
Contingent consideration 164,000 163,999    
Fair value of total consideration transferred or estimated to be transferred $ 2,040,000 2,035,230    
Cash and cash equivalents   414,705    
Accounts receivable   339,254    
Contract assets   92,160    
Inventories   0    
Prepaid expenses and other current assets   23,233    
Property and equipment   32,207    
Operating lease right-of-use assets   28,906    
Other assets   35,713    
Other intangible assets   669,000    
Current portion of operating lease liabilities   (10,665)    
Accounts payable and accrued expenses   (315,435)    
Contract liabilities   (222,538)    
Operating lease liabilities, net of current portion   (19,449)    
Deferred income taxes   (9,385)    
Insurance and other non-current liabilities   (10,300)    
Total identifiable net assets   1,047,406    
Goodwill   987,824    
Fair value of net assets acquired   2,035,230    
All Others        
Business Acquisition [Line Items]        
Cash paid or payable   540,064    
Value of Quanta common stock issued   74,797    
Contingent consideration   24,266    
Fair value of total consideration transferred or estimated to be transferred   639,127    
Cash and cash equivalents   31,403    
Accounts receivable   73,390    
Contract assets   8,995    
Inventories   46,345    
Prepaid expenses and other current assets   12,455    
Property and equipment   92,214    
Operating lease right-of-use assets   25,429    
Other assets   617    
Other intangible assets   211,042    
Current portion of operating lease liabilities   (4,907)    
Accounts payable and accrued expenses   (75,800)    
Contract liabilities   (28,434)    
Operating lease liabilities, net of current portion   (20,522)    
Deferred income taxes   (48,646)    
Insurance and other non-current liabilities   (9,744)    
Total identifiable net assets   313,837    
Goodwill   325,290    
Fair value of net assets acquired   $ 639,127    
Acquisitions 2023        
Business Acquisition [Line Items]        
Cash paid or payable     780,773  
Value of Quanta common stock issued     158,922  
Contingent consideration     0  
Fair value of total consideration transferred or estimated to be transferred     939,695  
Cash and cash equivalents     123,891  
Accounts receivable     92,817  
Contract assets     17,200  
Inventories     74,872  
Prepaid expenses and other current assets     5,830  
Property and equipment     200,738  
Operating lease right-of-use assets     16,264  
Other assets     4,553  
Other intangible assets     192,915  
Current portion of operating lease liabilities     (3,080)  
Accounts payable and accrued expenses     (88,227)  
Contract liabilities     (102,752)  
Operating lease liabilities, net of current portion     (13,790)  
Deferred income taxes     (21,489)  
Insurance and other non-current liabilities     (2,682)  
Total identifiable net assets     497,060  
Goodwill     442,635  
Fair value of net assets acquired     $ 939,695