v3.25.4
ACQUISITIONS - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 25, 2025
Jul. 17, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Business Combination [Line Items]          
Contingent consideration     $ 593,829 $ 344,984  
Goodwill     7,317,228 5,316,443 $ 4,045,905
Dynamic Systems, LLC          
Business Combination [Line Items]          
Cash paid or payable $ 1,260,000   1,264,009    
Value of Quanta common stock issued     218,756    
Contingent consideration     190,561    
Fair value of total consideration transferred or estimated to be transferred     1,673,326    
Cash and cash equivalents     66,696    
Accounts receivable     279,720    
Contract assets     9,859    
Inventories     1,955    
Prepaid expenses and other current assets     1,303    
Property and equipment     30,398    
Operating lease right-of-use assets     19,281    
Other assets     9,767    
Identifiable intangible assets     532,400    
Current portion of operating lease liabilities     (4,850)    
Accounts payable and accrued expenses     (97,541)    
Contract liabilities     (145,553)    
Operating lease liabilities, net of current portion     (14,431)    
Deferred income taxes     0    
Insurance and other non-current liabilities     0    
Non-controlling interests     0    
Total identifiable net assets     689,004    
Goodwill     984,322    
Fair value of net assets acquired     1,673,326    
2025 Acquisitions, Excluding Dynamic Systems          
Business Combination [Line Items]          
Cash paid or payable     1,997,842    
Value of Quanta common stock issued     284,478    
Contingent consideration     188,737    
Fair value of total consideration transferred or estimated to be transferred     2,471,057    
Cash and cash equivalents     125,040    
Accounts receivable     608,139    
Contract assets     62,415    
Inventories     3,479    
Prepaid expenses and other current assets     23,054    
Property and equipment     237,197    
Operating lease right-of-use assets     21,987    
Other assets     2,395    
Identifiable intangible assets     1,010,069    
Current portion of operating lease liabilities     (4,605)    
Accounts payable and accrued expenses     (275,879)    
Contract liabilities     (140,618)    
Operating lease liabilities, net of current portion     (17,385)    
Deferred income taxes     (81,443)    
Insurance and other non-current liabilities     (11,983)    
Non-controlling interests     (84,379)    
Total identifiable net assets     1,477,483    
Goodwill     993,574    
Fair value of net assets acquired     $ 2,471,057    
CEI          
Business Combination [Line Items]          
Cash paid or payable       1,654,967  
Value of Quanta common stock issued   $ 216,300   216,264  
Contingent consideration       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  
Identifiable intangible assets       669,000  
Current portion of operating lease liabilities       (10,665)  
Accounts payable and accrued expenses       (315,436)  
Contract liabilities       (222,538)  
Operating lease liabilities, net of current portion       (19,448)  
Deferred income taxes       (15,936)  
Insurance and other non-current liabilities       (11,011)  
Non-controlling interests       0  
Total identifiable net assets       1,040,144  
Goodwill       995,086  
Fair value of net assets acquired       2,035,230  
2024 Acquisitions, Excluding CEI          
Business Combination [Line Items]          
Cash paid or payable       540,882  
Value of Quanta common stock issued       74,797  
Contingent consideration       24,266  
Fair value of total consideration transferred or estimated to be transferred       639,945  
Cash and cash equivalents       31,403  
Accounts receivable       72,263  
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       616  
Identifiable intangible assets       211,042  
Current portion of operating lease liabilities       (4,908)  
Accounts payable and accrued expenses       (72,885)  
Contract liabilities       (28,434)  
Operating lease liabilities, net of current portion       (20,524)  
Deferred income taxes       (48,646)  
Insurance and other non-current liabilities       (9,744)  
Non-controlling interests       0  
Total identifiable net assets       315,621  
Goodwill       324,324  
Fair value of net assets acquired       $ 639,945