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Employee Benefit Plans - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Percent of employees covered by collective bargaining agreements 32.00%      
Contributions   $ 149,764,000 $ 167,399,000 $ 132,996,000
Percentage of contribution by employer of each employee's contribution up to 3%   100.00%    
Percentage of contribution by employer of each employee who contributes between 3% and 6%   50.00%    
Contributions to Quanta 401(k) Plan   $ 75,900,000 61,700,000 50,700,000
Contributions to the deferred compensation plans   1,800,000 1,500,000 1,400,000
Discretionary contributions   0 0 0
Deferred compensation obligations included in other long-term liabilities $ 88,900,000 $ 88,900,000 $ 67,400,000  
Deferred compensation arrangement with individual, common stock reserved for future issuance (in shares) 174,079 174,079 252,026  
Investments in company-owned life insurance policies $ 83,400,000 $ 83,400,000 $ 64,000,000  
Minimum        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Percentage of employee contribution, lower range   3.00%    
Maximum        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Percentage of employee contribution, lower range   6.00%    
Multiemployer Defined Contribution and Other Benefit Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Contributions   $ 254,700,000 $ 234,300,000 $ 213,400,000