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Employee Benefit Plans - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Percent of employees covered by collective bargaining agreements | 32.00% |  |  |
Contributions |  | $ 183,756,000 | $ 149,764,000 | $ 167,399,000
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 |  | $ 93,900,000 | 75,900,000 | 61,700,000
Contributions to the deferred compensation plans |  | 2,300,000 | 1,800,000 | 1,500,000
Discretionary contributions |  | 0 | 0 | 0
Deferred compensation obligations included in other long-term liabilities | $ 110,200,000 | $ 110,200,000 | $ 88,900,000 |
Deferred compensation arrangement with individual, common stock reserved for future issuance (in shares) | 154,991 | 154,991 | 174,079 |
Investments in company-owned life insurance policies | $ 102,700,000 | $ 102,700,000 | $ 83,400,000 |
Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Percentage of employee contribution |  | 3.00% |  |
Maximum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Percentage of employee contribution |  | 6.00% |  |
Multiemployer Defined Contribution and Other Benefit Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contributions |  | $ 282,500,000 | $ 254,700,000 | $ 234,300,000

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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent of Match By Employer Of Each Employee Who Contributes To Plan + References No definition available. + Details
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