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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Percent of employees covered by collective bargaining agreements | 34.00% |  |
Contributions | $ 121,978 | $ 134,197 | $ 126,191
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 | $ 45,900 | 41,400 | 33,400
Contributions to the deferred compensation plans | 1,300 | 1,100 | 1,100
Discretionary contributions | 0 | 0 | 0
Deferred compensation obligations included in other long-term liabilities | 58,200 | 47,300 |
Investments in company-owned life insurance policies | $ 56,500 | 45,800 |
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 | $ 188,600 | $ 201,300 | $ 174,700

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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent of Match By Employer Up To Specific Percentage + References No definition available. + Details
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