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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Employee Benefit Plans [Line Items] |  |  |
Multiemployer defined contribution and other benefit plan contributions other than MEP DBP | $ 139.3 | $ 147.1 | $ 129.0
Contributions to the deferred compensation plans | 1.0 | 1.0 | 0.3
Deferred compensation obligations included in other long-term liabilities | 19.1 | 11.7 |
Deferred compensation obligations included in other long-term assets | $ 17.9 | 11.3 |
401K Plan [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
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 three and six percent | 50.00% |  |
Percentage of employee contribution, lower range | 3.00% |  |
Percentage of employee contribution, high range | 6.00% |  |
Contributions to Quanta 401(k) Plan | $ 21.9 | $ 17.7 | $ 13.9
Red Zone [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Percentage Funded in this Zone | Less than 65 % |  |
Yellow Zone [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Percentage Funded in this Zone | Less than 80 % |  |
Green Zone [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Percentage Funded in this Zone | at least 80 % |  |

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- Definition Employee Benefit Plans [Line Items] + References No definition available. + Details
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- Definition Multiemployer defined contribution plan period contributions. + References No definition available. + Details
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