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Commitments and Contingencies (Concentrations of Credit Risk) - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 Customer
Concentration Risk [Line Items] |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | $ 473,308 | $ 317,745 |
Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Net position balance | $ 277,300 | $ 195,200 |
Net Receivable Position [Member] | Customer Concentration Risk [Member] | Quanta's Electric Power Infrastructure Services Segment [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers representing ten percent or more of concentration risk | Customer | 1 | 1 |
Concentration risk percentage | 16.00% | 12.00% |
Costs and estimated earnings in excess of billings on uncompleted contracts | $ 175,900 | $ 83,900 |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers representing ten percent or more of concentration risk | Customer | 0 | 0 | 0

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