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Commitments and Contingencies (Concentrations of Credit Risk) - Additional Information (Detail) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) Customer | Mar. 31, 2017 USD ($) Customer
Concentration Risk [Line Items] |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | $ 473,308 | $ 556,527
Customer Concentration Risk [Member] |  |
Concentration Risk [Line Items] |  |
Net position balance | $ 277,300 | $ 300,400
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% | 16.00%
Costs and estimated earnings in excess of billings on uncompleted contracts | $ 175,900 | $ 191,100
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Oil and Gas Infrastructure Services Segment [Member] |  |
Concentration Risk [Line Items] |  |
Number of customers representing ten percent or more of concentration risk | Customer |  | 2

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