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Acquisitions (2016 Acquisitions) - Additional Information (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Acquisition shares | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |
Cash paid or payable | $ 75,941 | $ 110,578
Contingent consideration | 18,683 | 1,001
Value of Quanta common stock and exchangeable shares issued | $ 1,508 | $ 10,127
Acquisitions 2016 [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 5 |
Cash paid or payable | $ 75,900 |
Contingent consideration | $ 18,700 |
Number of shares granted for acquired companies | shares | 70,840 |
Value of Quanta common stock and exchangeable shares issued | $ 1,500 |
Acquisitions 2016 [Member] | Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Contingent consideration | $ 39,500 |
Acquisitions 2016 [Member] | Electric Power Infrastructure Services Business [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 4 |
Acquisitions 2016 [Member] | Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 1 |
Acquisitions 2016 [Member] | Electric Power Infrastructure Services Business [Member] | United States [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 1 |
Acquisitions 2016 [Member] | Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 2 |
Acquisitions 2016 [Member] | Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 1 |

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