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Acquisitions (2015 Acquisitions) - Additional Information (Detail) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) Entity shares
Business Acquisition [Line Items] |  |
Aggregate consideration for acquisitions | $ | $ 42,211 | $ 110,428
Value of Quanta common stock and exchangeable shares issued | $ |  | 10,127
Contingent consideration | $ | $ 15,400 | 1,001
Acquisitions 2015 [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate consideration for acquisitions | $ |  | $ 110,400
Number of shares granted for acquired companies | shares |  | 461,037
Value of Quanta common stock and exchangeable shares issued | $ |  | $ 10,100
Contingent consideration | $ |  | $ 1,000
Number of business acquisitions |  | 11
Acquisitions 2015 [Member] | Electric Power Infrastructure Services Business [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 8
Acquisitions 2015 [Member] | Electric Power Infrastructure Services Business [Member] | United States [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 4
Acquisitions 2015 [Member] | Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 1
Acquisitions 2015 [Member] | Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 3
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Services Business [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 3
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 1
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Services Business [Member] | Australia [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 1
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 1

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