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Acquisitions (2014 Acquisitions) - Additional Information (Detail) - Acquisitions 2014 [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2014 USD ($) Entity shares
Business Acquisition [Line Items] |
Number of business acquisitions | 9
Cash paid or payable | $ | $ 279.5
Value of Quanta common stock and exchangeable shares issued | $ | $ 134.5
Common Stock [Member] |
Business Acquisition [Line Items] |
Number of shares granted for acquired companies | shares | 686,382
Canadian Subsidiaries [Member] | Exchangeable Shares [Member] |
Business Acquisition [Line Items] |
Number of shares granted for acquired companies | shares | 3,825,971
Series G Preferred Stock [Member] |
Business Acquisition [Line Items] |
Number of shares granted for acquired companies | shares | 1
Series G Preferred Stock [Member] | Canadian Subsidiaries [Member] | Exchangeable Shares [Member] |
Business Acquisition [Line Items] |
Number of shares granted for acquired companies | shares | 899,858
Electric Power Infrastructure Services Business [Member] | United States [Member] |
Business Acquisition [Line Items] |
Number of business acquisitions | 1
Electric Power Infrastructure Services Business [Member] | Australia [Member] |
Business Acquisition [Line Items] |
Number of business acquisitions | 1
Electric Power Infrastructure Services Business [Member] | Canada [Member] |
Business Acquisition [Line Items] |
Number of business acquisitions | 4
Oil and Gas Infrastructure Services Business [Member] | United States [Member] |
Business Acquisition [Line Items] |
Number of business acquisitions | 1
Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |
Business Acquisition [Line Items] |
Number of business acquisitions | 2

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