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Acquisitions - 2016 Acquisitions (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) Acquisition shares | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |
Contingent consideration, maximum |  | $ 139,500 |
Contingent consideration | $ 18,700 | $ 51,100 | $ 1,000
Acquisitions 2016 |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Acquisition | 5 |  |
Cash paid or payable | $ 75,941 |  |
Number of shares granted for acquired companies (in shares) | shares | 70,840 |  |
Value of Quanta common stock issued | $ 1,508 |  |
Contingent consideration, maximum | 39,500 |  |
Contingent consideration | $ 18,683 |  |
Acquisitions 2016 | Electric Power Infrastructure Services Business |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Acquisition | 4 |  |

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