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Acquisitions (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jul. 20, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Potential payment (up to) | $ 157,300 |  | $ 157,300 | $ 157,300 | $ 157,300 |  |
Net tangible assets acquired |  |  |  |  | 37,500 |  |
Other intangible assets acquired |  |  |  |  | 52,400 |  |
Goodwill acquired |  |  |  | 55,049 | 55,000 |  |
Electric Power Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  | 55,049 |  |  |
Oil and Gas Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  | 0 |  |  |
Acquisitions 2018 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | 105,545 |  |  | $ 105,500 |  |  |
Number of shares granted for acquired companies (in shares) |  |  |  | 679,668 |  |  |
Value of Quanta common stock issued | 22,882 |  |  | $ 22,900 |  |  |
Potential payment (up to) | 18,000 |  | 18,000 | 18,000 | 18,000 |  |
Fair value of contingent consideration liability | 16,471 |  | 16,471 | 16,471 | 16,471 |  |
Other intangible assets acquired |  |  |  | 52,364 |  |  |
Goodwill acquired | 55,049 |  |  |  |  |  |
Goodwill expected to be deductible for income tax | 21,600 |  | 21,600 | 21,600 | 21,600 |  |
Revenues included in consolidated results of operations |  |  | 12,900 | 32,200 |  |  |
Income (loss) before taxes |  |  | (5,100) | (11,700) |  |  |
Acquisition costs |  |  | 5,000 | $ 11,000 |  |  |
Acquisitions 2018 | Minimum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration financial target term |  |  |  | 3 years |  |  |
Acquisitions 2018 | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration financial target term |  |  |  | 5 years |  |  |
Acquisitions 2018 | Electric Power Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 55,000 |  |  |
Stronghold, Ltd. and Stronghold Specialty, Ltd. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | 351,014 | $ 351,000 |  |  |  |  |
Number of shares granted for acquired companies (in shares) |  | 2,693,680 |  |  |  |  |
Value of Quanta common stock issued | 81,337 | $ 81,300 |  |  |  |  |
Potential payment (up to) |  | $ 100,000 |  |  |  |  |
Contingent consideration financial target term |  | 3 years |  |  |  |  |
Fair value of contingent consideration liability |  | $ 51,100 |  |  |  |  | $ 51,084
Goodwill acquired | 296,542 |  |  |  |  |  |
Stronghold, Ltd. and Stronghold Specialty, Ltd. | Oil and Gas Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | $ 296,500 |
Acquisitions 2017, other than Stronghold |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | 11,955 |  |  |  |  | $ 12,000 |
Number of shares granted for acquired companies (in shares) |  |  |  |  |  | 288,666 |
Value of Quanta common stock issued | 8,267 |  |  |  |  | $ 8,300 |
Fair value of contingent consideration liability | 0 |  | $ 0 | $ 0 | $ 0 |  |
Goodwill acquired | $ 5,917 |  |  |  |  |  |
Acquisitions 2017, other than Stronghold | Electric Power Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | 5,900 |
Acquisitions 2017 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill expected to be deductible for income tax |  |  |  |  |  | $ 302,500 |

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