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Acquisitions (Detail) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 20, 2017 USD ($) shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Acquisition shares | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) Acquisition shares
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration, maximum |  | $ 139,500 |  | $ 139,500 |  | $ 139,500 |
Net tangible assets acquired |  |  |  |  |  | 97,400 |
Other intangible assets acquired |  |  |  |  |  | 103,800 |
Goodwill acquired |  |  |  | 311,403 |  | 311,400 |
Revenues included in consolidated results of operations |  | 2,609,307 | $ 2,042,186 | 6,987,851 | $ 5,548,353 |  |
Loss (income) before taxes |  | (132,195) | $ (128,063) | (307,832) | $ (193,789) |  |
Electric Power Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  | 5,866 |  |  |
Oil and Gas Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  | 305,537 |  |  |
Stronghold, Ltd. and Stronghold Specialty, Ltd. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Aggregate consideration paid | $ 360,000 |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) | shares | 2,693,680 |  |  |  |  |  |
Value of Quanta common stock issued | $ 81,337 |  |  |  |  |  |
Contingent consideration, maximum | $ 100,000 |  |  |  |  |  |
Contingent consideration financial target term | 3 years |  |  |  |  |  |
Contingent consideration, liability | $ 51,084 |  |  |  |  |  |
Cash paid or payable | 360,009 |  |  |  |  |  |
Goodwill acquired | $ 305,537 |  |  |  |  |  |
Stronghold, Ltd. and Stronghold Specialty, Ltd. | Oil and Gas Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 305,500 |  |  |
Acquisitions 2017, other than Stronghold |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) | shares |  |  |  | 288,666 |  |  |
Value of Quanta common stock issued |  |  |  | $ 8,267 |  |  |
Contingent consideration, liability |  | 0 |  | $ 0 |  | 0 |
Number of business acquisitions | Acquisition |  |  |  | 2 |  |  |
Cash paid or payable |  |  |  | $ 11,904 |  |  |
Goodwill acquired |  |  |  | 5,866 |  |  |
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 |  | 311,400 |  | 311,400 |  | $ 311,400 |
Revenues included in consolidated results of operations |  | 87,200 |  | 89,400 |  |  |
Loss (income) before taxes |  | 6,400 |  | 8,200 |  |  |
Acquisition costs |  | $ 3,200 |  | $ 5,400 |  |  |
Acquisitions 2016 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
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, liability |  |  |  |  |  |  | $ 18,683
Number of business acquisitions | Acquisition |  |  |  |  |  |  | 5
Cash paid or payable |  |  |  |  |  |  | $ 75,941
Goodwill acquired |  |  |  |  |  |  | 43,923
Goodwill expected to be deductible for income tax |  |  |  |  |  |  | $ 2,000
Acquisitions 2016 | Electric Power Infrastructure Services Segment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of business acquisitions | Acquisition |  |  |  |  |  |  | 4
Acquisitions 2016 | Electric Power Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  | $ 23,600
Acquisitions 2016 | Oil and Gas Infrastructure Services Division |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  | $ 20,300

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