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Acquisitions (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) shares | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) Acquisition shares
Business Acquisition [Line Items] |  |  |  |  |  |
Net tangible assets acquired |  |  |  |  | $ 22,900 |
Goodwill acquired |  |  | $ 1,484 |  | 19,200 |
Other intangible assets acquired |  |  |  |  | 10,200 |
Revenues included in consolidated results of operations | $ 2,200,374 | $ 1,792,430 | 4,378,544 | $ 3,506,167 |  |
Loss (income) before taxes | (104,605) | $ (31,424) | (175,637) | $ (65,726) |  |
Electric Power Infrastructure Services Division |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  | 1,484 |  |  |
Oil and Gas Infrastructure Services Division |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  | 0 |  |  |
Acquisitions 2017 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable | $ 5,600 |  | 5,554 |  |  |
Number of shares granted for acquired companies (in shares) | shares | 288,666 |  |  |  |  |
Value of Quanta common stock issued | $ 8,300 |  | 8,267 |  |  |
Contingent consideration, liability | 0 |  | 0 |  | 0 |
Goodwill acquired |  |  | 1,484 |  |  |
Fair value of accounts receivable acquired | 6,300 |  | 6,300 |  | 6,300 |
Goodwill expected to be deductible for income tax | 1,500 |  | 1,500 |  | $ 1,500 |
Revenues included in consolidated results of operations | 2,200 |  | 2,200 |  |  |
Loss (income) before taxes | 1,800 |  | 1,800 |  |  |
Acquisition costs | $ 2,300 |  | 2,300 |  |  |
Acquisitions 2017 | Electric Power Infrastructure Services Division |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill acquired |  |  | $ 1,500 |  |  |
Acquisitions 2016 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
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
Number of business acquisitions | Acquisition |  |  |  |  |  | 5
Contingent consideration, maximum |  |  |  |  |  | $ 39,500
Contingent consideration, liability |  |  |  |  |  | 18,683
Goodwill acquired |  |  |  |  |  | 43,923
Fair value of accounts receivable acquired |  |  |  |  |  | 14,400
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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