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Acquisitions (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Jul. 20, 2017 | Jan. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration, maximum | $ 154,600 |  |  |  | $ 154,600 |  | $ 154,600 |
Net tangible assets acquired |  |  |  |  |  |  | 102,400 |
Other intangible assets acquired |  |  |  |  |  |  | 123,600 |
Goodwill acquired |  |  |  |  | 41,709 |  | 344,100 |
Revenues included in consolidated results of operations |  |  |  |  | 2,417,576 | $ 2,178,170 |  |
Income (loss) before taxes |  |  |  |  | 56,614 | $ 71,032 |  |
Electric Power Infrastructure Services Division |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | 41,709 |  |  |
Oil and Gas Infrastructure Services Division |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | 0 |  |  |
Acquisitions 2018 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid or payable | 39,291 |  |  |  | 39,300 |  |  |
Number of shares granted for acquired companies (in shares) |  |  | 379,817 |  |  |  |  |
Value of Quanta common stock issued | 13,549 |  | $ 13,500 |  |  |  |  |
Contingent consideration, maximum |  |  | $ 15,000 |  |  |  |  |
Contingent consideration financial target term |  |  | 5 years |  |  |  |  |
Contingent consideration, liability | 13,705 |  |  |  | 13,705 |  | 13,705 |
Other intangible assets acquired |  |  |  |  | 19,836 |  |  |
Goodwill acquired | 41,709 |  |  |  |  |  |  |
Goodwill expected to be deductible for income tax | 9,800 |  |  |  | 9,800 |  | 9,800 |
Revenues included in consolidated results of operations |  |  |  |  | 8,100 |  |  |
Income (loss) before taxes |  |  |  |  | (5,300) |  |  |
Acquisition costs |  |  |  |  | 5,600 |  |  |
Acquisitions 2018 | Electric Power Infrastructure Services Division |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | 41,700 |  |  |
Stronghold, Ltd. and Stronghold Specialty, Ltd. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid or payable | 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 |  |  |  |  |  |
Contingent consideration, maximum |  | $ 100,000 |  |  |  |  |  |
Contingent consideration financial target term |  | 3 years |  |  |  |  |  |
Contingent consideration, liability | 51,084 | $ 51,100 |  |  | 51,084 |  | 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 paid or payable | 11,904 |  |  |  |  |  |  | $ 11,900
Number of shares granted for acquired companies (in shares) |  |  |  |  |  |  |  | 288,666
Value of Quanta common stock issued | 8,267 |  |  |  |  |  |  | $ 8,300
Contingent consideration, liability | 0 |  |  |  | $ 0 |  | $ 0 |
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 |  |  |  |  |  |  |  | $ 302,400
Scenario, Forecast | Acquisitions 2018 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash paid or payable |  |  |  | $ 12,200 |  |  |  |

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