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Acquisitions - 2017 Acquisitions (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 20, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |
Contingent consideration, maximum |  | $ 139,500 |  |
Contingent consideration |  | 51,100 | $ 18,700 | $ 1,000
Goodwill acquired |  | 302,408 | $ 45,186 |
Stronghold |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable | $ 351,014 |  |  |
Number of shares granted for acquired companies (in 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 | $ 51,084 |  |  |
Goodwill acquired | $ 296,542 |  |  |
Acquisitions 2017, other than Stronghold |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable |  | $ 11,904 |  |
Number of shares granted for acquired companies (in shares) |  | 288,666 |  |
Value of Quanta common stock issued |  | $ 8,267 |  |
Contingent consideration |  | 0 |  |
Goodwill acquired |  | 5,866 |  |
Acquisitions 2017 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net tangible assets acquired |  | 97,400 |  |
Other intangible assets acquired |  | 103,800 |  |
Goodwill acquired |  | $ 302,400 |  |

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