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Acquisitions - Aggregate Consideration Paid or Payable and Allocation Net Assets (Detail) - USD ($) $ in Thousands |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jul. 20, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 55,049 | $ 55,000 |  |
All Acquisitions 2018 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable | $ 105,545 |  | 105,500 |  |  |
Value of Quanta common stock issued | 22,882 |  | 22,900 |  |  |
Contingent consideration | 16,471 |  | 16,471 | 16,471 |  |
Fair value of total consideration transferred or estimated to be transferred | 144,898 |  |  |  |  |
Accounts receivable | 18,404 |  | 18,404 | 18,404 |  |
Contract assets | 1,905 |  | 1,905 | 1,905 |  |
Other current assets | 8,484 |  | 8,484 | 8,484 |  |
Property and equipment | 23,674 |  | 23,674 | 23,674 |  |
Other assets | 576 |  | 576 | 576 |  |
Identifiable intangible assets | 52,364 |  | 52,364 | 52,364 |  |
Contract liabilities | (175) |  | (175) | (175) |  |
Other current liabilities | (11,204) |  | (11,204) | (11,204) |  |
Deferred tax liabilities, net | (4,179) |  | (4,179) | (4,179) |  |
Other long-term liabilities | 0 |  | 0 | 0 |  |
Total identifiable net assets | 89,849 |  | 89,849 | 89,849 |  |
Goodwill | 55,049 |  |  |  |  |
Fair value of total consideration transferred or estimated to be transferred | 144,898 |  | 144,898 | 144,898 |  |
Stronghold |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable | 351,014 | $ 351,000 |  |  |  |
Value of Quanta common stock issued | 81,337 | 81,300 |  |  |  |
Contingent consideration |  | $ 51,100 |  |  |  | $ 51,084
Fair value of total consideration transferred or estimated to be transferred | 483,435 |  |  |  |  |
Accounts receivable | 77,478 |  | 77,478 | 77,478 |  |
Contract assets | 11,913 |  | 11,913 | 11,913 |  |
Other current assets | 20,914 |  | 20,914 | 20,914 |  |
Property and equipment | 51,258 |  | 51,258 | 51,258 |  |
Other assets | 1,513 |  | 1,513 | 1,513 |  |
Identifiable intangible assets | 95,700 |  | 95,700 | 95,700 |  |
Contract liabilities | (13,489) |  | (13,489) | (13,489) |  |
Other current liabilities | (58,346) |  | (58,346) | (58,346) |  |
Deferred tax liabilities, net | 0 |  | 0 | 0 |  |
Other long-term liabilities | (48) |  | (48) | (48) |  |
Total identifiable net assets | 186,893 |  | 186,893 | 186,893 |  |
Goodwill | 296,542 |  |  |  |  |
Fair value of total consideration transferred or estimated to be transferred | 483,435 |  | 483,435 | 483,435 |  |
Acquisitions 2017, other than Stronghold |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable | 11,955 |  |  |  | $ 12,000 |
Value of Quanta common stock issued | 8,267 |  |  |  | $ 8,300 |
Contingent consideration | 0 |  | 0 | 0 |  |
Fair value of total consideration transferred or estimated to be transferred | 20,222 |  |  |  |  |
Accounts receivable | 7,157 |  | 7,157 | 7,157 |  |
Contract assets | 193 |  | 193 | 193 |  |
Other current assets | 170 |  | 170 | 170 |  |
Property and equipment | 1,480 |  | 1,480 | 1,480 |  |
Other assets | 12 |  | 12 | 12 |  |
Identifiable intangible assets | 8,091 |  | 8,091 | 8,091 |  |
Contract liabilities | (93) |  | (93) | (93) |  |
Other current liabilities | (2,705) |  | (2,705) | (2,705) |  |
Deferred tax liabilities, net | 0 |  | 0 | 0 |  |
Other long-term liabilities | 0 |  | 0 | 0 |  |
Total identifiable net assets | 14,305 |  | 14,305 | 14,305 |  |
Goodwill | 5,917 |  |  |  |  |
Fair value of total consideration transferred or estimated to be transferred | $ 20,222 |  | $ 20,222 | $ 20,222 |  |

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