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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 20, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 311,403 | $ 311,400 |
Stronghold |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable | $ 360,009 |  |  |
Value of Quanta common stock issued | 81,337 |  |  |
Contingent consideration | 51,084 |  |  |
Fair value of total consideration transferred or estimated to be transferred | 492,430 |  |  |
Accounts receivable | 77,478 |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 22,496 |  |  |
Other current assets | 20,914 |  |  |
Property and equipment | 51,258 |  |  |
Other assets | 1,513 |  |  |
Identifiable intangible assets | 95,700 |  |  |
Current liabilities | (82,418) |  |  |
Deferred tax liabilities, net | 0 |  |  |
Other long-term liabilities | (48) |  |  |
Total identifiable net assets | 186,893 |  |  |
Goodwill | 305,537 |  |  |
Fair value of total consideration transferred or estimated to be transferred | $ 492,430 |  |  |
Acquisitions 2017, other than Stronghold |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable |  | 11,904 |  |
Value of Quanta common stock issued |  | 8,267 |  |
Contingent consideration |  | 0 | 0 |
Fair value of total consideration transferred or estimated to be transferred |  | 20,171 |  |
Accounts receivable |  | 7,157 | 7,157 |
Costs and estimated earnings in excess of billings on uncompleted contracts |  | 193 | 193 |
Other current assets |  | 170 | 170 |
Property and equipment |  | 1,480 | 1,480 |
Other assets |  | 12 | 12 |
Identifiable intangible assets |  | 8,091 | 8,091 |
Current liabilities |  | (2,798) | (2,798) |
Deferred tax liabilities, net |  | 0 | 0 |
Other long-term liabilities |  | 0 | 0 |
Total identifiable net assets |  | 14,305 | 14,305 |
Goodwill |  | 5,866 |  |
Fair value of total consideration transferred or estimated to be transferred |  | $ 20,171 | $ 20,171 |
Acquisitions 2016 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable |  |  |  | $ 75,941
Value of Quanta common stock issued |  |  |  | 1,508
Contingent consideration |  |  |  | 18,683
Fair value of total consideration transferred or estimated to be transferred |  |  |  | 96,132
Accounts receivable |  |  |  | 14,414
Costs and estimated earnings in excess of billings on uncompleted contracts |  |  |  | 1,237
Other current assets |  |  |  | 8,582
Property and equipment |  |  |  | 44,863
Other assets |  |  |  | 2,553
Identifiable intangible assets |  |  |  | 11,467
Current liabilities |  |  |  | (12,097)
Deferred tax liabilities, net |  |  |  | (13,484)
Other long-term liabilities |  |  |  | (5,326)
Total identifiable net assets |  |  |  | 52,209
Goodwill |  |  |  | 43,923
Fair value of total consideration transferred or estimated to be transferred |  |  |  | $ 96,132

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