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Acquisitions - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Goodwill | $ 86,197 | $ 110,383 | $ 56,337
2020 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid or payable | 351,671 |  |
Value of Quanta common stock issued | 57,119 |  |
Contingent consideration | 2,250 |  |
Fair value of total consideration transferred or estimated to be transferred | 411,040 |  |
Accounts receivable | 74,848 |  |
Contract assets | 8,919 |  |
Other current assets | 51,836 |  |
Property and equipment | 133,065 |  |
Other assets | 14 |  |
Identifiable intangible assets | 96,826 |  |
Contract liabilities | (10,324) |  |
Other current liabilities | (27,156) |  |
Deferred tax liabilities, net | (3,185) |  |
Other long-term liabilities | 0 |  |
Total identifiable net assets | 324,843 |  |
Goodwill | 86,197 |  |
Fair value of net assets acquired | 411,040 |  |
Bargain purchase gain | $ 0 |  |
2019 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid or payable |  | 395,258 |
Value of Quanta common stock issued |  | 1,791 |
Contingent consideration |  | 0 |
Fair value of total consideration transferred or estimated to be transferred |  | 397,049 |
Accounts receivable |  | 112,142 |
Contract assets |  | 11,869 |
Other current assets |  | 14,290 |
Property and equipment |  | 60,133 |
Other assets |  | 149 |
Identifiable intangible assets |  | 192,786 |
Contract liabilities |  | (11,856) |
Other current liabilities |  | (73,698) |
Deferred tax liabilities, net |  | (12,414) |
Other long-term liabilities |  | (5,345) |
Total identifiable net assets |  | 288,056 |
Goodwill |  | 112,132 |
Fair value of net assets acquired |  | 400,188 |
Bargain purchase gain |  | $ (3,139) |

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