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Acquisitions - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 35,300 |
Acquisitions 2021 |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid or payable | $ 59,226 |  |
Value of Quanta common stock issued | 2,479 |  |
Contingent consideration | 0 | 0 |
Fair value of total consideration transferred or estimated to be transferred | 61,705 |  |
Accounts receivable | 10,678 | 10,678 |
Contract assets | 2,048 | 2,048 |
Other current assets | 7,189 | 7,189 |
Property and equipment | 5,651 | 5,651 |
Other assets | 216 | 216 |
Identifiable intangible assets | 18,506 | 18,506 |
Contract liabilities | (16) | (16) |
Other current liabilities | (10,371) | (10,371) |
Deferred tax liabilities, net | (2,093) | (2,093) |
Total identifiable net assets | 31,808 | 31,808 |
Goodwill | 29,897 |  |
Fair value of net assets acquired | $ 61,705 | $ 61,705 |
Acquisitions 2020 |  |  |
Business Acquisition [Line Items] |  |  |
Cash paid or payable |  |  | $ 359,624
Value of Quanta common stock issued |  |  | 57,119
Contingent consideration |  |  | 2,250
Fair value of total consideration transferred or estimated to be transferred |  |  | 418,993
Accounts receivable |  |  | 74,492
Contract assets |  |  | 8,919
Other current assets |  |  | 53,302
Property and equipment |  |  | 143,276
Other assets |  |  | 14
Identifiable intangible assets |  |  | 96,827
Contract liabilities |  |  | (3,750)
Other current liabilities |  |  | (35,112)
Deferred tax liabilities, net |  |  | (3,185)
Total identifiable net assets |  |  | 334,783
Goodwill |  |  | 84,210
Fair value of net assets acquired |  |  | $ 418,993

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