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Acquisitions - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 13, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |
Contingent consideration |  | $ 148,517 | $ 143,073 |
Goodwill |  | 12,225 | 1,411,467 |
Blattner |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable |  |  | 2,434,877 |
Value of Quanta common stock issued | $ 345,400 |  | 345,422 |
Contingent consideration |  | 134,500 | 125,632 |
Fair value of total consideration transferred or estimated to be transferred |  |  | 2,905,931 |
Cash and cash equivalents |  |  | 171,950 |
Accounts receivable |  |  | 411,835 |
Contract assets |  |  | 13,622 |
Other current assets |  |  | 57,803 |
Property and equipment |  |  | 179,530 |
Other assets |  |  | 191 |
Identifiable intangible assets |  |  | 1,425,000 |
Current maturities of long-term debt and short-term debt |  |  | (2,304) |
Accounts payable and accrued liabilities |  |  | (481,047) |
Contract liabilities |  |  | (227,040) |
Deferred tax liabilities, net |  |  | 0 |
Other long-term liabilities |  |  | (7,764) |
Total identifiable net assets |  |  | 1,541,776 |
Goodwill |  |  | 1,364,155 |
Fair value of net assets acquired |  |  | 2,905,931 |
All Others |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable |  |  | 328,155 |
Value of Quanta common stock issued |  |  | 16,922 |
Contingent consideration |  |  | 0 |
Fair value of total consideration transferred or estimated to be transferred |  |  | 345,077 |
Cash and cash equivalents |  |  | 9,911 |
Accounts receivable |  |  | 63,033 |
Contract assets |  |  | 8,322 |
Other current assets |  |  | 6,262 |
Property and equipment |  |  | 71,736 |
Other assets |  |  | 230 |
Identifiable intangible assets |  |  | 104,143 |
Current maturities of long-term debt and short-term debt |  |  | 0 |
Accounts payable and accrued liabilities |  |  | (29,481) |
Contract liabilities |  |  | (384) |
Deferred tax liabilities, net |  |  | (2,424) |
Other long-term liabilities |  |  | 0 |
Total identifiable net assets |  |  | 231,348 |
Goodwill |  |  | 113,729 |
Fair value of net assets acquired |  |  | $ 345,077 |
2020 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable |  |  |  | $ 359,600
Value of Quanta common stock issued |  |  |  | $ 57,100
Construction Contracting Services Business Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid or payable |  | 21,990 |  |
Value of Quanta common stock issued |  | 0 |  |
Contingent consideration |  | 2,600 |  |
Fair value of total consideration transferred or estimated to be transferred |  | 24,590 |  |
Cash and cash equivalents |  | 101 |  |
Accounts receivable |  | 1,755 |  |
Contract assets |  | 0 |  |
Other current assets |  | 72 |  |
Property and equipment |  | 2,266 |  |
Other assets |  | 0 |  |
Identifiable intangible assets |  | 13,109 |  |
Current maturities of long-term debt and short-term debt |  | 0 |  |
Accounts payable and accrued liabilities |  | (1,408) |  |
Contract liabilities |  | (3,530) |  |
Deferred tax liabilities, net |  | 0 |  |
Other long-term liabilities |  | 0 |  |
Total identifiable net assets |  | 12,365 |  |
Goodwill |  | 12,225 |  |
Fair value of net assets acquired |  | $ 24,590 |  |

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