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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 13, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Net tangible assets acquired |  |  | $ 136,400 |  | $ 136,400 |  | $ 136,400 |
Identified intangible assets |  |  |  |  |  |  | 37,600 |
Goodwill acquired |  |  |  |  |  |  | 35,300 |
Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Post-acquisition period, financial performance objectives | 3 years |  |  |  |  |  |  |
Acquisitions 2021 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of total consideration transferred or estimated to be transferred |  |  |  |  | $ 61,705 |  |  |
Number of shares granted for acquired companies (in shares) |  |  |  |  | 32,822 |  |  |
Value of quanta common stock issued |  |  |  |  | $ 2,479 |  |  |
Contingent consideration |  |  | 0 |  | 0 |  | 0 |
Identified intangible assets |  |  |  |  | 18,506 |  |  |
Goodwill acquired |  |  |  |  | 29,897 |  |  |
Goodwill expected to be deductible for income tax |  |  | 13,300 |  | 13,300 |  | $ 13,300 |
Revenues included in consolidated results of operations |  |  | 13,400 |  | 14,600 |  |  |
Income (loss) before taxes |  |  | (300) |  | (200) |  |  |
Acquisition costs |  |  | $ 2,000 |  | 2,400 |  |  |
Cash consideration |  |  |  |  | $ 59,226 |  |  |
Acquisitions 2020 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of total consideration transferred or estimated to be transferred |  |  |  |  |  |  |  | $ 418,993
Number of shares granted for acquired companies (in shares) |  |  |  |  |  |  |  | 1,334,469
Value of quanta common stock issued |  |  |  |  |  |  |  | $ 57,119
Aggregate maximum payout amount |  |  |  |  |  |  |  | $ 6,900
Aggregate maximum payout amount, target term |  |  |  |  |  |  |  | 5 years
Contingent consideration |  |  |  |  |  |  |  | $ 2,250
Goodwill acquired |  |  |  |  |  |  |  | 84,210
Goodwill expected to be deductible for income tax |  |  |  |  |  |  |  | 72,600
Revenues included in consolidated results of operations |  |  |  | $ 55,200 |  | $ 63,000 |  |
Income (loss) before taxes |  |  |  | 1,000 |  | 1,000 |  |
Acquisition costs |  |  |  | $ 10,600 |  | $ 11,400 |  |
Cash consideration |  |  |  |  |  |  |  | $ 359,624
Blattner Holding Company | Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration | $ 2,290,000 |  |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) | 3,300,000 |  |  |  |  |  |  |
Value of quanta common stock issued | $ 345,400 |  |  |  |  |  |  |
Aggregate maximum payout amount | $ 300,000 |  |  |  |  |  |  |
Business Providing Electric Power Construction And Related Services | Subsequent Event |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) |  | 42,748 |  |  |  |  |  |
Value of quanta common stock issued |  | $ 4,000 |  |  |  |  |  |
Cash consideration |  | $ 50,000 |  |  |  |  |  |

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