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Acquisitions - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 13, 2021 USD ($) shares | Jul. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) Businesses shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total contingent consideration liabilities |  |  | $ 148,150 |  | $ 148,150 |  | $ 148,150 | $ 143,073
Net tangible assets acquired |  |  |  |  |  |  | 230,700 |
Intangible assets |  |  |  |  |  |  | 1,520,000 |
Goodwill |  |  |  |  |  |  | 1,460,000 |
Purchase price allocation adjustments |  |  |  |  | 64,900 |  |  |
Goodwill expected to be deductible for income tax |  |  |  |  |  |  |  | 1,490,000
Construction Contracting Services Business Acquisition |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration |  | $ 22,000 |  |  |  |  |  |
Contingent consideration payments (up to) |  | $ 15,000 |  |  |  |  |  |
Post-acquisition period, financial performance objectives |  | 5 years |  |  |  |  |  |
Total contingent consideration liabilities |  |  | 2,600 |  | 2,600 |  | 2,600 |
Value of Quanta common stock issued |  |  |  |  | 0 |  |  |
Cash consideration |  |  |  |  | 21,990 |  |  |
Intangible assets |  |  |  |  | 13,109 |  |  |
Goodwill |  |  |  |  | 12,225 |  |  |
Goodwill expected to be deductible for income tax |  |  | 12,200 |  | 12,200 |  | 12,200 |
Revenues included in consolidated results of operations |  |  | 5,100 |  | 5,100 |  |  |
Income (loss) before taxes |  |  | 200 |  | 200 |  |  |
Acquisition costs |  |  | 600 |  | 600 |  |  |
Blattner Holding Company |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash consideration | $ 2,430,000 |  |  |  |  |  |  |
Contingent consideration payments (up to) | $ 300,000 |  |  |  |  |  |  |
Post-acquisition period, financial performance objectives | 3 years |  |  |  |  |  |  |
Total contingent consideration liabilities | $ 125,600 |  | 134,500 |  | 134,500 |  | 134,500 | 125,632
Number of shares granted for acquired companies (in shares) | shares | 3,326,955 |  |  |  |  |  |  |
Value of Quanta common stock issued | $ 345,400 |  |  |  |  |  |  | 345,422
Post-acquisition period, deferred earnings, accrued interest | 5.00% |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  | 2,434,877
Intangible assets |  |  |  |  |  |  |  | 1,425,000
Goodwill |  |  |  |  |  |  |  | $ 1,364,155
Businesses That Provide Electric Power Construction Services In The United States |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of businesses acquired | Businesses |  |  |  |  |  |  |  | 3
Acquisitions In 2021 Excluding Blattner |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total contingent consideration liabilities |  |  |  |  |  |  |  | $ 0
Number of shares granted for acquired companies (in shares) | shares |  |  |  |  |  |  |  | 187,093
Value of Quanta common stock issued |  |  |  |  |  |  |  | $ 16,922
Cash consideration |  |  |  |  |  |  |  | 328,375
Intangible assets |  |  |  |  |  |  |  | 104,143
Goodwill |  |  |  |  |  |  |  | $ 113,948
All Acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration payments (up to) |  |  | $ 327,000 |  | $ 327,000 |  | $ 327,000 |
Acquisitions 2021 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
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 |  |

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