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Acquisitions - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 17, 2024 USD ($) shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) business shares | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) business shares
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration paid, net of cash acquired |  |  |  | $ 1,724,440 | $ 472,643 |  |
Contingent consideration, liability |  | $ 278,270 |  | 278,270 |  | $ 278,270 | $ 157,073
Net tangible assets acquired |  |  |  |  |  | 593,300 |
Intangible assets |  |  |  |  |  | 947,000 |
Goodwill, acquired during period |  |  |  |  |  | 1,380,000 |
Cash payment for contingent consideration liabilities |  |  |  |  | 5,000 |  |
CEI |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | $ 1,660,000 |  |  | 1,655,373 |  |  |
Number of shares granted for acquired companies (in shares) | shares | 882,926 |  |  |  |  |  |
Value of Quanta common stock issued | $ 216,300 |  |  | 216,264 |  |  |
Cash consideration paid, net of cash acquired | 1,240,000 |  |  |  |  |  |
Contingent consideration payments (up to) | $ 200,000 |  |  |  |  |  |
Business combination, period for performance targets to be achieved (in years) | 3 years |  |  |  |  |  |
Percentage of contingent consideration that can be paid in common stock | 10.00% |  |  |  |  |  |
Contingent consideration, liability | $ 96,100 | 96,086 |  | 96,086 |  | 96,086 |
Intangible assets |  |  |  | 656,000 |  |  |
Acquisition costs |  | 453,800 |  | 453,800 |  |  |
Acquisitions 2024 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill expected to be deductible for income tax |  | 49,000 |  | 49,000 |  | 49,000 |
Revenues included in consolidated results of operations |  | 613,200 |  | 757,500 |  |  |
Income (loss) before taxes |  | 4,100 |  | (9,700) |  |  |
Amortization expense |  | 40,300 |  | 52,100 |  |  |
Acquisition costs |  | 6,600 |  | 16,800 |  |  |
Acquisitions 2023 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 777,600
Number of shares granted for acquired companies (in shares) | shares |  |  |  |  |  |  | 1,238,576
Value of Quanta common stock issued |  |  |  |  |  |  | $ 158,900
Number of businesses acquired | business |  |  |  |  |  |  | 5
Revenues included in consolidated results of operations |  |  | $ 117,400 |  | 354,000 |  |
Income (loss) before taxes |  |  | 3,500 |  | 300 |  |
Amortization expense |  |  | 7,300 |  | 22,300 |  |
Acquisition costs |  |  | $ 1,800 |  | $ 19,600 |  |
Acquisitions, Multiple Periods |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration payments (up to) |  | 580,700 |  | 580,700 |  | 580,700 |
All Others |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 537,795 |  |  |
Number of shares granted for acquired companies (in shares) | shares |  |  |  | 334,472 |  |  |
Value of Quanta common stock issued |  |  |  | $ 74,797 |  |  |
Contingent consideration, liability |  | $ 29,166 |  | $ 29,166 |  | $ 29,166 |
Number of businesses acquired | business |  |  |  | 7 |  |  |
Intangible assets |  |  |  | $ 213,573 |  |  |

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