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Acquisitions - Narrative (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 17, 2024 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) business shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) business shares
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net tangible assets acquired |  |  |  |  |  | $ 183,000,000.0 |
Intangible assets |  |  |  |  |  | 265,500,000 |
Goodwill, acquired during period |  |  |  |  |  | 434,600,000 |
Cash payment for contingent consideration liabilities |  |  |  |  | $ 5,000,000.0 |  |
Acquisitions 2024 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 540,168,000 |  |  |
Number of shares granted for acquired companies (in shares) | shares |  |  |  | 286,425 |  |  |
Value of Quanta common stock issued |  |  |  | $ 60,821,000 |  |  |
Number of businesses acquired | business |  |  |  | 5 |  |  |
Cash consideration |  |  |  | $ 463,884,000 |  |  |
Intangible assets |  |  |  | 179,977,000 |  |  |
Goodwill expected to be deductible for income tax |  | $ 15,200,000 |  | 15,200,000 |  | 15,200,000 |
Revenues included in consolidated results of operations |  | 76,600,000 |  | 144,300,000 |  |  |
Income (loss) before taxes |  | (4,700,000) |  | (13,800,000) |  |  |
Amortization expense |  | 7,000,000.0 |  | 11,800,000 |  |  |
Acquisition costs |  | 4,300,000 |  | 10,200,000 |  |  |
Acquisitions 2023 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) | shares |  |  |  |  |  |  | 1,238,576
Value of Quanta common stock issued |  |  |  |  |  |  | $ 158,900,000
Number of businesses acquired | business |  |  |  |  |  |  | 5
Cash consideration |  |  |  |  |  |  | $ 777,300,000
Revenues included in consolidated results of operations |  |  | $ 143,100,000 |  | 236,600,000 |  |
Income (loss) before taxes |  |  | 12,900,000 |  | (3,200,000) |  |
Amortization expense |  |  | 6,400,000 |  | 15,000,000.0 |  |
Acquisition costs |  |  | $ 0 |  | $ 17,800,000 |  |
Acquisitions, Multiple Periods |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration payments (up to) |  | $ 365,600,000 |  | $ 365,600,000 |  | $ 365,600,000 |
Cupertino Electric Inc. (Cupertino) | Subsequent Event |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred | $ 1,500,000,000 |  |  |  |  |  |
Value of Quanta common stock issued | 216,300,000 |  |  |  |  |  |
Contingent consideration payments (up to) | $ 200,000,000.0 |  |  |  |  |  |
Business combination, period for performance targets to be achieved (in years) | 3 years |  |  |  |  |  |

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