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Acquisitions - Narrative (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 13, 2021 USD ($) shares | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) Businesses shares
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in fair value of contingent consideration liabilities |  | $ 809 | $ (210) | $ 5,978 | $ (573) |  |
Net tangible assets acquired |  |  |  |  |  | $ 243,200 |
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
Blattner Holding Company |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | $ 2,430,000 |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) | shares | 3,326,955 |  |  |  |  |  |
Value of quanta common stock issued | $ 345,400 |  |  |  |  |  |
Contingent consideration payments (up to) | $ 300,000 |  |  |  |  |  |
Post-acquisition period, financial performance objectives | 3 years |  |  |  |  |  |
Total contingent consideration liabilities | $ 125,600 | 140,300 |  | 140,300 |  | 140,300 |
Change in fair value of contingent consideration liabilities |  | 2,800 |  | 7,000 |  |  |
Post-acquisition period, deferred earnings, accrued interest | 5.00% |  |  |  |  |  |
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] |  |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) | shares |  |  |  |  |  |  | 187,093
Value of quanta common stock issued |  |  |  |  |  |  | $ 16,900
Cash consideration |  |  |  |  |  |  | $ 328,000
All Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration payments (up to) |  | $ 312,000 |  | $ 312,000 |  | $ 312,000 |
Acquisitions 2021 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenues included in consolidated results of operations |  |  | 1,200 |  | 1,200 |  |
Income (loss) before taxes |  |  | 300 |  | 100 |  |
Acquisition costs |  |  | $ 200 |  | $ 400 |  |

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