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Acquisitions - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 13, 2021 USD ($) shares | Jan. 31, 2023 USD ($) business shares | Jul. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) business shares | Dec. 31, 2020 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of contingent consideration liability |  |  |  | $ 148,517 | $ 143,073 |
Purchase price allocation adjustments |  |  |  | 66,416 | (1,791) |
Goodwill expected to be deductible for income tax purposes |  |  |  | 12,200 | 1,490,000 | $ 72,600
Cash payment for contingent consideration liabilities |  |  |  | $ 1,600 | $ 300 | $ 76,000
Shares transferred in settlement of contingent consideration liabilities (in shares) | shares |  |  |  |  |  | 4,277
Level 3 | Recurring | Volatility factors | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  |  | 0.50 |
Minimum | Level 3 | Recurring | Volatility factors | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.350 |  |
Minimum | Level 3 | Recurring | Weighted average cost of capital | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.145 | 0.165 |
Minimum | Level 3 | Recurring | Discount rates | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.0171 | 0.0004 |
Maximum | Level 3 | Recurring | Volatility factors | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.500 |  |
Maximum | Level 3 | Recurring | Weighted average cost of capital | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.175 | 0.170 |
Maximum | Level 3 | Recurring | Discount rates | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.0630 | 0.0218 |
Weighted Average | Level 3 | Recurring | Volatility factors | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.425 | 0.50 |
Weighted Average | Level 3 | Recurring | Weighted average cost of capital | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.160 | 0.168 |
Weighted Average | Level 3 | Recurring | Discount rates | Valuation, Market Approach |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration liability, measurement input |  |  |  | 0.045 | 0.014 |
Renewable Energy Infrastructure Solutions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price allocation adjustments |  |  |  | $ 64,874 | $ 0 |
Construction Contracting Services Business Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate cash consideration paid |  |  | $ 22,000 |  |  |
Post-acquisition period, financial performance objectives |  |  | 5 years |  |  |
Value of Quanta common stock issued |  |  |  | 0 |  |
Fair value of contingent consideration liability |  |  |  | 2,600 |  |
Cash consideration |  |  |  | 21,990 |  |
Blattner |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate cash consideration paid | $ 2,430,000 |  |  |  |  |
Post-acquisition period, financial performance objectives | 3 years |  |  |  |  |
Contingent consideration payments (up to) | $ 300,000 |  |  |  |  |
Number of shares granted for acquired companies (in shares) | shares | 3,326,955 |  |  |  |  |
Value of Quanta common stock issued | $ 345,400 |  |  |  | 345,422 |
Fair value of contingent consideration liability |  |  |  | 134,500 | 125,632 |
Cash consideration |  |  |  |  | $ 2,434,877 |
Businesses That Provide Electric Power Construction Services In The United States |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of businesses acquired | business |  |  |  |  | 3 |
All Others |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) | shares |  |  |  |  | 187,093 |
Value of Quanta common stock issued |  |  |  |  | $ 16,922 |
Fair value of contingent consideration liability |  |  |  |  | 0 |
Cash consideration |  |  |  |  | 328,155 |
2020 Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of shares granted for acquired companies (in shares) | shares |  |  |  |  |  | 1,334,469
Value of Quanta common stock issued |  |  |  |  |  | $ 57,100
Cash consideration |  |  |  |  |  | $ 359,600
Contingent consideration financial target term |  |  |  |  |  | 5 years
Revenues included in consolidated results of operations |  |  |  |  |  | $ 133,500
Income from continuing operations before income taxes included in consolidated results of operations |  |  |  |  |  | (1,300)
Amortization expense |  |  |  |  |  | 6,400
Acquisition-related costs |  |  |  |  |  | $ 17,500
All Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration payments (up to) |  |  |  | 326,600 |  |
Acquisitions 2022 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenues included in consolidated results of operations |  |  |  | 15,500 |  |
Income from continuing operations before income taxes included in consolidated results of operations |  |  |  | 2,000 |  |
Amortization expense |  |  |  | (1,400) |  |
Acquisition-related costs |  |  |  | $ 600 |  |
2021 Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenues included in consolidated results of operations |  |  |  |  | 499,600 |
Income from continuing operations before income taxes included in consolidated results of operations |  |  |  |  | (71,600) |
Amortization expense |  |  |  |  | 80,300 |
Acquisition-related costs |  |  |  |  | $ 41,500 |
Businesses That Provide Various Services In The United States | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate cash consideration paid |  | $ 465,000 |  |  |  |
Number of shares granted for acquired companies (in shares) | shares |  | 1,018,952 |  |  |  |
Value of Quanta common stock issued |  | $ 123,500 |  |  |  |
Number of businesses acquired | business |  | 3 |  |  |  |

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