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Debt Obligations - Senior Credit Facility (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 23, 2022 | Aug. 22, 2022 | Dec. 31, 2024 USD ($) quarter | Jul. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowings under senior credit facility (including Term Loan) |  |  | $ 735,445,000 |  | $ 867,137,000
Senior Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Option to increase revolving commitments under the credit agreement |  |  | 400,000,000.0 |  |
Reduction in Quanta's funded indebtedness reduced by cash and cash equivalents in excess of this amount |  |  | $ 25,000,000 |  |
Number of fiscal quarters applicable to interest coverage ratio | quarter |  |  | 4 |  |
Credit facility available for revolving loans or issuing new letters of credit |  |  | $ 2,610,000,000 |  |
Senior Credit Facility | Excess of Federal Funds Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.50% |  |  |  |
Senior Credit Facility | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commitment fee | 0.10% |  |  |  |
Senior Credit Facility | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commitment fee | 0.275% |  |  |  |
Senior Credit Facility | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum consolidated leverage ratio |  |  | 3.5 |  |
Acquisition threshold for leverage ratio |  |  | $ 200,000,000.0 |  |
Maximum consolidated leverage ratio permissible under credit agreement |  |  | 4.0 |  |
Number of fiscal quarters applicable to updated acquisition ratio | quarter |  |  | 4 |  |
Minimum consolidated interest coverage ratio |  |  | 3.0 |  |
Amount of availability under the credit agreement and/or cash and cash equivalents on hand that must be present to allow for cash payments of dividends and stock repurchases |  |  | $ 100,000,000.0 |  |
Cross default provisions with debt instruments exceeding this amount |  |  | 400,000,000.0 |  |
Senior Credit Facility | Term Loan | Payments Due First Business Day Of Quarter In 2023 And 2024 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Quarterly principal payments |  |  | 4,700,000 |  |
Senior Credit Facility | Term Loan | Payments Due First Business Day Of Quarter In 2025 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Quarterly principal payments |  |  | 9,400,000 |  |
Senior Credit Facility | Term Loan | Payments Due First Business Day Of Quarter In 2026 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Quarterly principal payments |  |  | 18,800,000 |  |
Senior Credit Facility | Term Loan | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured revolving credit facility |  |  | 750,000,000.0 |  |
Borrowings under senior credit facility (including Term Loan) |  |  | 712,500,000 |  |
Interest rate floor | 1.00% |  |  |  |
Senior Credit Facility | Term Loan | Line of Credit | Secured Overnight Financing Rate (SOFR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |
Senior Credit Facility | Term Loan | Line of Credit | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.50% |  |  |
Senior Credit Facility | Term Loan | Line of Credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.00% |  |  |
Senior Credit Facility | Term Loan | Line of Credit | Minimum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |
Senior Credit Facility | Term Loan | Line of Credit | Minimum | Base Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.00% | 0.00% |  |  |
Senior Credit Facility | Term Loan | Line of Credit | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.00% |  |  |
Senior Credit Facility | Term Loan | Line of Credit | Maximum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.625% |  |  |  |
Senior Credit Facility | Term Loan | Line of Credit | Maximum | Base Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.625% | 0.625% |  |  |
Senior Credit Facility | Term Loan | Line of Credit | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.625% |  |  |
Senior Credit Facility | Revolving Credit Facility | Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured revolving credit facility |  |  | 2,800,000,000 | $ 2,800,000,000 |
Borrowings under senior credit facility (including Term Loan) |  |  | 22,900,000 |  |
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Minimum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.125% |  |  |  |
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Minimum | Base Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.125% |  |  |  |
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Minimum | Alternative Currency Term Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.125% |  |  |  |
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Maximum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.75% |  |  |  |
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Maximum | Base Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.75% |  |  |  |
Senior Credit Facility | Revolving Credit Facility | Line of Credit | Maximum | Alternative Currency Term Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.75% |  |  |  |
Senior Credit Facility | Standby Letters of Credit | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.125% |  |  |  |
Senior Credit Facility | Standby Letters of Credit | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.75% |  |  |  |
Senior Credit Facility | Performance Letters of Credit | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.675% |  |  |  |
Senior Credit Facility | Performance Letters of Credit | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.125% |  |  |  |
Senior Credit Facility | Letters of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Letters of credit and bank guarantees under the credit facility |  |  | 167,400,000 |  |
Senior Credit Facility | Letters of Credit and Bank Guarantees | U.S. Dollars |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Letters of credit and bank guarantees under the credit facility |  |  | 79,800,000 |  |
Senior Credit Facility | Letters of Credit and Bank Guarantees | Canadian Dollars |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Letters of credit and bank guarantees under the credit facility |  |  | 87,600,000 |  |
Surety-Backed Letters Of Credit | Letters of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Senior secured revolving credit facility |  |  | $ 500,000,000 |  |

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