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Customer [Member] Customer Term in years Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Common stock repurchases (in shares) Common stock repurchased (in shares) Treasury Stock, Shares, Acquired Valuation date price based on closing prices of Quanta common stock on February 26,2026 and April 10, 2026 for 2026 and February 27,2025 for 2025 (in usd per share) Share Price Reclassification of foreign currency translation losses to net income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax PEO Name PEO Name Geographical [Axis] Geographical [Axis] Number of service contract categories Number of Service Contract Categories Number of Service Contract Categories Payments of contingent consideration liabilities recorded at acquisition date Payment for Contingent Consideration Liability, Financing Activities Stock Price or 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consideration paid Cash paid or payable Payments to Acquire Businesses, Gross Non-cash stock-based compensation Non-cash stock compensation expense Share-Based Payment Arrangement, Noncash Expense Secondary Pool Secondary Pool [Member] Secondary Pool Long-term Debt Obligations Schedule of Debt [Table Text Block] Investment, Name [Domain] Investment, Name [Domain] Customer [Domain] Customer [Domain] Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Earnings Per Share, Basic Raw materials Inventory, Raw Materials, Gross Senior Credit Facility Senior Credit Facility [Member] Senior Credit Facility [Member] Repurchase of common stock Repurchase of common stock Payments for Repurchase of Common Stock Contract liabilities Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider 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Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Number of common shares issued in connection with performance units (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Percent of total revenues (in percent) Percentage Of Total Revenues Percentage Of Total Revenues Cover [Abstract] Foreign Countries Non-US [Member] Concentration risk percentage (in percent) Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Others Other Countries [Member] Other Countries Lease financing transactions Lease Financing Transaction, Liability Lease Financing Transaction, Liability Equity Awards Adjustments Equity Awards Adjustments [Member] Performance Stock Units (PSUs) to be settled in Common Stock Performance Stock Units (PSUs) [Member] Performance units. 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Equity Parent [Member] Accounts Payable and Accrued Expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Deferred compensation liabilities Increase (Decrease) in Deferred Compensation Average daily amount outstanding Line of Credit Facility, Average Outstanding Amount Investments in unconsolidated affiliates and other Payments to Acquire Investments Current portion of operating lease liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Liability, Current Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Liability, Current Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Discount rates (in percent) Fair Value Inputs, Discount Rate Fair Value Inputs, Discount Rate Cash, cash equivalents, and restricted cash Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent and Restricted Cash Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent and Restricted Cash Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Adjustment to Compensation: Adjustment to Compensation [Axis] Accounts payable and accrued expenses, insurance and other non-current liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Total cash and cash equivalents held by joint ventures Investments In Joint Ventures [Member] Investments In Joint Ventures [Member] Credit Concentration Risk Credit Concentration Risk [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Related insurance recoveries/receivables included in other assets Insurance Settlements Receivable, Noncurrent Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Non-current retainage balances Contract with Customer, Receivable, after Allowance for Credit Loss, Noncurrent Deferred revenues Contract With Customer, Liability, Deferred Revenues, Current Contract With Customer, Liability, Deferred Revenues, Current Long-term debt, net of current maturities Long-Term Debt and Lease Obligation Name Measure Name Insurance, Type [Domain] Insurance, Type [Domain] Insurance, Type [Domain] Income Taxes Income Tax Disclosure [Text Block] Schedule of Cash and Cash Equivalents [Table] Cash and Cash Equivalent [Table] Pay 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Company Selected Measure Amount Change in contract estimates, favorable (unfavorable) impact on revenue, percent Contract With Customer, Cumulative Catch-Up Adjustment, Revenue, Change In Estimate, Percent Contract With Customer, Cumulative Catch-Up Adjustment, Revenue, Change In Estimate, Percent Stock-based compensation activity (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest COLI assets Life Insurance, Corporate or Bank Owned, Change in Value Current Assets: Assets, Current [Abstract] Revenues Business Combination, Pro Forma Information, Pro Forma Revenue Receivables Benchmark Receivables Benchmark [Member] Receivables Benchmark Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment 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