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Reserved for Future Issuance 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 PEO Name PEO Name Geographical [Axis] Geographical [Axis] Receivables Benchmark Receivables Benchmark [Member] Receivables Benchmark Payments of contingent consideration liabilities recorded at acquisition date Payment for Contingent Consideration Liability, Financing Activities Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Revenues recognized related to change orders and claims Contract With Customer, Revenue Recognized, Related To Unapproved Change Orders And Claims Revenue Recognized, Related To Unapproved Change Orders And Claims Common stock repurchases Treasury Stock, Value, Acquired, Cost Method Business Combination, Intangible Asset, Acquired, Finite-Lived and Indefinite-Lived Business Combination, Intangible Asset, Acquired, Finite-Lived and Indefinite-Lived [Table Text Block] Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Total cash, cash equivalents, and restricted cash reported in the statements of cash flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Segment operating income Segment Operating Income Segment Operating Income Other accrued expenses Other Accrued Liabilities, Current Entity 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Stock Common Stock [Member] Expected volatility (in percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Total contingent consideration liabilities Business Combination, Contingent Consideration, Liability Compensation 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 Operating lease liabilities, net of current portion Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Liability, Noncurrent Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease, Liability, Noncurrent Cover [Abstract] Foreign Countries Non-US [Member] Number of customers representing ten percent or more of net receivable position Number Of Customers Representing Ten Percent Or More Of Net Receivable Position Number Of Customers Representing Ten Percent Or More Of Net Receivable Position Concentration risk percentage (in percent) Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] Cash and cash equivalents not held by joint ventures or captive insurance company Cash Not Held By Joint Ventures Or Captive Insurance Company [Member] Cash Not Held By Joint Ventures [Member] Number of businesses acquired Business Combination, Number of Businesses Acquired Total liabilities and equity Liabilities and Equity Performance Stock Units (PSUs) to be settled in Common Stock Performance Stock Units (PSUs) [Member] Performance units. Employee Stock Option Share-Based Payment Arrangement, Option [Member] Current maturities of long-term debt and short-term debt Current maturities of long-term debt and short-term debt Debt, Current Non-controlling interests Equity, Attributable to Noncontrolling Interest Life insurance Life Insurance, Corporate or Bank Owned, Amount Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Other long-term debt Other Long-Term Debt Percent of total revenues recognized associated with revenue recognition method Revenue From Contract With Customer, Percentage Of Revenue Recognized Over Time Revenue From Contract With Customer, Percentage Of Revenue Recognized Over Time Other (expense) income, net Other Nonoperating Income (Expense) Commercial Paper Program Commercial Paper Program [Member] Commercial Paper Program Letters of Credit Outside of the Senior Credit Facility Letters Of Credit Outside Of The Senior Credit Facility [Member] Letters Of Credit Outside Of The Senior Credit Facility Total Stockholders' 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 Percentage of contingent consideration amounts Business Combination, Contingent Consideration, Discretionary Amount Payable In Common Stock, Percentage Business Combination, Contingent Consideration, Discretionary Amount Payable In Common Stock, Percentage Investments in unconsolidated affiliates and other Payments to Acquire Investments 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 Deferred revenues Contract With Customer, Liability, Deferred Revenues, Current Contract With Customer, Liability, Deferred Revenues, Current Integral Unconsolidated Affiliates Integral Unconsolidated Affiliates [Member] Integral Unconsolidated Affiliates 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 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] Cash and cash equivalents held by foreign joint ventures Foreign Joint Ventures [Member] Foreign Joint Ventures [Member] 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 Long-term debt, net of current maturities Long-Term Debt and Lease Obligation Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Schedule of Cash and Cash Equivalents [Table] Cash and Cash Equivalent [Table] Insurance, Type [Domain] Insurance, Type [Domain] Insurance, Type [Domain] Pay vs Performance Disclosure [Line Items] Debt Instrument [Line Items] Debt 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