DETAIL OF CERTAIN ACCOUNTS (Tables)
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12 Months Ended |
Dec. 31, 2025 |
| Organization, Consolidation and Presentation of Financial Statements [Abstract] |
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| Cash and Cash Equivalents |
Amounts related to cash and cash equivalents held by consolidated or proportionately consolidated joint ventures and the captive insurance company, which are included in Quanta’s total cash and cash equivalents balances, were as follows (in thousands): | | | | | | | | | | | | | | | | | | December 31, | | | | 2025 | | 2024 | | Cash and cash equivalents held by domestic joint ventures | | $ | 63,620 | | | $ | 71,646 | | | Cash and cash equivalents held by foreign joint ventures | | 10,639 | | | 10,088 | | | Total cash and cash equivalents held by joint ventures | | 74,259 | | | 81,734 | | | Cash and cash equivalents held by captive insurance company | | 19,595 | | | 19,445 | | | Cash and cash equivalents not held by joint ventures or captive insurance company | | 345,654 | | | 640,781 | | | Total cash and cash equivalents | | $ | 439,508 | | | $ | 741,960 | |
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| Schedule of Inventory |
Inventories consisted of the following (in thousands): | | | | | | | | | | | | | | | | | December 31, | | | | 2025 | | 2024 | Construction materials and aviation spare parts | | $ | 143,994 | | | $ | 114,458 | | Raw materials | | 64,758 | | | 39,930 | | Work-in-process | | 4,427 | | | 4,607 | | Finished goods and merchandise purchased for resale | | 157,193 | | | 101,186 | | Total Inventories, net | | $ | 370,372 | | | $ | 260,181 | |
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| Schedule of Other Current Assets |
Prepaid expenses and other current assets consisted of the following (in thousands): | | | | | | | | | | | | | | | | | December 31, | | | | 2025 | | 2024 | | Prepaid expenses | | $ | 488,488 | | | $ | 268,093 | | | Other current assets | | 235,772 | | | 201,245 | | | Prepaid expenses and other current assets | | $ | 724,260 | | | $ | 469,338 | |
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| Property and Equipment |
Property and equipment consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | Estimated Useful | | December 31, | | | Lives in Years | | 2025 | | 2024 | | Land | N/A | | $ | 158,270 | | | $ | 134,590 | | | Buildings and leasehold improvements | 5-30 | | 619,808 | | | 514,888 | | | Operating machinery and equipment | 1-25 | | 2,474,357 | | | 2,160,333 | | | Vehicles and aviation | 2-25 | | 1,488,986 | | | 1,187,538 | | | Office equipment, furniture and fixtures and information technology systems | 3-10 | | 336,153 | | | 298,878 | | | Construction work in progress | N/A | | 287,433 | | | 125,676 | | Finance lease assets and lease financing transactions | 5-20 | | 337,964 | | | 239,806 | | | Property and equipment, gross | | | 5,702,971 | | | 4,661,709 | | | Less — Accumulated depreciation and amortization | | | (2,247,767) | | | (1,961,432) | | | Property and equipment, net of accumulated depreciation | | | $ | 3,455,204 | | | $ | 2,700,277 | |
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| Accounts Payable and Accrued Expenses |
Accounts payable and accrued expenses consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | December 31, | | | | 2025 | | 2024 | | Accounts payable, trade | | $ | 2,832,600 | | | $ | 2,096,125 | | | Accrued compensation and related expenses | | 781,610 | | | 651,893 | | | Other accrued expenses | | 965,248 | | | 974,325 | | | Accounts payable and accrued expenses | | $ | 4,579,458 | | | $ | 3,722,343 | |
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