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Segment Information | 3 Months Ended
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Mar. 31, 2026
Segment Reporting [Abstract] |
Segment Information | 3. SEGMENT INFORMATION: Quanta’s operations are managed by senior executives who report to its Chief Executive Officer, the chief operating decision maker. The Chief Executive Officer uses operating income for each of Quanta’s reportable segments and considers forecast to actual variances to assess performance and when making decisions about allocating capital, craft skill labor and other resources. Quanta’s two operating segments are also its two reportable segments: (1) Electric Infrastructure Solutions (Electric) and Underground Utility and Infrastructure Solutions (Underground and Infrastructure). Segment operating expenses (excluding depreciation expense) primarily include cost of services, such as wages and benefits; subcontractor costs; materials; certain equipment rental and maintenance costs, and other direct and indirect project costs, as well as allocated segment selling, general and administrative expenses. Integrated operations and common administrative support for Quanta’s operating companies require that allocations be made to determine segment profitability, including allocations of certain corporate shared and indirect operating costs, as well as general and administrative costs. Separate measures of Quanta’s assets and cash flows by reportable segment, including capital expenditures, are not produced or utilized by the Chief Executive Officer to evaluate segment performance since certain of Quanta’s fixed assets are used on an interchangeable basis across its reportable segments. As such, for reporting purposes, total depreciation expense is determined quarterly by allocating depreciation expense at each legal entity to Quanta’s reportable segments based on the ratio of each legal entity’s revenue contribution to each of Quanta’s segments. Corporate and non-allocated costs include corporate facility costs; non-allocated corporate salaries, benefits and incentive compensation; acquisition and integration costs; non-cash stock-based compensation; amortization related to intangible assets; asset impairment related to goodwill and intangible assets; and change in fair value of contingent consideration liabilities. The following tables show segment financial information in thousands of dollars for the periods presented. All revenues are from external customers. Segment operating margin is calculated by dividing operating income by revenues.
Three Months Ended March 31, 2026 |  | Electric |  | Underground and Infrastructure |  | Total
Revenues |  | $ | 6,468,657 |  |  | $ | 1,406,130 |  |  | $ | 7,874,787 |
Segment operating expense (excluding segment depreciation expense) |  | 5,839,272 |  |  | 1,275,016 |  |  | 7,114,288 |
Segment depreciation expense |  | 82,772 |  |  | 25,497 |  |  | 108,269 |
Segment operating expenses |  | 5,922,044 |  |  | 1,300,513 |  |  | 7,222,557 |
Equity in earnings of integral unconsolidated affiliates |  | 14,469 |  |  | — |  |  | 14,469 |
Segment operating income |  | $ | 561,082 |  |  | $ | 105,617 |  |  | $ | 666,699 |
Segment operating margin |  | 8.7 | % |  | 7.5 | % |  |
Corporate and non-allocated costs (1) |  |  |  |  |  | (327,920) |
Total consolidated operating income |  |  |  |  |  | $ | 338,779 |
Three Months Ended March 31, 2025 |  | Electric |  | Underground and Infrastructure |  | Total
Revenues |  | $ | 4,944,391 |  |  | $ | 1,288,943 |  |  | $ | 6,233,334 |
Segment operating expense (excluding segment depreciation expense) |  | 4,482,845 |  |  | 1,186,007 |  |  | 5,668,852 |
Segment depreciation expense |  | 66,311 |  |  | 26,069 |  |  | 92,380 |
Segment operating expenses |  | 4,549,156 |  |  | 1,212,076 |  |  | 5,761,232 |
Equity in earnings of integral unconsolidated affiliates |  | 12,929 |  |  | — |  |  | 12,929 |
Segment operating income |  | $ | 408,164 |  |  | $ | 76,867 |  |  | $ | 485,031 |
Segment operating margin |  | 8.3 | % |  | 6.0 | % |  |
Corporate and non-allocated costs (1) |  |  |  |  |  | (245,950) |
Total consolidated operating income |  |  |  |  |  | $ | 239,081 |
(1) Corporate and non-allocated costs included amortization expense of $152.4 million and $109.6 million and non-cash stock-based compensation of $62.6 million and $38.2 million for the three months ended March 31, 2026 and 2025.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-21 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name 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