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Discontinued operations - Schedule of Income and Expense Constituting Pretax Income (Loss) From Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Discontinued operations, net of tax | $ (39) | $ 49,012 | $ (938) | $ 115,370
Everus Corporation | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Operating revenues | 0 | 760,822 | 2 | 2,089,446
Operating expenses | 52 | 705,135 | 1,195 | 1,944,457
Operating (loss) income | (52) | 55,687 | (1,193) | 144,989
Other income | 0 | 4,868 | 0 | 11,044
Interest expense | 0 | 2,128 | 0 | 6,431
(Loss) income from discontinued operations before income taxes | (52) | 58,427 | (1,193) | 149,602
Income tax (benefit) expense | (13) | 9,415 | (255) | 34,232
Discontinued operations, net of tax | $ (39) | $ 49,012 | $ (938) | $ 115,370

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