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Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Cash flow hedge: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 583,400 | $ 464,579 | $ 463,805
Related income tax effect |  | $ (31,068) |  | $ (33,735) |  | $ (31,367) |  | $ (22,627) |  | $ (26,651) |  | $ (24,649) |  | $ (18,878) |  | $ (21,405) |  | (118,797) | (91,583) | (97,492)
Net income (loss) |  | 128,828 | [1] | 130,748 | [1] | 120,721 | [1] | 84,306 | [1] | 94,408 | [1] | 95,267 | [1] | 96,507 | [1] | 86,814 | [1] | 464,603 | 372,996 | 366,313
Pension plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,089 | 12,348 | 2,635
Amortization of net actuarial loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69 | 2,315 | 3,347
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 583,400 | 464,579 | 463,805
Related income tax effect |  | (31,068) |  | (33,735) |  | (31,367) |  | (22,627) |  | (26,651) |  | (24,649) |  | (18,878) |  | (21,405) |  | (118,797) | (91,583) | (97,492)
Net income (loss) |  | $ 128,828 | [1] | $ 130,748 | [1] | $ 120,721 | [1] | $ 84,306 | [1] | $ 94,408 | [1] | $ 95,267 | [1] | $ 96,507 | [1] | $ 86,814 | [1] | 464,603 | $ 372,996 | $ 366,313
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedge: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,948) |  |
Pension plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,948) |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain Loss Net Cash Flow Hedge Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedge: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net reclassification adjustment for losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,718) |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,718) |  |
Related income tax effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,323 |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,395) |  |
Pension plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,718) |  |
Related income tax effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,323 |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,395) |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flow hedge: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,158 |  |
Related income tax effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,711) |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,447 |  |
Pension plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,089 |  |
Amortization of net actuarial loss | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69 |  |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,158 |  |
Related income tax effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,711) |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,447 |  |
[1] | For further information, see the related discussion “Quarterly Results” included in Management’s Discussion and Analysis.
[2] | This AOCI component is included in the computation of changes in plan assets (see Note O, Employee Benefit Plans)
[3] | This AOCI component is included in the computation of net periodic pension cost (see Note O, Employee Benefit Plans)

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