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Stockholder's Equity - Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Amortization of pension and postretirement items: |  |  |  |
Tax benefit | $ (7,600) | $ (6,800) | $ (35,000) | $ (30,200)
Derivative, Gain (Loss) on Derivative, Net | 0 | 200 | 1,000 | 1,600
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan |  |  | 76,300 | 56,800
Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] | Interest Expense [Member] |  |  |  |
Amortization of pension and postretirement items: |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 100 | $ 300 | $ 300 | $ 600

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