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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net gain (loss) on securities |  |  |  | $ 7,755 |
Income tax (expense) benefit |  | $ (33,172) | $ (30,022) | (97,305) | $ (104,398)
Net income |  | $ 99,046 | $ 106,772 | 293,869 | $ 320,678
Reclassifications, net of tax | [1] |  |  | (1,462) |
Past service liability |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassifications, before tax | [1],[2] |  |  | 187 |
Actuarial losses |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassifications, before tax | [1],[2] |  |  | (7,619) |
Amortization of defined benefit pension |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassifications, before tax | [1] |  |  | (7,432) |
Tax benefit | [1] |  |  | 2,052 |
Reclassifications, net of tax | [1] |  |  | (5,380) |
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available-for-sale securities |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net gain (loss) on securities | [1] |  |  | 5,445 |
Income tax (expense) benefit | [1] |  |  | (1,527) |
Net income | [1] |  |  | $ 3,918 |
[1] | Amounts in parentheses indicate expense items.
[2] | See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.

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