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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on securities |  | $ 7,725 | $ (14) | $ 29,924
Interest expense |  | 847,760 | 658,678 | 452,236
Income tax expenses\ benefit |  | (128,264) | (135,252) | (202,014)
Net income |  | 395,043 | $ 422,417 | $ 466,201
Reclassifications, net of tax | [1] | (3,156) |  |
Past service liability |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax | [1],[2] | 249 |  |
Actuarial losses |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax | [1],[2] | (10,160) |  |
Amortization of defined benefit pension |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax | [1] | (9,911) |  |
Tax benefit | [1] | 2,726 |  |
Reclassifications, net of tax | [1] | (7,185) |  |
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 on securities | [1] | 5,445 |  |
Income tax expenses\ benefit | [1] | (1,527) |  |
Net income | [1] | 3,918 |  |
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains (loss) on cash flow hedges |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | [1] | 154 |  |
Income tax expenses\ benefit | [1] | (43) |  |
Net income | [1] | $ 111 |  |
[1] | Amounts in parentheses indicate expense items.
[2] | See Note 14, “Employee Benefits,” for additional information.

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