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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on sales of securities |  | $ 4,054 | $ 14,029 | $ 21,036
Income tax (benefit) expense |  | 84,857 | (287,669) | (271,579)
Net (Loss) income |  | (47,156) | $ 485,397 | $ 475,547
Reclassifications, net of tax | [1] | 4,450 |  |
Past-service cost |  |  |  |
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] | (8,591) |  |
Amortization of defined benefit pension |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax | [1] | (8,342) |  |
Tax benefit | [1] | 3,458 |  |
Reclassifications, net of tax | [1] | (4,884) |  |
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 sales of securities | [1] | 740 |  |
Income tax (benefit) expense | [1] | (306) |  |
Net (Loss) income | [1] | $ 434 |  |
[1] | Amounts in parentheses indicate expense items.
[2] | Please see Note 12, "Employee Benefits," for additional information.

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