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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on sales of securities |  | $ 29,924 | $ 3,347 | $ 4,054
Income tax expense |  | (202,014) | (281,727) | 84,857
Net (Loss) income |  | 466,201 | $ 495,401 | $ (47,156)
Reclassifications, net of tax | [1] | (3,060) |  |
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] | (8,484) |  |
Amortization of defined benefit pension |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassifications, before tax | [1] | (8,235) |  |
Tax benefit | [1] | 3,432 |  |
Reclassifications, net of tax | [1] | (4,803) |  |
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] | 2,988 |  |
Income tax expense | [1] | (1,245) |  |
Net (Loss) income | [1] | $ 1,743 |  |
[1] | Amounts in parentheses indicate expense items.
[2] | See Note 12, "Employee Benefits," for additional information.

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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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