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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net gain on sales of securities |  | $ 1,979 | $ 163
Income tax (benefit) expense |  | (60,197) | (74,922)
Net income |  | 103,957 | $ 129,909
Reclassifications, net of tax | [1] | (123) |
Past service liability |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, before tax | [1],[2] | 62 |
Actuarial losses |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, before tax | [1],[2] | (2,121) |
Amortization of defined benefit pension |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, before tax | [1] | (2,059) |
Tax benefit | [1] | 858 |
Reclassifications, net of tax | [1] | (1,201) |
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains on available for sale securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net gain on sales of securities | [1] | 1,848 |
Income tax (benefit) expense | [1] | (770) |
Net income | [1] | $ 1,078 |
[1] | Amounts in parentheses indicate expense items.
[2] | See Note 9, "Pension and Other Post-Retirement 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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