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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Net gain on sales of securities |  | $ 26,936 | $ 13 | $ 28,915 | $ 176
Income tax (benefit) expense |  | (65,447) | (74,673) | (125,644) | (149,595)
Net income |  | $ 115,255 | $ 126,460 | 219,212 | $ 256,369
Reclassifications, net of tax | [1] |  |  | (1,324) |
Past service liability |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassifications, before tax | [1],[2] |  |  | 124 |
Actuarial losses |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassifications, before tax | [1],[2] |  |  | (4,242) |
Amortization of defined benefit pension |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassifications, before tax | [1] |  |  | (4,118) |
Tax benefit | [1] |  |  | 1,716 |
Reclassifications, net of tax | [1] |  |  | (2,402) |
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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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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