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Condensed Statements of Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest income | $ 1,691,584 | $ 1,683,067 | $ 1,708,098
Dividends received from subsidiaries | (345,000) |  |
Gain on sale of securities | 4,054 | 14,029 | 21,036
Other income | 100,333 | 75,746 | 41,800
Operating expenses | 615,600 | 579,170 | 591,778
Income tax benefit | 84,857 | (287,669) | (271,579)
Net (Loss) income | (47,156) | 485,397 | 475,547
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest income | 1,027 | 715 | 702
Dividends received from subsidiaries | 345,000 | 410,000 | 450,000
Gain on sale of securities |  | 261 |
Other income | 527 | 520 | 525
Gross income | 346,554 | 411,496 | 451,227
Operating expenses | 48,255 | 42,370 | 38,268
Income before income tax | 298,299 | 369,126 | 412,959
Income tax benefit | 20,720 | 17,570 | 16,547
Income before income tax benefit and equity in (overdistributed) underdistributed earnings of subsidiaries | 319,019 | 386,696 | 429,506
Equity in (overdistributed) underdistributed earnings of subsidiaries | (366,175) | 98,701 | 46,041
Net (Loss) income | $ (47,156) | $ 485,397 | $ 475,547

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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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