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Condensed Statements of Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest income | $ 1,805,160 | $ 1,689,673 | $ 1,582,239
Dividends received from subsidiaries | (380,000) |  |
Other income | 18,845 | 35,535 | 45,662
Operating expenses | 511,218 | 546,628 | 641,218
Income tax benefit | (128,264) | (135,252) | (202,014)
Net income | 395,043 | 422,417 | 466,201
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest income | 668 | 500 | 943
Dividends received from subsidiaries | 380,000 | 380,000 | 336,000
Other income | 716 | 793 | 1,700
Gross income | 381,384 | 381,293 | 338,643
Operating expenses | 49,926 | 59,372 | 54,333
Income before income tax benefit and equity in underdistributed earnings of subsidiaries | 331,458 | 321,921 | 284,310
Income tax benefit | 13,669 | 16,616 | 19,575
Income before equity in underdistributed earnings of subsidiaries | 345,127 | 338,537 | 303,885
Equity in underdistributed earnings of subsidiaries | 49,916 | 83,880 | 162,316
Net income | $ 395,043 | $ 422,417 | $ 466,201

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- Definition This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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