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Investments - Summary of Available-for-Sale Debt Securities and Equity Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Proceeds from sales and maturities (fair value) | $ 773,673 | $ 61,615 | $ 873,355 | $ 173,345
Proceeds from sales of equity securities | 0 | 0 | 0 | 29,137
Gross realized gains on sale of securities | 53,893 | 65 | 54,779 | 364
Equity securities, FV-NI, Realized Gain | 0 | 0 | 0 | 335
Gross realized losses on sale of securities | (66) | (87) | (485) | (277)
Equity securities, FV-NI, Realized Loss | $ 0 | $ 0 | $ 0 | $ (14,787)

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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