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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Total net realized investment gains (losses) |  | $ 7,323 | $ (2,690) | $ (22,332) | $ 11,290
Equity securities, Gross realized gains |  | 4,942 | 1,681 | 14,669 | 26,936
Equity securities, Gross realized losses |  | (55) | (3,146) | (31,870) | (9,076)
Equity securities, Total net realized investment gains (losses) |  | 4,887 | (1,465) | (17,201) | 17,860
Not Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Gross realized gains |  | 1,520 | 341 | 19,514 | 341
Gross realized losses |  | (1,360) | (2,512) | (41,673) | (9,745)
Total net realized investment gains (losses) | [1] | 160 | (2,171) | (22,159) | (9,404)
Fixed Maturities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Gross realized gains |  | 2,705 | 1,054 | 21,685 | 5,765
Gross realized losses |  | (429) | (108) | (4,657) | (2,931)
Total net realized investment gains (losses) |  | $ 2,276 | $ 946 | $ 17,028 | $ 2,834
[1] | Includes periodic net interest settlements related to the derivatives of $1.4 million and $0.3 million for the quarters ended September 30, 2020 and 2019, respectively, and $3.1 million and $0.7 million for the nine months ended September 30, 2020 and 2019, respectively.

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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