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Schedule of Investments in Equity Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, at fair value | $ 75,941 | $ 263,104
Common Stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, at fair value | 0 | 135,329
Preferred Stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, at fair value | 11,268 | 11,656
Index Funds that Invest in Common Stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, at fair value | 0 | 61,471
Index Funds that Invest in Fixed Maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, at fair value | $ 64,673 | $ 54,648

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