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Investments - Summary of Sales of Available-for-sale Fixed-Maturity Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds |  |  | $ 79,284 | $ 5,225
Fixed-Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds | $ 1,098 | $ 2,240 | 79,284 | 5,225
Gross Realized Gains | 13 | 27 | 1,743 | 61
Gross Realized Losses | $ (34) | $ (1) | $ (610) | $ (2)

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