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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)