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Other Comprehensive Income (Loss) - Reclassifications Adjustment for Gains (Losses) Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Net realized gains (losses) on investments $ 53,827     $ (22)     $ 54,294 $ (13,152)
Income taxes 623     (7,750)     (14,450) (34,983)
NET INCOME (LOSS) (3,169) $ 19,882 $ 20,067 20,146 $ 37,293 $ 40,148 36,780 97,587
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Net realized gains (losses) on investments 53,827     (22)     54,294 87
Income taxes (13,247)     6     (13,362) (21)
NET INCOME (LOSS) $ 40,580     $ (16)     $ 40,932 $ 66