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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net realized gains (losses) on investments                 $ 63,352 $ (12,715) $ (2,089)
Income taxes                 (5,126) (17,003) (35,822)
NET INCOME $ (17,675) $ (3,169) $ 19,882 $ 20,067 $ (51,073) $ 20,146 $ 37,293 $ 40,148 19,105 46,514 117,051
Net changes related to available-for-sale securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net realized gains (losses) on investments                 56,914 492 (2,803)
Income taxes                 (13,605) (121) 694
NET INCOME                 $ 43,309 $ 371 $ (2,109)