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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized investment (gains) losses $ (7,323) $ 2,690 $ 22,332 $ (13,187)
Total before tax 18,379 (6,404) 30,370 (46,147)
Income tax expense (benefit) (3,209) (317) (8,173) 5,163
Net income (loss) 15,170 (6,721) 22,197 (40,984)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, net of tax (2,104) (847) (13,205) (2,665)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available for Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized investment (gains) losses (2,276) (946) (17,028) (4,731)
Other than temporary impairment losses on investments 0 0 0 1,897
Total before tax (2,276) (946) (17,028) (2,834)
Income tax expense (benefit) 172 99 3,823 169
Net income (loss) (2,104) (847) (13,205) (2,665)
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Items        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other net realized investment (gains) losses 0 0 0 0
Income tax expense (benefit) 0 0 0 0
Net income (loss) $ 0 $ 0 $ 0 $ 0