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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax $ 587 $ 9,317 $ 1,193 $ 38,081
Income tax expense (benefit) (2,371) 626 (2,944) 4,039
Unrealized Gains and Losses on Available for Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax 587 9,317 1,193 38,081
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, net of tax 479 7,877 966 30,962
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 587 8,637 1,193 11,876
Other than temporary impairment losses on investments 0 680 0 26,205
Total before tax 587 9,317 1,193 38,081
Income tax expense (benefit) $ (108) $ (1,440) $ (227) $ (7,119)