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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax $ 118 $ 259 $ 1,311 $ 38,340
Income tax expense (benefit) (1,763) (7,438) (4,707) (3,399)
Unrealized Gains and Losses on Available for Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax 118 259 1,311 38,340
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, net of tax 94 194 1,060 31,156
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 118 259 1,311 12,135
Other than temporary impairment losses on investments 0 0 0 26,205
Total before tax 118 259 1,311 38,340
Income tax expense (benefit) $ (24) $ (65) $ (251) $ (7,184)