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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax expense (benefit) | $ (573) | $ 3,413
Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications, net of tax | 487 | 23,085
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 | 606 | 28,764
Income tax expense (benefit) | $ (119) | $ (5,679)

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