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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income tax expense (benefit) | $ 2,821 | $ 3,449 | $ (8,105)
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications, net of tax | 32,253 | (278) |
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 | 39,610 | (342) |
Income tax expense (benefit) | $ (7,357) | $ 64 |

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