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Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Reserves for Unpaid Losses and LAE | $ 510,117 |  |  |  | $ 1,038,790 |  |  |  | $ 510,117 | $ 1,038,790 | $ 346,216 | $ 322,465
Incurred Loss and LAE Current Year |  |  |  |  |  |  |  |  | 882,064 | 913,419 | 724,755 |
Incurred Loss and LAE Prior Years |  |  |  |  |  |  |  |  | 110,573 | 24,980 | 54,450 |
Paid Losses and LAE |  |  |  |  |  |  |  |  | 906,064 | 928,645 | 751,792 |
Net investment income | 13,714 | $ 12,755 | $ 11,282 | $ 10,698 | 10,448 | $ 6,074 | $ 5,221 | $ 4,042 | 48,449 | 25,785 | 12,535 |
Deferred Policy Acquisition Cost (“DPAC”) | 109,985 |  |  |  | 103,654 |  |  |  | 109,985 | 103,654 | 108,822 | $ 110,614
Amortization of DPAC, Net |  |  |  |  |  |  |  |  | (210,955) | (217,235) | (224,121) |
Net Premiums Written |  |  |  |  |  |  |  |  | 1,344,813 | 1,173,278 | 1,084,827 |
Net Premiums Earned | 335,398 | $ 331,040 | $ 303,274 | $ 282,224 | 291,870 | $ 290,631 | $ 277,061 | $ 269,064 | 1,251,936 | 1,128,626 | 1,035,463 |
Unearned premiums | $ 990,559 |  |  |  | $ 943,854 |  |  |  | $ 990,559 | $ 943,854 | $ 857,769 |

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