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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, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Reserves for Unpaid Losses and LAE | $ 346,216 |  |  |  | $ 322,465 |  |  |  | $ 346,216 | $ 322,465 | $ 267,760 | $ 472,829
Incurred Loss and LAE Current Year |  |  |  |  |  |  |  |  | 724,768 | 700,473 | 515,338 |
Incurred (recovered) related to prior years |  |  |  |  |  |  |  |  | 54,437 | 58,337 | 88,068 |
Paid Losses and LAE |  |  |  |  |  |  |  |  | 751,792 | 700,406 | 538,331 |
Net investment income | 3,894 | $ 2,797 | $ 2,858 | $ 2,986 | 2,823 | $ 4,557 | $ 6,179 | $ 6,834 | 12,535 | 20,393 | 30,743 |
Deferred Policy Acquisition Cost (“DPAC”) | 108,822 |  |  |  | 110,614 |  |  |  | 108,822 | 110,614 | 91,882 | $ 84,686
Amortization of DPAC, Net |  |  |  |  |  |  |  |  | (224,121) | (199,154) | (176,843) |
Net Premiums Written |  |  |  |  |  |  |  |  | 1,084,827 | 1,004,903 | 869,645 |
Net Premiums Earned | 271,332 | $ 264,654 | $ 256,172 | $ 243,305 | 242,173 | $ 234,191 | $ 226,370 | $ 220,829 | 1,035,463 | 923,563 | 842,502 |
Unearned premiums | $ 857,769 |  |  |  | $ 783,135 |  |  |  | $ 857,769 | $ 783,135 | $ 661,279 |

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