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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Reserves for Unpaid Losses and LAE | $ 322,465 |  |  |  | $ 267,760 |  |  |  | $ 322,465 | $ 267,760 | $ 472,829 | $ 248,425
Incurred Loss and LAE Current Year |  |  |  |  |  |  |  |  | 700,473 | 515,338 | 314,933 |
Incurred (recovered) related to prior years |  |  |  |  |  |  |  |  | 58,337 | 88,068 | 99,522 |
Paid Losses and LAE |  |  |  |  |  |  |  |  | 700,406 | 538,331 | 401,011 |
Net investment income | 2,823 | $ 4,557 | $ 6,179 | $ 6,834 | 7,578 | $ 7,613 | $ 7,410 | $ 8,142 | 20,393 | 30,743 | 24,816 |
Deferred Policy Acquisition Cost (“DPAC”) | 110,614 |  |  |  | 91,882 |  |  |  | 110,614 | 91,882 | 84,686 | $ 73,059
Amortization of DPAC, Net |  |  |  |  |  |  |  |  | (199,154) | (176,843) | (163,187) |
Net Premiums Written |  |  |  |  |  |  |  |  | 1,004,903 | 869,645 | 827,674 |
Net Premiums Earned | 242,173 | $ 234,191 | $ 226,370 | $ 220,829 | 215,819 | $ 206,599 | $ 210,357 | $ 209,727 | 923,563 | 842,502 | 768,382 |
Unearned premiums | $ 783,135 |  |  |  | $ 661,279 |  |  |  | $ 783,135 | $ 661,279 | $ 601,679 |

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