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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Income (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
PREMIUMS EARNED AND OTHER REVENUES |  |  |  |  |  |  |  |  |  |  |
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
Net realized gains (losses) on investments |  | 53,800 |  |  |  |  |  |  | 63,352 | (12,715) | (2,089)
Net change in unrealized gains (losses) of equity securities |  |  |  |  |  |  |  |  | 25 | 23,188 | (17,169)
Other revenue |  |  |  |  |  |  |  |  | 8,501 | 7,972 | 7,163
Total premiums earned and other revenues | 273,126 | 311,665 | 252,704 | 235,275 | 239,402 | 229,641 | 233,722 | 236,586 | 1,072,770 | 939,351 | 823,816
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 289,729 | 272,428 | 256,488
Total operating costs and expenses | 300,125 | 315,457 | 225,266 | 207,691 | 308,455 | 201,745 | 182,792 | 182,842 | 1,048,539 | 875,834 | 670,943
Benefit from income taxes |  |  |  |  |  |  |  |  | 5,126 | 17,003 | 35,822
NET INCOME | $ (17,675) | $ (3,169) | $ 19,882 | $ 20,067 | $ (51,073) | $ 20,146 | $ 37,293 | $ 40,148 | 19,105 | 46,514 | 117,051
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
PREMIUMS EARNED AND OTHER REVENUES |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 273 | 2,249 | 1,635
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | 38 | (1,908) | 0
Net change in unrealized gains (losses) of equity securities |  |  |  |  |  |  |  |  | 0 | 3,186 | (2,648)
Management fee |  |  |  |  |  |  |  |  | 166 | 166 | 157
Other revenue |  |  |  |  |  |  |  |  | 16 | 10 | 0
Total premiums earned and other revenues |  |  |  |  |  |  |  |  | 493 | 3,703 | (856)
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 15,448 | 21,526 | 32,063
Total operating costs and expenses |  |  |  |  |  |  |  |  | 15,448 | 21,526 | 32,063
LOSS BEFORE INCOME TAXES AND EQUITY IN NET EARNINGS OF SUBSIDIARIES |  |  |  |  |  |  |  |  | (14,955) | (17,823) | (32,919)
Benefit from income taxes |  |  |  |  |  |  |  |  | (215) | (2,984) | (10,434)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES |  |  |  |  |  |  |  |  | (14,740) | (14,839) | (22,485)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 33,828 | 61,336 | 139,987
NET INCOME |  |  |  |  |  |  |  |  | $ 19,088 | $ 46,497 | $ 117,502

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