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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
REVENUES |  |  |  |  |  |  |  |  |  |  |  |
Net investment income | $ 10,448 | $ 6,074 | $ 5,221 | $ 4,042 | $ 3,894 | $ 2,797 | $ 2,858 | $ 2,986 |  | $ 25,785 | $ 12,535 | $ 20,393
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | $ 56,400 | 348 | 5,892 | 63,352
Net change in unrealized gains (losses) of equity securities |  |  |  |  |  |  |  |  |  | (13,145) | (4,032) | 25
Other revenue |  |  |  |  |  |  |  |  |  | 7,694 | 7,631 | 8,501
Total revenues | 330,360 | 312,810 | 292,006 | 287,482 | 292,659 | 287,254 | 279,181 | 262,757 |  | 1,222,658 | 1,121,851 | 1,072,770
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  |  | 304,897 | 313,595 | 289,634
Total operating costs and expenses | 295,881 | 404,417 | 279,595 | 263,403 | 356,566 | 260,761 | 249,087 | 226,386 |  | 1,243,296 | 1,092,800 | 1,048,444
Interest and amortization of debt issuance costs |  |  |  |  |  |  |  |  |  | 6,609 | 638 | 95
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (4,990) | 8,006 | 5,126
NET INCOME (LOSS) | $ 25,111 | $ (72,275) | $ 7,370 | $ 17,537 | $ (48,125) | $ 20,183 | $ 21,941 | $ 26,408 |  | (22,257) | 20,407 | 19,105
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
REVENUES |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | 930 | 2 | 273
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  |  | 1,462 | 405 | 38
Net change in unrealized gains (losses) of equity securities |  |  |  |  |  |  |  |  |  | (518) | 0 | 0
Management fee |  |  |  |  |  |  |  |  |  | 123 | 137 | 166
Interest income on intercompany note receivable |  |  |  |  |  |  |  |  |  | 9,686 | 415 | 0
Other revenue |  |  |  |  |  |  |  |  |  | 1 | 0 | 16
Total revenues |  |  |  |  |  |  |  |  |  | 11,684 | 959 | 493
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  |  | 12,223 | 10,552 | 15,448
Total operating costs and expenses |  |  |  |  |  |  |  |  |  | 12,223 | 10,552 | 15,448
Interest and amortization of debt issuance costs |  |  |  |  |  |  |  |  |  | 6,437 | 525 | 0
LOSS BEFORE INCOME TAX EXPENSE (BENEFIT) AND EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES |  |  |  |  |  |  |  |  |  | (6,976) | (10,118) | (14,955)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (670) | (2,800) | (215)
LOSS BEFORE EQUITY IN NET EARNINGS (LOSS) OF SUBSIDIARIES |  |  |  |  |  |  |  |  |  | (6,306) | (7,318) | (14,740)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  |  | (15,951) | 27,712 | 33,828
NET INCOME (LOSS) |  |  |  |  |  |  |  |  |  | $ (22,257) | $ 20,394 | $ 19,088

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