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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
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income | $ 7,228 | $ 7,063 | $ 7,324 | $ 7,749 | $ 8,035 | $ 8,264 | $ 8,169 | $ 8,015 | $ 29,364 | $ 32,483 | $ 30,452
Net unrealized gains (losses) on equity securities | 6,553 | 844 | 5,570 | (8,763) | 1,593 | 365 | 642 | 2,158 | 4,204 | 4,758 | (2,088)
Fee and other income |  |  |  |  |  |  |  |  | 350 | 321 | 599
Total revenues | 88,221 | 83,005 | 89,082 | 79,169 | 91,939 | 91,488 | 91,753 | 95,190 | 339,477 | 370,370 | 377,753
Expenses |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | 232,558 | 254,853 | 290,172
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 20,317 | 22,827 | 15,949
Net income | $ 28,501 | $ 23,353 | $ 23,948 | $ 10,800 | $ 34,014 | $ 21,386 | $ 17,890 | $ 19,400 | 86,602 | 92,690 | 71,632
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 944 | 915 | 1,089
Net unrealized gains (losses) on equity securities |  |  |  |  |  |  |  |  | (276) | 1,977 | (948)
Fee and other income |  |  |  |  |  |  |  |  | 9,122 | 5,352 | 7,389
Total revenues |  |  |  |  |  |  |  |  | 9,790 | 8,244 | 7,530
Expenses |  |  |  |  |  |  |  |  |  |  |
Other operating costs |  |  |  |  |  |  |  |  | 9,122 | 8,244 | 7,530
Total expenses |  |  |  |  |  |  |  |  | 9,122 | 8,244 | 7,530
Income before income taxes and equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 668 |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 259 | 376 | (36)
Gain (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 409 | (376) | 36
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 86,193 | 93,066 | 71,596
Net income |  |  |  |  |  |  |  |  | $ 86,602 | $ 92,690 | $ 71,632

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