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Comprehensive Income and Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive 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
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments | $ (332) | $ 309 | $ 163 | $ 992 | $ (53) | $ (4) | $ (82) | $ 59 | $ 1,132 | $ (80) | $ (1,536)
Income before income taxes | 35,618 | 28,669 | 29,391 | 13,241 | 42,926 | 26,613 | 22,169 | 23,809 | 106,919 | 115,517 | 87,581
Income tax expense |  |  |  |  |  |  |  |  | (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
Unrealized Gains (losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | 925 | (841) | (390)
Income before income taxes |  |  |  |  |  |  |  |  | 925 | (841) | (390)
Income tax expense |  |  |  |  |  |  |  |  | (195) | 177 | 82
Net income |  |  |  |  |  |  |  |  | $ 730 | $ (664) | $ (308)

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