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Deferred Policy Acquisition Costs - Schedule of Major Categories of the Deferred Policy Acquisition Costs (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Deferred Charges Insurers [Abstract] |  |  |  |
Agents’ commissions | $ 13,244 | $ 14,290 |  |
Premium taxes | 2,806 | 2,960 |  |
Deferred underwriting expenses | 1,760 | 1,798 |  |
Total deferred policy acquisition costs | $ 17,810 | $ 19,048 | $ 19,734 | $ 20,251

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