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Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets: |  |
Unearned premiums | $ 19,916 | $ 26,861
Advanced premiums | 1,275 | 1,314
Unpaid losses and LAE | 385 | 374
Share-based compensation | 3,894 | 3,256
Accrued wages | 288 | 297
Allowance for uncollectible receivables | 224 | 284
Additional tax basis of securities | 33 | 51
Capital loss carryforwards | 822 | 759
Other comprehensive income | 2,544 | 3,982
Other | 84 | 131
Total deferred income tax assets | 29,465 | 37,309
Valuation allowance | (523) | (133)
Deferred income tax assets, net of valuation allowance | 28,942 | 37,176
Deferred income tax liabilities: |  |
Deferred policy acquisition costs, net | (18,205) | (24,812)
Prepaid expenses | (435) | (504)
Fixed assets | (881) | (880)
Other | (135) | (306)
Total deferred income tax liabilities | (19,656) | (26,502)
Net deferred income tax asset | $ 9,286 | $ 10,674

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