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Income Taxes - Reconciliation of Effective Tax Rate on Net Income (Loss) and Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income tax at federal statutory rate | $ 15,159 | $ 19,537 | $ 20,864
Stock compensation | (436) | (581) | (227)
Qualified Production Activity Deduction |  | (1,715) | (1,776)
Other permanent items | (667) | 197 | (92)
Change in valuation allowance | 312 | 285 | 442
Change in uncertain tax positions | 969 | (1,807) | 66
State income taxes, net of federal benefit | 2,911 | 2,150 | 1,897
Rate impact of the Tax Act | (810) | (3,386) |
Total tax expense | $ 17,438 | $ 14,680 | $ 21,174
Income tax at federal statutory rate | 21.00% | 35.00% | 35.00%
Stock compensation | (0.60%) | (1.00%) | (0.40%)
Qualified Production Activity Deduction | (0.00%) | (3.10%) | (3.00%)
Other permanent items | (0.80%) | 0.40% | (0.10%)
Change in valuation allowance | 0.40% | 0.50% | 0.70%
Change in uncertain tax positions | 1.30% | (3.20%) | 0.10%
State income taxes, net of federal benefit | 4.00% | 3.80% | 3.20%
Rate impact of the Tax Act | (1.10%) | (6.10%) |
Total tax expense | 24.20% | 26.30% | 35.50%

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