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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
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax at federal statutory rate | $ 19,447 | $ 15,159 | $ 19,537
Stock compensation | (255) | (436) | (581)
Qualified Production Activity Deduction |  |  | (1,715)
Other permanent items | 737 | (667) | 197
Change in valuation allowance | 276 | 312 | 285
Change in uncertain tax positions | 67 | 969 | (1,807)
State income taxes, net of federal benefit | 4,174 | 2,911 | 2,150
Rate impact of the Tax Act |  | (810) | (3,386)
Total tax expense | $ 24,446 | $ 17,438 | $ 14,680
Income tax at federal statutory rate | 21.00% | 21.00% | 35.00%
Stock compensation | (0.30%) | (0.60%) | (1.00%)
Qualified Production Activity Deduction | (0.00%) | (0.00%) | (3.10%)
Other permanent items | 0.80% | (0.80%) | 0.40%
Change in valuation allowance | 0.30% | 0.40% | 0.50%
Change in uncertain tax positions | 0.10% | 1.30% | (3.20%)
State income taxes, net of federal benefit | 4.50% | 4.00% | 3.80%
Rate impact of the Tax Act | 0.00% | (1.10%) | (6.10%)
Total tax expense | 26.40% | 24.20% | 26.30%

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