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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Income tax at federal statutory rate | $ 19,537 | $ 20,864 | $ 14,676
Stock compensation | (581) | (227) |
Qualified Production Activity Deduction | (1,715) | (1,776) | (1,347)
Other permanent items | 197 | (92) | (69)
Change in valuation allowance | 285 | 442 | 467
Change in uncertain tax positions | (1,807) | 66 | (559)
State income taxes, net of federal benefit | 2,150 | 1,897 | 2,245
Rate impact of the Tax Act | (3,386) |  |
Total tax expense | $ 14,680 | $ 21,174 | $ 15,413
Income tax at federal statutory rate | 35.00% | 35.00% | 35.00%
Stock compensation | (1.00%) | (0.40%) | (0.00%)
Qualified Production Activity Deduction | (3.10%) | (3.00%) | (3.20%)
Other permanent items | 0.40% | (0.10%) | (0.20%)
Change in valuation allowance | 0.50% | 0.70% | 1.10%
Change in uncertain tax positions | (3.20%) | 0.10% | (1.30%)
State income taxes, net of federal benefit | 3.80% | 3.20% | 5.40%
Rate impact of the Tax Act | (6.10%) |  |
Total tax expense | 26.30% | 35.50% | 36.80%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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