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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Amount      
Income tax at federal statutory rate $ 27,547 $ 19,447 $ 15,159
Stock compensation 331 (255) (436)
Other permanent items 424 737 (667)
Change in valuation allowance (207) 276 312
Change in uncertain tax positions 65 67 969
State income taxes, net of federal benefit 5,778 4,174 2,911
Rate impact of the Tax Act 0 0 (810)
Total tax expense $ 33,938 $ 24,446 $ 17,438
Percent      
Income tax at federal statutory rate 21.00% 21.00% 21.00%
Stock compensation 0.30% (0.30%) (0.60%)
Other permanent items 0.30% 0.80% (0.80%)
Change in valuation allowance (0.20%) 0.30% 0.40%
Change in uncertain tax positions 0.10% 0.10% 1.30%
State income taxes, net of federal benefit 4.40% 4.50% 4.00%
Rate impact of the Tax Act 0.00% 0.00% (1.10%)
Total tax expense 25.90% 26.40% 24.20%