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Income Taxes - Reconciliation of Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income taxes computed at the federal statutory rate, Value | $ 2,653 | $ 3,196 | $ 1,977
State income taxes, net of federal tax benefit, Value | 602 | 404 | 387
Excess tax benefits from stock options/restricted shares | (920) | (9) | (93)
Estimated charge for U.S. tax reform |  |  | 251
Charge for global intangible low-taxed income ("GILTI") | (20) | 69 |
Difference in tax rate on foreign earnings/other | 285 | 407 | 201
Change in valuation allowance | 172 | 7 |
Total provision for income taxes | $ 2,772 | $ 4,074 | $ 2,723
Income taxes computed at the federal statutory rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal tax benefit | 4.70% | 2.70% | 4.10%
Excess tax benefit from stock options/restricted shares | (7.30%) | (0.10%) | (1.00%)
Estimated charge for U.S. tax reform |  |  | 2.70%
Charge for global intangible low-taxed income ("GILTI") [Rate] | (0.20%) | 0.50% |
Difference in income tax rate on foreign earnings/other | 2.30% | 2.70% | 2.10%
Change in valuation allowance[Percent] | 1.40% |  |
Effective for income tax rate, Total | 21.90% | 26.80% | 28.90%

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